Solution: They must pay attention to animal behavior. At regular intervals, they should perform a basic check-up. Vaccination is given for a particular amount of time. Analyzing and inspecting the...
What is aquaculture? Give an example of an animal that can be multiplied by aquaculture.
Solution: Aquaculture is defined as the culture or farming of all the aquatic plants and animals for economic use. Therefore, aquaculture is the breeding of aquatic animals or the cultivation of...
A person who is allergic to pulses was advised to take a capsule of Spirulina daily. Give the reasons for the advice.
Solution: Spirulina is a high-protein food that contains all of the essential amino acids. Spirulina has a considerably higher protein content than pulses. As a result, it may be a healthier protein...
Why are proteins synthesised from Spirulina called single-cell proteins?
Solution: Single called protein is a protein-rich meal manufactured by microorganisms (SCP) Spirulina is a type of bacteria that has a lot of protein. Since bacteria proliferate at such a rapid...
Why is it easier to culture meristems compared to permanent tissues?
Solution: Meristems have the ability to divide continuously throughout their lives, and their walls are thin and elastic to aid division, making them ideal for tissue. They divide and differentiate...
What is protoplast fusion?
Solution: Protoplast fusion is a way of fusing somatic cells from various plants to create a hybrid. Both spontaneous and induced fusion procedures can be used to combine protoplasts from two...
Why are plants obtained by protoplast culture called somatic hybrids?
Solution: Somatic hybrids are formed by fusing isolated protoplasts from two different plant varieties, each with a desirable characteristic, to produce a hybrid protoplast that can be grown to form...
What is meant by ‘hidden hunger’?
Solution: Many people are able to obtain a product that is solely composed of carbohydrates. Other nutrients, such as protein, vitamins, and minerals, are not available to these people. This is...
A few statements are given below followed by a set of terms in a box. Pick the correct term and write it against the appropriate statement
a. Mating of closely related individuals within the same breed
b. Mating of animals of the same breed but having no common ancestors on either side for 4-6 generations
c. Mating of animals of two different species
d. Breeding of animals belonging to different breeds
(i) Crossbreeding, (ii) Inter-specific hybridization, (iii) Outbreeding, (iv) Outcrossing, (v) Inbreeding
Solution: a) Mating of closely related individuals within the same breed - v) inbreeding b) Mating of animals of the same breed but with no common ancestors on either side for at least 4-6...
Name a man-made cereal? Trace how it was developed and where is it used?
Solution: Triticale was the earliest cereal created by humans. It's a cross between wheat and rye. It was first bred in the laboratory in Scotland and Sweden in the late 1800s. It blends wheat's...
In the area of plant breeding, it is important not only to preserve the seeds of the variety being cultivated but also to preserve all its wild relatives. Explain with a suitable example.
Solution: Although wild variants of domesticated plants have a low yield, they are disease and insect-resistant. They have various resistant characters (genes) that can be introduced in other...
In animal husbandry, if two closely related animals are mated for a few generations, it results in loss of fertility and vigour. Why is this so?
Solution: Two closely related species are mated for a few generations, the technique is known as inbreeding, and if this is continued, inbreeding depression occurs. The condition is known as...
Can gamma rays used for crop improvement programmes prove to be harmful to health? Discuss.
Solution: If gamma rays aren't directly exposed to humans, they can't be hazardous to their health. Only the crop varieties are mutated as a result. Since humans are not in direct contact with the...
Millions of chicken were killed in West Bengal, Assam, Orissa and Maharashtra recently. What was the reason?
Solution: Millions of chickens were murdered (culled) in West Bengal, Orissa, and Maharashtra after the H5N1 virus, the cause of Bird Flu. Since they were infected with the bird flu virus, which can...
A collection of all the alleles of all the genes of a crop plant is called:
a. germplasm collection
b. protoplasm collection
c. herbarium
d. soma clonal collection.
Solution: Germplasm collection refers to the full collection of all the various alleles of all the genes in a certain crop. It is used to assess the desirable character combinations in plants. It is...
33 per cent of India’s Gross Domestic Product comes from
a. Industry
b. Agriculture
c. Export
d. Small-scale cottage industries.
