Solution: Only a few living creatures can use nitrogen in the form of N2, which is plentiful in the air. Only a few bacterial species have the ability to fix nitrogen. Nitrogenase, a nitrogen...
Mycorrhiza is a mutualistic association. How do the organisms involved in this association benefit from each other?
Solution: A fungus and the roots of a vascular plant form a symbiotic relationship known as mycorrhiza. The plant absorbs phosphate and other minerals from the soil by mycorrhization, including zinc...
Name a plant, which accumulates silicon.
Solution: Silicon is abundant in the soil, but it is taken up by the flowers in the form of mono-silicic acid. When plants are under stress, silicon appears to help them. It has been shown to boost...
Plants can be grown in (Tick the incorrect option)
a. soil with essential nutrients.
b. water with essential nutrients.
c. either water or soil with essential nutrients.
d. water or soil without essential nutrients
Solution: Plants can be cultivated in soil, water, or both with the addition of vital nutrients. It cannot, however, develop in nutrient-deficient water or soil. So, the correct answer is 'water or...
Match the element with its associated functions/roles and choose the correct option among given below
A. Boroni. splitting of H2O to liberate O2 during photosynthesisB. Manganeseii. needed for the synthesis of auxinsC. Molybdenumiii. component of nitrogenase D. Zinc E. Ironiv. Pollen germination v....
With regard to the Biological Nitrogen Fixation by Rhizobium in association with soybean, which one of the following statement/ statements do not hold.
a. Nitrogenase may require oxygen for its functioning.
b. Nitrogenase is MO- Fe protein
c. Leg-haemoglobin is a pink coloured pigment.
d. Nitrogenase helps to convert N2 gas into two molecules of ammonia.
Solution: Nitrogenase is an enzyme that does not require oxygen to function. All nitrogen-fixing bacteria, on the other hand, have a specific structure called heterocysts that generate an anaerobic...
Which one of the following symptoms is not due to manganese toxicity in plants?
a. Calcium translocation in shoot apex is inhibited
b. Deficiency in both Iron and Nitrogen is induced
c. The appearance of brown spot surrounded by chlorotic veins
d. None of the above
Solution: Due to an induced iron deficit, manganese toxicity commonly causes chlorosis (pale or yellow color), which is most severe on the younger leaves. In crops afflicted by manganese poisoning,...
Deficiency symptoms of an element tend to appear first in young leaves. It indicates that the element is relatively immobile. Which one of the following elemental deficiency would show such symptoms?
a. sulphur
b. magnesium
c. nitrogen
d. potassium
Solution: Symptoms of an element deficiency usually occur first in young leaves. It suggests that sulfur is a relatively stationary element. Option (a) is the answer. So, the correct answer is...
Which one of the following statements can best explain the term critical concentration of an essential element?
a. essential element concentration below which plant growth disregarded.
b. essential element concentration below which plant growth becomes stunted.
c. essential element concentration above which plant remains in the vegetative phase.
d. none of the above
Solution: The phrase "critical concentration" is used to describe the concentration of vital components below which plant growth is slowed or halted. In addition, if the concentrations of vital...
Which one of the following roles is not characteristic of an essential element?
a. is a component of biomolecules
b. changing the chemistry of soil
c. being a structural component of energy-related chemical compounds
d. activation or inhibition of enzymes
Solution: It is easier to change a dirt's fruitfulness, which is a significant property than it is to change the dirt's physical features. The presence of dirt minerals, as well as seepage...
An organism has two pair of chromosomes (i.e., chromosome number = 4). Diagrammatically represent the chromosomal arrangement during different phases of meiosis-II.
Solution: Cell division and cell cycle are two separate processes that occur in your body. Cell division is the process of two daughter cells multiplying from a single parent cell. Eukaryotic cells...
Write briefly the significance of mitosis and meiosis in a multicellular organism.
Solution: Mitosis and Its Importance: Mitosis helps a single-cell zygote develop into a fully formed creature. It aids an organism's development.It aids in the healing of worn or injured tissues.It...
Write a brief note on the following
a. Synaptonemal complex
b. Metaphase plate
Solution: Following is the description of each of the given topics- a. Synaptonemal complex- It is made up of protein that is generated when two homologous chromosomes come together. The complex...
Differentiate between the events of mitosis and meiosis.
Solution: The difference between Mitosis and Meiosis are- MitosisMeiosis1. The prophase will be brief.1. Prophase I lasts a long time while prophase II lasts a short time.2. During metaphase, just...
What are the various stages of meiotic prophase-I? Enumerate the chromosomal events during each stage?
Solution: Prophase I –LeptoteneThe nuclear membrane begins to dissolve at the leptotene stage.The chromatin material begins to condense.Centriole reaches the poles in opposite...
Comment on the statement – Telophase is reverse of prophase.
Solution: Chromosomes condense during prophase. The nuclear membrane breaks down. Organelles such as mitochondria, the endoplasmic reticulum, and the Golgi apparatus vanish. Golgi complexes,...
How does cytokinesis in plant cells differ from that in animal cells?
Solution: The difference between cytokinesis of plant and animal cells is as follows- Cytokinesis in plant cellsCytokinesis in animal cellsCell plate development is responsible for cytoplasm...
Name a cell that is found arrested in diplotene stage for months and years. Comment in 2-3 lines how it completes the cell cycle?
Solution: In the diplotene stage, the oocyte of mammalian females are arrested. The oocyte develops into a secondary follicle before being stopped at the diplotene stage. The first meiosis is...
Comment on the statement – Meiosis enables the conservation of specific chromosome number of each species even though the process per se, results in a reduction of chromosome number.
Solution: When two haploid cells called gametes combine during fertilization, a diploid zygote is created. In the absence of meiosis, two diploid gametes are generated, resulting in the creation of...
10. Two key events take place, during S phase in animal cells, DNA replication and duplication of the centriole. In which parts of the cell do events occur?
Solution: During the S phase in animal cells the process of centriole duplication takes place in the cytoplasm, while DNA replication takes place in the nucleus.
Name the pathological condition when uncontrolled cell division occurs.
Solution: Tumor or cancer is a pathological condition caused by uncontrolled cell division and abnormal cell development. This is called malignancy caused due to cancer.
Both unicellular and multicellular organisms undergo mitosis. What are the differences, if any, observed in the process between the two?
Solution: Amitosis occurs in prokaryotes, where the cell divides into two daughter cells. In multicellular creatures, however, normal cell division procedures are followed: first, karyokinesis, then...
7. Mitosis results in producing two cells which are similar to each other. What would be the consequence if each of the following irregularities occur during mitosis?
a. Nuclear membrane fails to disintegrate
b. Duplication of DNA does not occur
c. Centromeres do not divide
d. Cytokinesis does not occur
Solution: (a) The spindle fibers would be unable to reach chromosomes if the nuclear membrane failed to dissolve. As a result, chromosomes would be unable to reach the cell's opposite poles. (b) If...