Solution: Agriculture, together with its associated industries, is unquestionably India's major source of income, particularly in the country's vast rural areas. It also makes a substantial...
The agriculture sector of India employs about:
a. 50 per cent of the population
b. 70 per cent of the population
c. 30 per cent of the population
d. 60 per cent of the population.
Solution: India's agriculture sector employs over 70% of the population, with 80 percent of the population living in rural areas. Agriculture accounts for 20.5 percent of India's GDP. So, the...
More than 70 per cent of the livestock population is found in:
a. Denmark
b. India
c. China
d. India and China.
Solution: India and China account for more than 70% of the world's cattle population. However, the contribution to global agriculture production is only 25%, implying a very poor productivity per...
Which one of the following products of apiculture is used in cosmetics and polishes:
a. honey
b. propolis
c. wax
d. Royal jelly
Solution: Apiculture, also known as beekeeping, is the practice of maintaining bee colonies in order to produce honey. Beeswax is a by-product of honey bees that are used to make numerous polishes...
Which one of the following is a marine fish:
a. Rohu
b. Hilsa
c. Catla
d. Common Carp.
Solution: Rohu, Catla, and common carp are freshwater fish, while Hilsa is both a freshwater and a marine fish. Freshwater fish are hypertonic to their surroundings, meaning that the concentration...
To isolate protoplast, one needs:
a. pectinase
b. cellulase
c. both pectinase and cellulase
d. chitinase.
Solution: Plant cell walls are made up of cellulose, soluble proteins, and pectin, and are organized in layers. As a result, both pectinase (a pectin-degrading enzyme) and cellulase are required to...
Protoplast is:
a. another name for protoplasm
b. an animal cell
c. a plant cell without a cell wall
d. a plant cell.
Solution: The protoplasm of a living cell whose cell wall has been removed is known as protoplast. In other words, a protoplast is a plant cell that lacks a cell wall. It is done in order to create...
Micro-propagation is:
a. propagation of microbes in vitro
b. propagation of plants in vitro
c. propagation of cells in vitro
d. growing plants on a smaller scale.
Solution: Plants are propagated by developing plantlets in tissue culture and then transplanting them into the wild. Tissue culture is a technique for growing plant cells, tissues, or organs in an...
Lysine and tryptophan are:
a. proteins
b. non-essential amino acids
c. essential amino acids
d. aromatic amino acids.
Solution: The essential amino acids are those that our bodies cannot synthesize and must be obtained from our food. Lysine and tryptophan are essential amino acids. Non-essential amino acids are...
The biggest constraint of plant breeding is:
a. availability of desirable gene in the crop and its wild relatives
b. infrastructure
c. trained manpower
d. transfer of genes from unrelated sources.
Solution: Plant breeding is the process of introducing a desired gene from a wild type into plants. When a related species is involved, the genes can only be transmitted from the wild type. The...
An explant is:
a. dead plant
b. part of the plant
c. part of the plant used in tissue culture
d. part of the plant that expresses a specific gene.
Solution: An explant is a section of the plant that has been removed and cultivated under sterile conditions in special nutritive media. In tissue culture, this is the procedure for producing a...
Given below are a few statements regarding somatic hybridization. Choose the correct statements.
(i) protoplasts of different cells of the same plant are fused
(ii) protoplasts from cells of different species can be fused
(iii) treatment of cells with cellulase and pectinase is mandatory
(iv) the hybrid protoplast contains characters of only one parental protoplast.
a. (i) and (iii)
b. (i) and (ii)
c. (i) and (iv)
d. (ii) and (iii)
Solution: Somatic hybridization is a technique for manipulating cellular genomes by fusing protoplasts from different species. Treatment of cells with digesting enzymes can be used to isolate their...
The term ‘totipotency’ refers to the capacity of a:
a. cell to generate whole plant
b. bud to generate whole plant
c. seed to germinate
d. cell to enlarge in size
Solution: The ability to create a completely new plant from any cell is referred to as totipotency. Explants could be used to regrow the entire plant (any part of the plant that is taken out and...