The following events occur during the various phases of the cell cycle, Name the phase against each of the events.
a. Disintegration of nuclear membrane_________________________
b. Appearance of nucleolus_________________________
c. Division of centromere_________________________
d. Replication of DNA _________________________
Solution: The following are the events and their phases. (a)Disintegration of nuclear membrane - Prophase. (b) Appearance of nucleolus -Telophase. (c) Division of centromere - Anaphase. (d) ...
While examining the mitotic stage in a tissue, one finds some cells with 16 chromosomes and some with 32 chromosomes. What possible reasons could you assign to this difference in chromosome number? Do you think cells with 16 chromosomes could have arisen from cells with 32 chromosomes or vice versa?
Solution: The most possible reason for this phenomenon is mosaicism. Mosaicism refers to the coexistence of two populations of cells with different genotypes in a single person. Mosaicism can occur...
A cell has 32 chromosomes. It undergoes mitotic division. What will be the chromosome number (N) during metaphase? What would be the DNA content (C) during anaphase?
Mitochondria and plastids have their DNA (genetic material). What is known about their fate during nuclear division like mitosis?
Solution: Extrachromosomal DNA is the DNA found in mitochondria and plastids. They are unaffected by nuclear DNA division in the nucleus. As a result, mitosis has no effect on extrachromosomal DNA.
State the role of centrioles other than spindle formation.
Solution: Apart from forming spindles, centrioles also serve as the foundation for cilia and flagella. Microtubules and the sperm tail are also formed with their assistance. Centriole forms the...
In which phase of meiosis is the following formed? Choose the answers from hint points given below.
a. Synaptonemal complex ____________________________
b. Recombination nodules ____________________________
c. Appearance/activation of ____________________________ enzyme recombinase
d. Termination of chiasmata _ ___________________________
e. Interkinesis ____________________________
f. Formation of dyad of cells _ ___________________________
Hints : 1) Zygotene, 2) Pachytene, 3) Pachytene, 4) Diakinesis, 5) After Telophase-I /before Meosis-II, 6) Telophase-I /After Meiosis-I.
Solution: During meiosis, a protein structure called the synaptonemal complex (SC) arises between homologous chromosomes (two pairs of sister chromatids) and is visible in the zygotene stage because...
It is observed that heart cells do not exhibit cell division. Such cells do not divide further and exit ___________ phase to enter an inactive stage called ___________ of cell cycle. Fill in the blanks.
Solution: It has been discovered that cardiac cells do not divide. Such cells do not divide further and exit the G1 phase of the cell cycle, entering the dormant G0 stage. So, the answers are the G1...
27. What is the significance of the time gap in the passage of action potential from the sino-atrial node to the ventricle
Solution - the time gap in the passage of action potential from the sino-atrial node to the ventricle provides ventricles to relax . Because of this ventricular pressure falls and this results in...
26. Explain the consequences of a situation in which blood does not coagulate
Solution - excessive bleeding would take place if the clotting of the blood does not takes place . It can also lead to death of the person
It is said that the one cycle of cell division in human cells (eukaryotic cells) takes 24 hours. Which phase of the cycle, do you think occupies the maximum part of the cell cycle?
Solution: Interphase is the phase of the cycle that takes 23 hours out of 24 hours. It's important to note that during a human cell's 24-hour average cell cycle, cell division lasts only...
25. What physiological circumstances lead to erythroblastosis foetal?
Solution – when there is Rh incompatibility between the mother and the fetus during pregnancy then the condition is termed as erythroblastosis fetal . It can also lead to death of the fetus or the...
At what stage of the cell cycle does DNA synthesis take place?
Solution: In this phase, DNA synthesis takes to occur. A cell must make a fresh copy of its chromosomes before it may divide. It takes both the replication of the lengthy DNA molecule in each...
24. State the functions of the following in blood
a. Fibrinogen b. Globulin c. Neutrophils d. Lymphocytes solution - a) fibrinogen : clotting of blood . globulin : facilitates immune responseneutrophils : at the occurrence of an infection...
An anther has 1200 pollen grains. How many pollen mother cells must have been there to produce them?
Solution: One Pollen Mother Cell (PMC) produces four haploid pollen grains during meiosis. Thus, 1200/4=300 PMCs are required to produce 1200 pollen grains. 1 pollen mother cell →4 pollen grain....
22. Which coronary artery disease is caused due to narrowing of the lumen of arteries?
Solution - the coronary artery disease caused by the narrowing of the lumen of arteries is known as atherosclerosis .
If the tissue has at a given time 1024 cells, how many cycles of mitosis had the original parental single-cell undergone?
Solution: Each cycle results in the formation of two daughter cells. The formula is (2 ^ number of cycles = number of daughter cells). Therefore, 2x=1024, which implies X=10. So, if we check...
21. Given below are the abnormal conditions related to blood circulation. Name the disorders.
a. Acute chest pain due to failure of O2 supply to heart muscles b. Increased systolic pressure solution – the related disorders are : angina pectoris – it is a chest pain due to reduced blood...
The diagram shows a bivalent at prophase-I of meiosis. Which of the four chromatids can cross over?
Solution: In this situation, non-sister chromatids can cross over. Crossing over always takes place between two non-sister chromatids and never between two sister chromatids. Sister chromatids of...
20. Name the vascular connection that exists between the digestive tract and liver.
Solution - Hepatic Portal System is the vascular connection that exists between the digestive tract and the liver .
19. Given below is the diagrammatic representation of a standard ECG. Label its different peaks.
solution - labelling of the diagram :
18. Complete the missing word in the statement given below:
a. Plasma without _________ factors is called serum. b. ___________ and monocytes are phagocytic cells. c. Eosinophils are associated with _____ reactions. d. _______ ions play a significant role in...
17. Name the blood component which is viscous and straw-coloured fluid .
Solution – plasma is the blood component which is viscous and straw-colored fluid .
16. Read the following statements and choose the correct option
Statement 1: Atria receive blood from all parts of the body which subsequently flows to ventricles. Statement 2: Action potential generated at the sino-atrial node passes from atria to ventricles....
15. Match the terms given under Column ‘A’ with their functions given under
Column ‘B’ and select the answer from the options given below: Column I Column II A. Lymphatic System B. Pulmonary vein C. Thrombocytes D. Lymphocytes iv.Column II i. Carries oxygenated blood ii....
14. What would be the cardiac output of a person having 72 heartbeats per per minute and a stroke volume of 50 ml ?
a. 360 mL b. 3600 mL c. 7200 mL d. 5000 mL correct option –( b ) explanation – the cardiac output of a person having 72 heartbeats per minute and a stroke volume of 50 ml will be 3600mL ....
13. Which of the following statements is incorrect?
a. A person of ‘O’ blood group has anti ‘A’ and anti ‘B’ antibodies in his blood plasma. b. A person of ‘B’ blood group can’t donate blood to a person of ‘A’ blood group. c. Blood group is...
12. Which of the following correctly explains a phase/ event in the cardiac cycle
in a standard electrocardiogram? a. QRS complex indicates atrial contraction. b. QRS complex indicates ventricular contraction. c. The time between S and T represents atrial systole. d. P-wave...
11. The second heart sound (dubb) is associated with the closure of
a. Tricuspid valve b. Semilunar valves c. Bicuspid valved. d.Tricuspid and bicuspid valves correct option – ( b ) explanation – different sounds are produced bt closure of different valves . The...
10. The cells involved in inflammatory reactions are
a. Basophils b. Neutrophils c. Eosinophils d. Lymphocytes correct option –( d ) explanation – lymphocytes are involved in inflammatory reactions . They play a key role in chronic inflammatory...
9. The cardiac impulse is initiated and conducted further up to ventricle.
The correct sequence of conduction of impulse is a. S A Node A V Node Purkinje fibre A V Bundle b. S A Node Purkinje fibre A V Node A V Bundle c. S A Node A V Node A V Bundle Purkinje fibre d. S A...
8. Which one of the following blood cells are involved in antibody production?
a. B-Lymphocytes b. T-Lymphocytes c. RBC d. Neutrophils correct option –( a ) explanation – each B cell produces a single specie of antibody . T lymphocytes kill the infected cells . RBC carries...
What attributes does a chromatid require to be classified as a chromosome?
Solution: To be recognized as a chromosome, there must be two identical sister chromatids linked at the centromere's center. So, when chromatids are attached to the centromere it is termed as a...
Which part of the human body should one use to demonstrate stages in mitosis?
Solution: Human skin cells, hair follicles, and intestinal epithelial cells are constantly dividing, and hence stages of mitosis can be detected. So, the tissues near the cheeks can be taken to...
Given that the average duplication time of Escherichia coli is 20 minutes, how much time will two Escherichia coli cells take to become 32 cells?
Solution: To create 32 cells, Escherichia coli cells must go through 5 division cycles, resulting in ${{2}^{5}}=32$ cells. 1→ 2 →4 →8 →16 →32 cells. Each cycle takes 20 minutes to...
Which tissue of animals and plants exhibits meiosis?
Solution: To produce gametes, germ cells in the reproductive tract goes through a process called meiosis. Only the reproductive cells or germ cells (gametes) of the organism undergo meiosis,...
Name a stain commonly used to colour chromosomes.
Solution: The cell is stained with Acetocarmine and mounted in acetocarmine alone and Giemsa to make the chromosomes visible.
Which of the phases of the cell cycle is of longest duration?
Solution: The G1 phase is the longest in the cell cycle. It's the beginning of the interphase. The cell prepares for division during the G1 phase. During the G1 phase, cells are extremely...
Between a prokaryote and a eukaryote, which cell has a shorter cell division time?
Solution: Cell division in prokaryotic cells is faster than in eukaryotic cells. Human cells in culture demonstrate a typical eukaryotic cell cycle. These cells divide once every 24 hours on...
Select the correct statement about G1 phase
a. The cell is metabolically inactive
b. DNA in the cell does not replicate
c. It is not a phase of synthesis of macromolecules
d. Cell stops growing
Solution: G 1 is the metabolically active stage of the cell cycle's interphase. The synthesis of ATP nucleotides, amino acids, RNAs, and proteins takes place during G 1, and the nucleus grows. In...
Identify the wrong statement about meiosis
a. The pairing of homologous chromosomes
b. Four haploid cells are formed
c. At the end of meiosis, the number of chromosomes is reduced to half
d. Two-cycle of DNA replication occurs
Solution: Meiosis is a type of cell division in which the number of chromosomes is cut in half, resulting in four haploid cells. DNA replication is followed by two rounds of cell division in...
7. Which one of the following types of cells lacks nucleus in humans?
a. Erythrocytes b. Neutrophils c. Eosinophils d. Monocytes correct option –( a ) explanation – erythrocytes or red blood cells lack nucleus in humans . they contain hemoglobin hence correct answer...
Which of the events listed below is not observed during mitosis?
a. Chromatin condensation
b. Movement of centrioles to opposite poles
c. The appearance of chromosomes with two chromatids joined together at the centromere.
d. Crossing over
Solution: The parent cell's replicated chromosomes condense and become thousands of times more compact during prophase than they were during interphase. These structures now look like X-shaped...
6. ECG depicts the depolarisation and repolarisation processes during the cardiac cycle. In the ECG of a normal healthy individual one of the following waves is not represented.
a. Depolarisation of atria b. Repolarisation of atria c. Depolarisation of ventricles d. Repolarisation of ventricles correct option –( b ) explanation – different waves in ECG represents different...
5. Mark the pair of substances among the following which is essential for coagulation of blood.
a. Heparin and calcium ions b. Calcium ions and platelet factors c. Oxalates and citrates d. Platelet factors and heparin correct option –( b ) explanation – Calcium ions and platelet factors ...
Which of the events listed below is not observed during mitosis?
a. Chromatin condensation
b. Movement of centrioles to opposite poles
c. The appearance of chromosomes with two chromatids joined together at the centromere.
d. Crossing over
Solution: The parent cell's replicated chromosomes condense and become thousands of times more compact during prophase than they were during interphase. These structures now look like X-shaped...
4. The cardiac activity could be moderated by the autonomous neural system.
Tick the correct answer: a. The parasympathetic system stimulates the heart rate and stroke volume b. The sympathetic system stimulates the heart rate and stroke volume c. The parasympathetic system...
3. Which among the followings is correct during each cardiac cycle?
a. The volume of blood pumped out by the Rt and Lt ventricles is same. b. The volume of blood pumped out by the Rt and Lt ventricles is different c. The volume of blood received by each atrium is...
Cells which are not dividing are likely to be at
a. G1
b. G2
c. Go
d. S phase
Solution: Cells that do not divide further exit G 1 and enter the quiescent stage (G 0 ) of the cell cycle, which is an inactive state. Cells in this stage are still metabolically active, but they...
2. One of the common symptoms observed in people infected with Dengue fever is
a. Significant decrease in RBC count b. Significant decrease in WBC count c. Significant decrease in platelets count d. Significant increase in platelets count correct option –( c ) explanation –...
1. Which of the following cells does not exhibit phagocytosis activity?
a. Monocyte b. Neutrophil c. Basophil d. Macrophage correct option – ( c ) explanation – phagocytosis is the activity in which a living cell eats up other cells . Basophil does not show the activity...
A bivalent of meiosis-I consists of
a. Two chromatids and one centromere
b. Two chromatids and two centromere
c. Four chromatids and two centromere
d. Four chromatids and four centromere
Solution: The two homologous chromosomes that have been duplicated join, produce a bivalent. Tetrad is another name for it, and it is created mostly during the pachytene stage of...
Mitosis is characterised by
a. Reduction division
b. Equal division
c. Both reduction and equal division
d. Paining of homologous chromosomes
Solution: Mitosis is characterized by equal division since the number of chromosomes in the daughter cells remains the same as in the parent cell. Meiosis, on the other hand, is characterized by...