The scientific process by which crop plants are enriched with certain desirable nutrients are called:
a. crop protection
b. breeding
c. bio-fortification
d. bio-remediation.
Solution: The process of improving the nutritional quality of food crops by agronomic methods, traditional plant breeding, or modern biotechnology is known as biofortification. Biofortification...
Use of certain chemicals and radiation to change the base sequences of genes of crop plants are termed:
a. recombinant DNA technology
b. transgenic mechanism
c. mutation breeding
d. gene therapy.
Solution: Mutation breeding is the technique of exposing seeds to chemicals and radiation to create mutants with desirable qualities that may be bred with other growers. The base sequence of genes...
Fungicides and antibiotics are chemicals that:
a. enhance yield and disease resistance
b. kill pathogenic fungi and bacteria, respectively
c. kill all pathogenic microbes
d. kill pathogenic bacteria and fungi respectively.
Solution: Biocidal chemical substances known as fungicides are used to kill parasitic fungi or their spores. They stop pathogenic fungi from growing and causing major damage to crops. Antibiotics...
Which one of the following combination would a sugarcane farmer look for in the sugarcane crop?
a. Thick stem, long internodes, high sugar content and disease resistant
b. Thick stem, high sugar content and profuse flowering
c. Thick stem, short internodes, high sugar content, disease-resistant
d. Thick stem, low sugar, content, disease-resistant
Solution: Saccharum barberi is sugarcane that is grown in north India, but it has a low sugar content and yield. Saccharum officinarum, on the other hand, was grown in south India and has thick...
Several South Indian states raise 2-3 crops of rice annually. The agronomic feature that makes this possible is because of
a. shorter rice plant
b. better irrigation facilities
c. early yielding rice variety
d. disease-resistant rice variety
Solution: Rice is grown in some South Indian states twice a year. This is owing to the development of improved rice varieties with increased nutritious content and higher annual yields. Golden rice...
In virus-infected plants, the meristematic tissues in both apical and axillary buds are free of the virus because:
a. the dividing cells are virus-resistant
b. meristems have anti-viral compounds
c. the cell division of meristems is faster than the rate of viral multiplication
d. Viruses cannot multiply within the meristem cell (s).
Solution: The meristematic tissues are virus-free because virus spread in plant tissue does not keep up with meristem growth, which means meristem growth outpaces viral multiplication. Since they...
Which one of the following is not a fungal disease?
a. Rust of wheat
b. Smut of Bajra
c. Black rot of crucifers
d. Red rot of sugarcane
Solution: The fungus Puccinia graminis causes stem, black, and cereal rusts. It belongs to the phylum Basidiomycota, which is part of the kingdom Fungi. Infected plants produce fewer tillers and...
Sonalika and Kalyan Sona are varieties of:
a. wheat
b. rice
c. millet
d. tobacco
Solution: Wheat varieties like Sonalika and Kalyan Sona are semi-dwarf varieties developed by Norman E. Borlaug in Mexico in 1963. These are drug-resistant varieties with a high yield. There are...
Inbreeding is carried out in animal husbandry because it:
a. increases vigour
b. improves the breed
c. increases heterozygosity
d. increases homozygosity
Solution: Mating genetically identical creatures are referred to as inbreeding. Interbreeding aids in the expression of advantageous recessive alleles for a trait. Interbreeding is carried out in...
A group of animals which are related by descent and share many similarities are referred to as:
a. breed
b. race
c. variety
d. species
Solution: A breed is a collection of animals that are connected by descent and share several characteristics such as overall appearance, size, and traits. Leghorn, for example, is a better chicken...
The chances of contacting bird flu from a properly cooked (above 100°C) chicken and egg are:
a. very high
b. high
c. moderate
d. negligible
Solution: When prepared correctly, chicken and other poultry products are safe to eat. The H5N1 virus, which causes avian flu, dies when poultry is cooked to 70 degrees Celsius. As a result, all...
Draw a diagrammatic sketch of the biogas plant, and label its various components given below: Gas Holder, Sludge Chamber, Digester, Dung + water chamber.
What are viruses parasitising bacteria called? Draw a well-labelled diagram of the same.