Meiosis occurs in organisms during
a. Sexual reproduction
b. Vegetative reproduction
c. Both sexual and vegetative reproduction
d. None of the above
Solution: The fusion of two gametes, each with a complete haploid set of chromosomes, is required for sexual reproduction to produce offspring. These gametes are made up of specialized diploid cells...
At which stage of meiosis does the genetic constitution of gametes is finally decided
a. Metaphase I
b. Anaphase II
c. Metaphase II
d. Anaphase I
Solution: Since chromosomes are separated in anaphase 1 and 2n from the parent becomes n in daughter cells, the genetic constitution of gametes is finally determined in the Anaphase 1 stage. So, the...
Meiosis results in diploid organisms
a. Production of gametes
b. Reduction in the number of chromosomes
c. Introduction of variation
d. all of the above
Solution: Meiosis is a cell division process that results in the halving of the number of chromosomes, resulting in the creation of gametes. In pachytene (prophase I, meiosis I), the crossing...
Comment on the experimental setup. What does the setup demonstrate?
b. What will happen to the level of water if a blower is placed close to setup?
c. Will the mercury level fluctuate (go up/down) if phenylmercuric acetate is sprayed on leaves?
Solution: a) The setup depicts the transpiration pull, which is the force that occurs when the water pulls upwards from the root to the leaves. b) If a blower is installed near the setup, it will...
Water molecule is very polar. Polar end of molecule attracts opposite charges on another water molecule (acts like a magnet). How will you explain this property of water with reference to the upward movement of water? Comment on the upward movement of water given the intermolecular hydrogen bonding in water.
Solution: The cohesion of the water molecules is the method through which water molecules remain linked to one another through hydrogen bonding. Water moves upward through xylem vessels, creating a...
The radiolabelled carbon in carbon dioxide supplied to potato plants in an experiment was seen in the tuber eventually. Trace the movement of the labelled carbon dioxide.
Solution: When the potato plant performs photosynthesis with radiolabelled CO2, it produces oxygen and glucose (C6H12O6), with the radiolabelled carbon present in the glucose molecule....
Halophytes may show cell pressure very much higher than atmospheric pressure. Explain how this can happen?
Solution: Their cell cytoplasm is hypertonic due to the greater salt concentration, allowing water from the surrounding cells or region to enter the cell cytoplasm. The cell will exert a greater...
Why are natural membranes selectively permeable. Give examples.
Solution: Natural membranes, such as the cell membrane, are selectively permeable, allowing only specific molecules to enter or exit the cell. A cell membrane is an example of a lipid bilayer that...
Plants show temporary and permanent wilting. Differentiate between the two. Do any of them indicate the water status of the soil?
Solution: Plants lose turgidity in temporary wilting when the rate of transpiration exceeds the rate of water absorption from the soil, while in permanent wilting, the plant wilts and is a permanent...
Minerals are present in the soil in sufficient amounts. Do plants need to adjust the types of solutes that reach the xylem? Which molecules help to adjust this? How do plants regulate the type and quantity of solutes that reach xylem?
Solution: Yes, the type and quantity of solutes that reach the xylem must be adjusted by plants. End dermal cell transport proteins aid in the maintenance and adjustment of solute transportation....
Define Uniport, Symport and Antiport. Do they require energy?
Solution: 1. Uniport: Uniport occurs when a single substance travels in a single direction through a cell membrane. 2. Antiport: Antiport occurs when two chemicals travel in opposite directions...
Observe the diagram and answer the following;
a. Are these types of guard cells found in monocots or dicots?
b. Which of these shows a higher water content (i) or (ii)?
c. Which element plays an important role in the opening and closing of stomata?
Solution: a) Because dicots have a bean-shaped morphology, these guard cells are seen in dicots. It's commonly dumble-shaped for monocots. b) Figure i) depicts a higher water content. c) Potassium...
Explain the mass flow hypothesis of transport in phloem
Solution: Munch presented the mass flow concept to explain sap circulation via the phloem in 1930. When the source (where the food is made) contains a high concentration of sugar, a diffusion...
What is the relationship between germinal layers and the formation of the body cavity in case of coelomate, acoelomates and pseudocoelomates?
•Germinal layers are those which formed during the process of gastrulation period .•The outer layer of germ is known ectoderm, the middle is endoderm and the innermost is the endoderm layer....
How is facilitated diffusion different from diffusion?
Solution: Diffusion Facilitated diffusion(i) Diffusion takes place along an osmotic gradient.(i) Movement is against the osmotic gradient during assisted diffusion. (ii) It is a...
Differentiate between diffusion and translocation in plants.
Solution: The transfer of chemicals from a location of higher concentration to a region of lower concentration is known as diffusion. The bulk transfer of material in solution inside plant channels...
We know that plants are harmed by excess water. But plants survive under flooded condition. How are they able to manage excess water?
Solution: Some rice types are able to withstand flooding. These rice cultivars have special characteristics that enable plants endure floods. In the event of a flood, the stems of these plants grow...
ABA (Abscisic acid) is called a stress hormone.
a. How does this hormone overcome stress conditions?
b. From where does this hormone gets released in leaves?
Solution: a) Abscisic acid is a stress hormone that causes changes such as the shutting of stomata to prevent further water loss during water scarcity, seed germination when conditions are favorable...
Comment upon the habitats and external features of animals belonging to class, amphibia and reptilia.
Amphibia •They are thin and have smooth skin which can live on both land and water. •Their eyes have eyelids and have a pair of limbs.•A tympanum is representing the ears. •Examples are Rana(frog)...
What are ‘aquaporins’? How does the presence of aquaporins affect osmosis?
Solution: Aquaporins are a type of membrane protein that forms channels in the membrane and aids in the transportation of water between cells. The presence of aquaporins would speed up osmosis and...
Mammals are most adapted among the vertebrates. Elaborate.
●Mammals are found in a variety of habitats such as deserts, plains and mountains.● They differ in the type of jaws and sexes are separate and fertilization is internal.●They have pairs of limbs...
Observe the figure and answer the question provided below the figure. Why does tube B show higher water rise than A?
Solution: Tube B has a higher water rise than tube A because the surface area of the narrow tube or tube B is less, resulting in a higher level of surface tension and hence a higher level of water...
What is the chemical composition of xylem and phloem sap?
Solution: The sap of the xylem is mostly made up of inorganic substances. The majority of Sulphur and Potassium is found in inorganic compounds. However, the majority of nitrogen is found in organic...
Salt is applied to tennis lawns to kill weeds. How does salting tennis lawns help in the killing of weeds without affecting the grass?
Solution: It is a common fallacy that salting just kills weeds and has no effect on grass. Because of osmosis, when salt is added to a plant, water from the plant cells leaks out. Excessive water...
Sugar crystals do not dissolve easily in ice-cold water. Explain
Solution: Water's kinetic energy decreases as the temperature drops. As a result, sugar crystals dissolve quickly in hot water. At room temperature, they will take a little longer to dissolve in...
When a freshly collected Spirogyra filament is kept in a 10% potassium nitrate solution, it is observed that the protoplasm shrinks in size:
a. What is this phenomenon called?
b. What will happen if the filament is replaced in distilled water?
Solution: a) Exosmosis is the name for this occurrence. b) If the filament is put in distilled water, the protoplasm becomes turgid again when water flows in and the shrunken protoplasm...
Keep some freshly cut flowers in a solution of food colour. Wait for some time for the dye to rise in the flower, when the stem of the flower is held up in light, coloured strands can be seen inside. Can this experiment demonstrate which tissue is conducting water up the stem?
Solution: This experiment can show which tissue is responsible for transporting water up the stem. The presence of colored strands indicates that the food color has been carried upwards through the...
Will the ascent of sap be possible without the cohesion and adhesion of the water molecules? Explain.
Solution: No, because these are the ones who are in charge of the same. The adhesive and cohesive properties of water maintain a continuous water column in the xylem vessels for sap ascent. Absence...
How can plants be grown under limited water supply without compromising on metabolic activities?
Solution: When a plant's water supply is limited, it adapts its physiology to conserve water. In xerophytes, for example, water loss is reduced by inhibiting transpiration. During the summer, even...
Various types of transport mechanisms are needed to fulfil the mineral requirements of a plant. Why are they not fulfilled by diffusion alone?
Solution: Plants also require mineral nutrients and charged ions such as potassium and sodium, which cannot be delivered by simple diffusion because the selectively permeable cell membrane does not...
In a girdled plant, when water is supplied to the leaves above the girdle, leaves may remain green for some time then wilt and ultimately die. What does it indicate?
Solution: When water is delivered to the leaves above the girdle of a girdled plant, the leaves may remain green for a period of time because leaves may synthesize their food through photosynthesis...
Cut pieces of beetroot do not leave colour in cold water but do so in hot water. Explain.
Solution: The leakage of the plasma membrane occurs when chopped beetroot pieces are maintained in hot water. Beetroot pigments are released into the water as a result, and the water becomes...
How are the intracellular levels of ions maintained higher than extracellular levels in animal cells?
Solution: Animal cells have ATP-powered pumps like the Na+- K+ pump where 3Na+ is sent out in exchange for 2 K+ ions thus increasing the level of K+ ions in the intracellular region. This is how via...
Water is indispensable for life. What properties of water make it useful for all biological processes on the earth?
a) Water is a polar solvent due to which it is regarded as the ‘universal solvent’.
b) Water has a high specific heat capacity.
c) Water has low viscosity and high surface tension.
d) The density of water decreases below 4◦C.
e) Capillarity of water
Solution: a) All living creatures' essential substances are solutes that are dissolved in water and transferred from one location to another. b) Specific heat is defined as the amount of energy...
Do different species of plants growing in the same area show the same rate of transpiration at a particular time? Justify your answer.
Solution; The number and distribution of stomata, the proportion of open stomata, water status, canopy shape, and other plant variables all influence the rate of transpiration. Different plant...
From your knowledge of physiology can you think of some method of increasing the life of cut plants in a vase?
Solution: Using cytokinins, a plant growth hormone that helps to delay senescence or the aging of plant tissues. To avoid water cavitation caused by air, immerse the cut stem in water in the vase.
If one wants to find minerals and in the form, they are mobilised in the plant, how will an analysis of the exudate help?
Solution: The identification of the forms and modes of mineral transport in plants was aided by an examination of xylem exudates. For example, an examination of xylem exudates found that the...
Minerals absorbed by the roots travel up the xylem. How do they reach the parts where they are needed most? Do all the parts of the plant get the same amount of the minerals?
Solution: Minerals are absorbed from the soil by the roots and transferred to various sections of the plant via the xylem vessels. Because various plants and plant parts have different mineral...
Correct the statements
a. Cells shrink in hypotonic solutions and swell in hypertonic solutions.
b. Imbibition is a special type of diffusion when water is absorbed by living cells.
c. Most of the water flow in the roots occurs via the symplast.
Solution: a) Hypertonic solutions cause cells to shrink, while hypotonic solutions cause them to swell. b) Imbibition is a type of diffusion in which water is absorbed by living or dead cells. c)...
Identify a type of molecular movement which is highly selective and requires special membrane proteins, but does not require energy.
Solution: Facilitated diffusion is a sort of molecular movement that is very selective and requires particular membrane proteins but does not require energy. Any substance's solubility in lipid...
A gardener forgot to water a potted plant for a day during summer, what will happen to the plant? Do you think it is reversible? If yes, how?
Solution: During the heat, if a potted plant is not watered for a day, it will wilt. This occurs as a result of excessive water loss through transpiration. In the majority of cases, this can be...
Describe briefly the three physical properties of water which helps in the ascent of water in the xylem.
Solution: i) The attraction between water molecules and other molecules is known as adhesion. ii) Cohesion is the force that keeps water molecules connected together through hydrogen bonding between...
Transpiration is a necessary evil in plants. Explain.
Solution: Transpiration is the process through which plants lose water from their aerial portions in the form of water vapour. When there is a large amount of transpiration, there is a large amount...
Differentiate between guttation and transpiration.
Solution: Guttation is the loss of water from the margins of leaves in the form of water droplets, whereas transpiration is the loss of water from the plant's aerial portions in the form of water...
Give the location of the Casparian strip and explain its role in the water movement.
Solution: Casparian strips are found in the radial and transverse endodermal cell walls of plant roots. It inhibits water from moving from the pericycle to the cortex, generating and maintaining a...
How does water moves within the root?
Solution: Osmosis is the process through which water flows from the soil to the roots. The soil has a higher water potential than the cytoplasm of the root hair. As a result, osmosis allows water to...
Differentiate between Apoplast and Symplast pathways of water movement. Which of these would need active transport?
Solution: 1. Apoplast is made up of non-living plant parts, whereas symplast is made up of living plant parts. 2. Passive diffusion occurs in the apoplast, whereas osmosis occurs in the symplast. 3....
Tradescantia leaf epidermal peel was taken and
a. Placed in the salt solution for five minutes.
b. After that, it was placed in distilled water. When seen under the microscope what would be observed in a and b?
Solution: a. The cells would have shrunk under the microscope because the salt solution is hypertonic, forcing water to flow out of the cell and exosmosis to occur. b. After that, the cell regains...
Why is solute potential always negative? Explain
Solution: Because the concentration of water in a solution is lower than that of pure water, when a solute is dissolved in water, the water potential is reduced. Solute potential is a metric for...
Define water potential and solute potential.
Solution: Water potential (${{\psi }_{w}}$) is the sum of solute potential (${{\psi }_{s}}$) and pressure potential ${{\psi }_{p}}:{{\psi }_{w}}={{\psi }_{s}}+{{\psi }_{p}}$ The osmotic potential,...