Bacteriophages are viruses that parasitize other viruses. Bacteriophages are viruses that assault bacteria and infect and proliferate within them. They are composed of nucleic acid molecules that...
Which type of food would have lactic acid bacteria? Discuss their useful application.
Solution: Lactic acid bacteria (LAB) is a type of bacteria that is commonly used to ferment or culture foods. Curd contains lactic acid bacteria (LAB). It can be used for a variety of purposes,...
(a) What would happen if a large volume of untreated sewage is discharged into a river? (b) In what way anaerobic sludge digestion is important in sewage treatments?
Solution: a) The Biological Oxygen Demand (BOD) will increase, resulting in the mortality of species such as fish due to a lack of oxygen in the water. As people drink water directly from the river,...
Describe the main ideas behind the biological control of pests and diseases.
Solution: Biological pest and disease control is based on the interdependency of multiple ecosystem components. This method is also founded on the recognition of the possible harm caused by chemical...
(a) Discuss the major programs that the Ministry of Environment and Forests, Government of India, has initiated for saving major Indian rivers from pollution.(b) Ganga has recently been declared the national river. Discuss the implication with respect to pollution of this river.
(a) The Government of India's Ministry of Environment and Forests has launched two plans: i. Action Plan for the Ganga ii. Action Plan for the Yamuna These proposals called for a large number of...
Why is aerobic degradation more important than anaerobic degradation for the treatment of large volumes of wastewaters rich in organic matter? Discuss.
Solution: Aerobic degradation is more significant than anaerobic degradation for the treatment of large volumes of organic-rich wastewaters because: i) the majority of the organic sludge is digested...
What are bio fertilizers? Give two examples.
Solution: A 'biofertilizer' is a chemical that contains living microorganisms that encourage development by boosting the supply or availability of primary nutrients when applied to seed, plant...
Which bacterium has been used as a clot-buster? What is its mode of action?
Solution: Streptokinase, produced by the bacterium Streptococcus, is utilized as a 'clot buster.' This enzyme has a fibrinolytic activity, which means it breaks down clots that form in the blood...
What is a broad-spectrum antibiotic? Name one such antibiotic.
Solution: Antibiotics with a broad spectrum of action are effective against both gram-positive and gram-negative bacteria. Chloramphenicol, for example, is used to treat typhoid, dysentery, acute...
How do microbes reduce the environmental degradation caused by chemicals?
Solution: Microbes aid in the reduction of chemical-induced environmental damage. Agriculture is a good example of bioremediation. Biofertilizers are made up of bacteria that enrich the soil by...
What is the chemical nature of biogas? Name an organism which is involved in biogas production?
Solution: Biogas is made up of three different gases. Methane ($C{{H}_{3}}$) makes up roughly 60-70 percent of the overall volume, carbon dioxide ($C{{O}_{2}}$) makes up about 30-40 percent, and...
What roles do enzymes play in detergents that we use for washing clothes? Are these enzymes produced from some unique microorganisms?
Solution: Lipase and proteases are examples of enzymes that are crucial in detergents. They're used in detergents to clean and remove oily stains from clothing. These enzymes are derived from the...
How do bioactive molecules of fungal origin help in restoring good health of humans?
Solution: As a number of bioactive molecules are important in the medical treatment of people, bioactive molecules of fungal origin aid in the restoration of human health. a) A statin is a drug that...
Name the scientists who were credited for showing the role of Penicillin as an antibiotic?
Solution: Sir Alexander Fleming White discovered penicillin while researching Staphytococd bacteria. Ernst Chain and Howard Florey, on the other hand, discovered its full potential as an effective...
How was penicillin discovered?
Solution: Alexander Fleming discovered penicillin by accident in 1921. When he returned from a vacation, he discovered that one of his staphylococcus culture plates had become infected with mold....
Why are cyanobacteria considered useful in paddy fields?
Solution: Cyanobacteria can fix nitrogen in the atmosphere. The soil conditions in paddy fields provide an ideal environment for nitrogen-fixing cyanobacteria to thrive. Biofertilizers such as...
How do mycorrhizal fungi help the plants harboring them?