Given below is a table. Fill in the gaps
propertysimple diffusion facilitated transportactive transporti. Highly selectiveAYesFii. uphill transport BDYesii. requires ATPCEG Solution:...
In a plant, translocation in the xylem is unidirectional while in phloem it is bidirectional. Explain.
Solution: Phloem, a vascular bundle, is in charge of transporting food from the source to the sink. During seasons like spring, however, the process is reversed since the food that has been stored...
The C4 plants are twice as efficient as C3 plants in terms of fixing CO2 but lose only _________ as much water as C3 plants for the same amount of CO2 fixed.
Solution: Half In terms of CO2 fixation, C4 plants are twice as efficient as C3 plants, but they lose half as much water for the same amount of CO2 fixed.
The plant cell cytoplasm is surrounded by both cell wall and cell membrane. The specificity of transport of substances are mostly across the cell membrane, because _________________.
Solution: Both the cell wall and the cell membrane surround the cytoplasm of plant cells. Water and chemicals in solutions pass freely through the cell wall, but the membrane is selectively...
Water moves up against gravity and even for a tree of 20m height, the tip receives water within two hours. The most important physiological phenomenon which is responsible for the upward movement of water is _______________________.
Solution: Transpiration pull Even for a 20-meter-tall tree, water travels up against gravity. Water is delivered to the tip within two hours. Transpiration pull is the most essential physiological...
Absorption of water from the soil by dry seeds increases the _____________, thus helping seedlings to come out of the soil
Solution: Pressure The pressure created by dry seeds absorbing water from the earth increases, allowing seedlings to emerge from the soil.
A flowering plant is planted in an earthen pot and irrigated. Urea is added to make the plant grow faster, but after some time the plant dies. This may be due to _______________ .
Solution: Exosmosis A blossoming plant is irrigated and put in an earthen container. The plant is given urea to help it grow faster, but it eventually dies. Exosmosis could be to blame. Explanation:...
Osmosis is a special kind of diffusion, in which water diffuses across the cell membrane. The rate and direction of osmosis depends upon both ______________.
Solution: Pressure and concentration gradient Water diffuses over the cell membrane in osmosis, which is a type of diffusion. The pace and direction of osmosis are determined by a variety of...
In passive transport across a membrane, when two different molecules move in the opposite direction and independent of each other, it is called ___________.
Solution: Antiport Antiport is a type of passive transport across a membrane in which two protein molecules travel in opposite directions and independently of one another. Antiport is the...
Smaller, lipid-soluble molecules diffuse faster through the cell membrane, but the movement of hydrophilic substances are facilitated by certain transporters which are chemically ____________.
Solution: Smaller, lipid-soluble molecules diffuse faster through the cell membrane, although some transporters, which are primarily proteins, aid the passage of hydrophilic compounds.
Based on the figure given below which of the following statements is not correct?
a. Movement of solvent molecules will take place from chamber A to B.
b. Movement of solute will take place from A to B.
c. Presence of a semipermeable is a pre-requisite for this process to occur.
d. The direction and rate of osmosis depend on both the pressure gradient and concentration gradient.
Solution: Option (b) is the answer. Because the water in chamber A contains fewer solute particles, the water potential in chamber A is higher, allowing the water molecules in chamber A to move more...
Mycorrhiza is a symbiotic association of a fungus with root system which helps in
A. Absorption of water
B. Mineral nutrition
C. Translocation
D. Gaseous exchange
Options:
a. Only A
b. Only B
c. both A and B
d. both B and C
Solution: Option (c) is the answer. Fungal mycelia are found in the roots of several higher plants. Mycorrhiza is the name for such a relationship. It reflects a mutualistic (symbiotic) relationship...
Water potential of pure water at standard temperature is equal to
a. 10
b. 20
c. Zero
d. None of the above
Solution: Option (c) is the answer. Water potential is the term for water's free energy. Water potential is also known as water's chemical potential. The kinetic energy or water potential of a...
When a plant undergoes senescence, the nutrients may be
a. accumulated
b. withdrawn
c. translocated
d. None of the above
Solution: Option (c) is the answer. Mineral ions are regularly moved from older portions of a plant to apical and lateral meristems, new leaves, developing fruits and seeds by diffusion and active...
Which of the following is an example of imbibition
a. uptake of water by root hair
b. exchange of gases in stomata
c. swelling of seed when putting in soil
d. opening of stomata
Solution: Option (c) is the answer. Water is absorbed by solids-colloids during imbibition, causing them to expand dramatically in volume. Water absorption by seeds and dry wood are two famous...
The process of guttation takes place
a. when the root pressure is high and the rate of transpiration is low.
b. when the root pressure is low and the rate of transpiration is high
c. when the root pressure equals the rate of transpiration
d. when the root pressure, as well as rate of transpiration, are high.
Solution: Option (a) is the answer. Guttation occurs in the absence of transpiration, particularly in low-light situations (early morning). While guttation causes water droplets to accumulate on the...
The form of sugar transported through phloem is
a. glucose
b. fructose
c. sucrose
d. ribose
Solution: Option (c) is the answer. Sugars synthesized in leaves (as a result of photosynthesis) are transported primarily through phloem downwards, upwardly, and laterally to all other organs,...
The lower surface of leaf will have more number of stomata in a
a. dorsiventral leaf
b. isobilateral leaf
c. both a and b
d. none of the above
Solution: Option (a) is the answer. The evaporative loss of water by plants is known as transpiration. It is mostly transmitted through the stomata in the leaves. In a dorsiventral (typically...
Draw labelled diagrams of
a. Female and male thallus of a liverwort. b. Gametophyte and sporophyte of Funaria. c. Alternation of generation in Angiosperm.
With the help of a schematic diagram describing the haplo-diplontic life cycle pattern of a plant group.
●An alternation of the generation takes place between gametophyte & sporophyte.●The haploid & diploid phase is called the haplodiplontic life cycle.
The male and female reproductive organs of several pteridophytes and gymnosperms are comparable to floral structures of angiosperms. Attempt to compare the various reproductive parts of pteridophytes and gymnosperms with reproductive structures of angiosperms.
Reproductive parts of pteridophytes and gymnosperm ●Strobili/cone ●Microsporophyll ●Megasporophyll ●Microsporangium ●Megasporangium Reproductive structures of angiosperms ●Flower ●Stamen...
The giant Redwood tree (Sequoia sempervirens) is a/an
a. Angiosperm b. Free fern c. Pteridophyte d. Gymnosperm A)Correct option - D B) Explanation of correct option - ●Gymnosperms have no flowers or fruits ● Naked seeds on the surface of their...
Protonema is
a. Haploid and is found in mosses b. Diploid and is found in liverworts c. Diploid and is found in pteridophytes d. Haploid and is found in pteridophytes A)Correct option - A B) Explanation of...
If the diploid number of a flowering plant is 36. What would be the chromosome number in its endosperm?
a.36 b. 18 c. 54 d. 72 A)Correct option - C B) Explanation of correct option - ●Number of chromosomes in flower cell will be in diploid 2n ● Endosperm will have 2n=36 and n= 36/2 = 18. ●...
The embryo sac of an Angiosperm is made up of
a.8 cells b. 7 cells and 8 nuclei c. 8 nuclei d. 7 cells and 7 nuclei A)Correct option - B B) Explanation of correct option - ●Embryo sac of an Angiosperm is made up of 7 cells and 8...
Plants of this group are diploid and well adapted to extreme conditions. They grow bearing sporophylls in compact structures called cones. The group in reference is
a. Monocots b. Dicots c. Pteridophytes d. Gymnosperms A)Correct option - D B) Explanation of correct option - ●Gymnosperms have no flowers or fruits ● Naked seeds on the surface of their...
A Prothallus is
a. A structure in pteridophytes formed before the thallus develops b. A sporophytic free-living structure formed in pteridophytes c. A gametophyte free-living structure formed in pteridophytes ...
A plant shows thallus level of organization. It shows rhizoids and is haploid. It needs water to complete its life cycle because the male gametes are motile. Identify the group to which it belongs to
a. Pteridophytes b. Gymnosperms c. Monocots d. Bryophytes A)Correct option - D B) Explanation of correct option - ●A plant that consists of a thallus. ●embryo stage, vascular and mechanical tissues...
Holdfast, stipe and frond constitute the plant body in case of
a. Rhodophyceae b. Chlorophyceae c. Phaeophyceae d. All of the above A)Correct option - C B) Explanation of correct option - ●Phaeophyceae is a brown algae. ●Phaeophyceae is a large group of...
The fusion of two motile gametes which are dissimilar in size is termed as
a. Oogamy b. Isogamy c. Anisogamy d. Zoogamy A)Correct option - C B) Explanation of correct option - ●It is a form of Sexual reproduction that involves the union or fusion of two gametes that ...
Cyanobacteria are classified under
a. Protista b. Plantae c. Monera d. Algae A)Correct option - C B) Explanation of correct option - ●Monera is an unicellular organism with a prokaryotic cell organization ● such as bacteria. ● They...
Heterospory i.e., the formation of two types of spores – microspores and megaspores is a characteristic feature in the life cycle of a few members of pteridophytes and all spermatophytes. Do you think heterospory has some evolutionary significance in the plant kingdom?
●Heterospory development occurs in situ embryos .The embryo takes nutrition from the female gametophyte and which gives it better protection. ● Heterospory occurs due to the evolution of seed habit,...
How far does Selaginella, one of the few living members of lycopodiales (pteridophytes) , fall short of seed habit?
●Selaginella produces macro and micro spores both . ●Selaginella produce female and male gametophytes both . ●The embryo formed by selaginella was retained within the female gametophyte...
Each plant or group of plants has some phylogenetic significance concerning evolution: Cycas, one of the few living members of gymnosperms, is called the ‘relic of the past’. Can you establish a phylogenetic relationship of Cycas with any other group of plants that justifies the above statement?
●Cycas is the connecting link between Gymnosperms and pteridophytes . ●They show some features which are the same as in pteridophytes such as flagellated antherozoids, circinate ptyxis,...
The heterosporous pteridophytes show certain characteristics, which are the precursor to the seed habit in gymnosperms. Explain.
Genera such as selaginella, Sylvania, and Marsilea are producing two kinds of spores namely Micro and macro spores which are commonly known as heterosporous. 1.Evolutionary heterospory....
In which plant will you look for mycorrhiza and coralloid roots? Also, explain what these terms mean.
●Mycorrhiza can be seen in Pinus and coralloid root in Cycas. ●Mycorrhiza – system association between the roots of higher plants & fungi. Fungi help the plants in the absorption of nutrients...
The gametophyte is a dominant phase in the life cycle of a bryophyte. Explain.
●Due to the alteration in the gametophytic and sporophytic life cycle Bryophyte shows haplo -diplontic both types of life cycle. ●Major part is dominated by the haploid gametophytic...
Lichen is usually cited as an example of ‘symbiosis’ in plants where an algal and a fungal species live together for their mutual benefit. Which of the following will happen if algal and fungal partners are separated from each other?
a. Both will survive and grow normally and independent of each other. b. Both will die c. The algal component will survive while the fungal component will die. d. The fungal component will survive...
Explain why sexual reproduction in angiosperms is said to take place through double fertilization and triple fusion. Also, draw a labelled diagram of the embryo sac to explain the phenomena.
●The two male nuclei enter the embryo sac, one of the male gametes fuses with the egg to form a diploid zygote .● The other male gamete fuses with a diploid secondary nucleus to form triploid...
The stain used to visualise mitochondria is
a. Fast green b. Safranin c. Acetocarmine d. Janus green A)correct option -D B)Explanation of correct option - Janus Green is a basic dye and stain used in histology. It is used to stain...
Which of the following is not a function of cytoskeleton in a cell?
a. Intracellular transport b. Maintenance of cell shape and structure c. Support of the organelle d. Cell motility A)correct option -A B)Explanation of correct option - Intracellular transport is...
Plastid differs from mitochondria based on one of the following features. Mark the right answer.
a. Presence of two layers of membrane b. Presence of ribosome c. Presence of thylakoids d. Presence of DNA A)correct option -C B)Explanation of correct option - Thylakoids are membrane bound...
Which of the following statements is not true for plasma membranes?
a. It is present in both plant and animal cell b. Lipid is present as a bilayer in it c. Proteins are presently integrated as well as loosely associated with the lipid bilayer d. Carbohydrate is...
Which of the following is not true of a eukaryotic cell?
a. The cell wall is made up of peptidoglycans b. 80S type of ribosomes is present in the cytoplasm c. Mitochondria contain circular DNA d. Membrane-bound organelles are present A)correct option -A...
What is a tonoplast?
a. The outer membrane of mitochondria b. The inner membrane of chloroplast c. Membrane boundary of the vacuole of plant cells d. The cell membrane of a plant cell A)correct option -C B)Explanation...
Which of the following statements is true for a secretory cell?
a. Golgi apparatus is absent b. Rough Endoplasmic Reticulum (RER) is easily observed in the cell c. Only Smooth Endoplasmic Reticulum (SER) is present d. Secretory granules are formed in the...
Who proposed the fluid mosaic model of the plasma membrane?
a. Benda b. Schleiden and Schwann c. Singer and Nicolson d. Robert Brown A)correct option -C B)Explanation of correct option - Fluid mosaic model explains various observations regarding the...
Which of the following features is common to prokaryotes and many eukaryotes?
a. Chromatin material b. Cell wall present c. Nuclear membrane present d. Membranes bound sub-cellular organelles present A)correct option -B B)Explanation of correct option - Cell wall is present...
Different cells have different sizes. Arrange the following cells in an ascending order of their size. Choose the correct option among the followings
i. Mycoplasma ii. Ostrich eggs iii. Human RBC iv. Bacteria Options: a. i, iv, iii & ii b. i, iii, iv & ii c. ii, i, iii & iv d. iii, ii, i & iv A)correct option -A B)Explanation of...