Solution: Mycorrhiza is a fungus that aids the plants that harbor it in drawing more nutrients from the soil, such as phosphorus, and transferring it to the host plant. This also aids ion in drawing...
How has the bacterium Bacillus thuringiensis helped us in controlling caterpillars of insect pests?
Solution: The bacterium Bacillus thuringiensis aids in the control of insect pest caterpillars by producing an endotoxin in the caterpillar's midgut after it is ingested by the pest. The endotoxin...
Why are flocs important in biological treatment of wastewater?
Solution: Flocs are bacterial masses that are linked together by fungal filaments to produce a mesh-like structure. The majority of the organic material in the sludge is digested by flocs. As a...
Name an immune immunosuppressive agent?
Solution: A substance that suppresses the immune system's response. It weakens the body's defenses against infections and other disorders including cancer. To prevent a person from rejecting a bone...
Name any two industrially important enzymes.
Solution: Enzymes are biological catalysts that are macromolecular in nature. Chemical reactions are sped up by them. Amylases and lipase are two industrially important enzymes. Amylase is a starch...
Name the states involved in the Ganga action plan.
Solution: The Ganga action plan involves the states of Uttarakhand, Uttar Pradesh, Bihar, Jharkhand, and West Bengal.
Which species of Penicillium produces Roquefort cheese?
Solution: Penicillium roqueforti is the type of penicillium that is used to produces Roquefort cheese. It forms when the cheese starts ripening. Penicillium roqueforti is also used to give a...
Why are blue-green algae not popular as bio fertilizers?
Solution: Blue-green algae have the ability to multiply in water and fix nitrogen. Paddy, on the other hand, is the only crop that can thrive in stagnant water. The majority of other crops do not...
What is the source organism for ECORI, restriction endonuclease?
Solution: ECORI's source organism is Escherichia coli restriction endonucleases (e.g., E.Coli). It's a rod-shaped, gram-negative bacteria found in the intestines of warm-blooded mammals.
Give any two microbes that are useful in biotechnology.
Solution: In the realm of biotechnology, microbes are commonly utilized to produce primary and secondary metabolites. These have a wide range of applications in agriculture, medicine, and...
What would happen if our intestine harbors microbial flora exactly similar to that found in the rumen of cattle?
Solution: Because the microbes in the rumen (a part of the stomach) of cattle, collectively known as methanogens, are capable of digesting cellulose and have cellulase enzyme, we would be able to...
Write the most important characteristic that Aspergillus niger, Clostridium bretylium, and Lactobacillus share.
Solution: The most important feature that Aspergillus Niger, Clostridium butylicum, and Lactobacillus have in common is that they are all microorganisms involved in the creation of acids....
Why is distillation required for producing certain alcoholic drinks?
Solution: Different types of alcoholic drinks are produced depending on the type of raw material used for fermentation and the style of processing (with or without distillation). Wine and beer are...
How has the discovery of antibiotics helped mankind in the field of medicine?
Solution: Antibiotics produced by bacteria are widely recognized as one of the most important discoveries of the twentieth century, and they have made a tremendous contribution to human wellbeing....
What for Nucleopolyhydro viruses are being used nowadays?
Solution: In farms, nucleopolyhydro viruses are employed to manage pests and other arthropods. These viruses are narrow-spectrum, meaning they have no effect on plants, cattle, humans, or non-target...
Why do we prefer to call secondary wastewater treatment as a biological treatment?
Solution: Secondary waste water treatment is called biological treatment because microorganisms are involved in the breakdown of organic matter in this phase of waste water treatment. The primary...
Name a microbe used for statin production. How do statins lower blood cholesterol level?
Solution: For commercial stain production, the yeast Monascus purpureus is utilised. Stain works by inhibiting the cholesterol-forming enzyme in a competitive manner, decreasing blood cholesterol...
What are fermenters?
Solution: The fermenter is a vessel or apparatus that is used to conduct microbial fermentation for the commercial manufacture of specific chemicals. Fermenters come in a variety of shapes and...
Why does ‘Swiss cheese’ have big holes?
Solution: When a bacterium called Propionibacterium sharmanii consumes the lactose protein in the cheese to make lactic acid, it produces a lot of carbon dioxide. This is why Swiss cheese has large...