Which of the following stains is not used for staining chromosomes?
a. Basic Fuchsin b. Safranin c. Methylene green d. Carmine A)correct option -A B)Explanation of correct option - Basic fuchsin staining is certified to use for the detection of acid-fast bacilli and...
Which one of these is not a eukaryote?
a. Euglena b. Anabaena c. Spirogyra d. Agaricus A)correct option -A B)Explanation of correct option - Euglena is a prokaryotic because it does not not any cell organelles and nucleus is not bounded...
Select one which is not true for ribosome
a. Made of two subunits b. Form polysome c. May attach to m+RNA d. Have no role in protein synthesis A)correct option -D B)Explanation of correct option - The main function of ribosomes is to...
Many elements are found in living organisms either free or the form of compounds. Which of the following is not found in living organisms?
a. Silicon b. Magnesium c. Iron d. SodiumSolution A)correct option -A B)Explanation of correct option - ●The highest silicon content in the body was found in connective tissue, bones, kidneys,...
It is said that the elemental composition of living organisms and that of inanimate objects (like earth’s crust) are similar in the sense that all the major elements are present in both. Then what would be the difference between these two groups? Choose the correct answer from among the following:
a. Living organisms have more gold in them than inanimate objects b. Living organisms have more water in their body than inanimate objects c. Living organisms have more carbon, oxygen and hydrogen...
Amino Acids have both an amino group and a carboxyl group in their structure. Which one of the following is an amino acid?
a. Formic acid b. Glycerol c. Glycolic Acid d. Glycine A)correct option -D B)Explanation of correct option - Glycine is an amino acid, or a building block for protein. The body can make glycine on...
An amino acid under certain conditions has both positive and negative charges simultaneously in the same molecule. Such a form of amino acid is called
a. Acidic form b. Basic form c. Aromatic form d. Zwitterionic form A)correct option -D B)Explanation of correct option - A zwitterion is a molecule that contains both a positive and a negative...
Sugars are technically called carbohydrates, referring to the fact that their formulae are only multiple of C(H2O). Hexoses, therefore, have six carbons, twelve hydrogens and six oxygen atoms. Glucose is a hexose.Choose from among the following another hexose.
a. Fructose b. Erythrose c. Ribulose d. Ribose A)correct option -A B)Explanation of correct option - ●Fructose is a type of sugar known as a monosaccharide. ●Fructose is also known as “fruit sugar”...
When you take cells or tissue pieces and grind them with an acid in a mortar and pestle, all the small biomolecules dissolve in the acid.Proteins, polysaccharides and nucleic acids are insoluble in mineral acid and get precipitated. The acid-soluble compounds include amino acids, nucleosides, small sugars etc. When one adds a phosphate group to a nucleoside, one gets another acid-soluble biomolecule called
a. Nitrogen base b. Adenine c. Sugar phosphate d. Nucleotide A)correct option -D B)Explanation of correct option - The basic building block of nucleic acids. A nucleotide consists of a sugar...
When we homogenise any tissue in acid the acid-soluble pool represents
The most abundant component of living organisms is
a. Protein b. Water c. Sugar d. Nucleic acid A)correct option -B B) Explanation of correct option - Most abundant compound in most living things is water. Water is a compound of hydrogen(H) and...
A homopolymer has only one type of building block called monomer repeated ‘n’ number of times. A heteropolymer has more than one type of monomer. Proteins are heteropolymers usually made of
a. 20 types of monomers b. 40 types of monomers c. 30 types of monomers d. only one type of monomer A)correct option-A B)Explanation of correct option- All proteins are made up of different...
Proteins perform many physiological functions. For example, some functions as enzymes. Which of the following represents an additional function that some proteins discharge?
a. Antibiotics b. Pigment conferring colour to skin c. Pigments making colours of flowers d. Hormones A)correct option -D B)Explanation of correct option- Protein hormones or polypeptide hormones...
.Glycogen is a homopolymer made of
a. Glucose units b. Galactose units c. Ribose units d. Amino Acids A)correct option -A B) Explanation of correct option- Glycogen is a polysaccharide of glucose that acts as a form of energy...
.Glycogen is a homopolymer made of
a. Glucose units b. Galactose units c. Ribose units d. Amino Acids A)correct option -A B) Explanation of correct option- Glycogen is a polysaccharide of glucose that acts as a form of energy...
The number of ‘ends’ in a glycogen molecule would be
a. Equal to the number of branches plus one b. Equal to the number of branch points c. One d. Two, one on the left side and another on the right side A)correct option -D B) Explanation of correct...
The primary structure of a protein molecule has
a. Two ends b. One end c. Three ends d. No ends A)correct option -A B) Explanation of correct option - The sequence of amino acids in a polypeptide chain has two ends For example -the hormone...
5.The primary structure of a protein molecule has
a. Two ends b. One end c. Three ends d. No ends A)correct option -A B) Explanation of correct option - The sequence of amino acids in a polypeptide chain has two ends For example -the hormone...
Enzymes are biocatalysts. They catalyse biochemical reactions. In general,they reduce the activation energy of reactions. Many Physico chemical processes are enzyme-mediated. Which of the following reactions is not enzyme mediated in the biological system?
a. Dissolving CO2 in water b. Untwining the two strands of DNA c. Hydrolysis of sucrose d. Formation of peptide bond A)correct option -A B)Explanation of correct option - Carbon dioxide dissolves in...
How are prosthetic groups different from co-factors?
Cofactors are the non proteinaceous enzymes, it may be organic or inorganic form of the enzyme. The prosthetic group of these belongs to organic cofactors which remains tightly bound with apoenzymes.
The reaction given below is catalysed by oxidoreductase between two substrates A and A’, complete the reaction. A reduced + A’ oxidized
P(reduced )+ P’(Oxidized)→ P(oxidized)+ P'(reduced)
Write the name of anyone amino acid, sugar, nucleotide and fatty acid.
A.Amino acid- Glycine B.Sugar- Glucose, fructose C.Nucleotide- Adenosine D.Fatty acid- Oleic acid
8. Plasticity in plant growth means that
a. Plant roots are extensible b. Plant development is dependent on the environment c. Stems can extend d. None of the aboveSolution: Option (b) is the answer.
7. The term synergistic action of hormones refers to
a. When two hormones act together but bring about the opposite effects. b. When two hormones act together and contribute to the same function. c. When one hormone affects more than one function. d....
6. Growth can be measured in various ways. Which of these can be used as parameters to measure growth
a. Increase in cell number b. Increase in cell size c. Increase in length and weight d. All the above Solution: Option (d) is the answer.
5. Apples are generally wrapped in waxed paper to
a. Prevent sunlight from changing its colour b. Prevent aerobic respiration by checking the entry of O2. c. Prevent ethylene formation due to injury d. Make the apples look attractive Solution:...