Activated sludge should have the ability to settle quickly so that it can:
a. be rapidly pumped back from sedimentation tank to aeration tank
b. absorb pathogenic bacteria present in wastewater while sinking to the bottom of the settling tank
c. be discarded and anaerobically digested
d. absorb colloidal organic matter.
Solution: Option (a) is the answer. To be pumped back to the aeration tank, the activated sludge must settle fast. 'Be swiftly pumped back from the sedimentation tank to the aeration tank' is the...
Methanogens do not produce:
a. oxygen
b. methane
c. hydrogen sulfide
d. carbon dioxide.
Solution: Option (a) is the answer. Methanogens are a type of prokaryotic bacteria that belongs to the Archaea phylum. - Prokaryotes are organisms that lack a well-defined nucleus and cell...
The residue left after methane production from cattle dung is:
a. burnt
b. buried in landfills
c. used as manure
d. used in civil construction.
Solution: Option (c) is the answer Because it provides certain organic compounds and minerals to the soil, the residue remaining after methane production from calf dung is used as manure. As a...
Big holes in Swiss cheese are made by a:
a. a machine
b. a bacterium that produces methane gas
c. a bacterium producing a large amount of carbon dioxide
d. a fungus that releases a lot of gases during its metabolic activities.
Solution: Option (c) is the answer. When Propionibacterium shermani consumes lactic acid, it produces carbon dioxide and bubbles. Big holes appear in the Swiss cheese as a result of the bubbles. As...
Which one of the following is not a nitrogen-fixing organism?
a. Anabaena
b. Nostoc
c. Azotobacter
d. Pseudomonas
Solution: Option (d) is the answer. Nitrogen fixation is aided by Anabaena, Nostoc, and Azotobacter. Pseudomonas, on the other hand, execute denitrification, which is the conversion of nitrates to...
Mycorrhiza does not help the host plant in:
a. Enhancing its phosphorus uptake capacity
b. Increasing its tolerance to drought
c. Enhancing its resistance to root pathogens
d. Increasing its resistance to insects.
Solution: Option (d) is the answer. Mycorrhizae aids the host plant in boosting its phosphorus uptake capability and drought tolerance. Mycorrhiza produces compounds that protect against pathogens...
What would happen if oxygen availability to activated sludge flocs is reduced?
a. It will slow down the rate of degradation of organic matter
b. The centre of flocs will become anoxic, which would cause the death of bacteria and eventually breakage of flocs.
c. Flocs would increase in size as anaerobic bacteria would grow around flocs.
d. Protozoa would grow in large numbers
Solution: The microorganisms' ability to break down and destroy the organic materials in sewage or activated sludge is dependent on oxygen. The degradation rate will slow if the oxygen availability...
The free-living fungus Trichoderma can be used for:
a. killing insects
b. biological control of plant diseases
c. controlling butterfly caterpillars
d. producing antibiotics
Solution: Option (b) is the answer. Trichoderma fungi are free-living fungi found in abundance in root habitats. They are employed in the treatment of plant diseases and are efficient biocontrol...
The technology of biogas production from cow dung was developed in India largely due to the efforts of:
a. Gas Authority of India
b. Oil and Natural Gas Commission
c. Indian Agricultural Research Institute and Khadi & Village Industries Commission
d. Indian Oil Corporation
Solution: Option (c) is the answer. The Indian Agricultural Research Institute (IARI) and the Khadi & Village Industries Commission (KVIC) were instrumental in developing the method for...
Which one of the following alcoholic drinks are produced without distillation?
a. Wine
b. Whisky
c. Rum
d. Brandy
Solution: Option (a) is the answer. Wine is an alcoholic beverage made without the use of distillation, whereas whiskey, rum, and brandy are made by distilling a fermented broth. Depending on the...
BOD of wastewater is estimated by measuring the amount of:
a. total organic matter
b. biodegradable organic matter
c. oxygen evolution
d. oxygen consumption.
Solution: The amount of oxygen consumed when all the organic matter in one liter is oxidized by bacteria is known as biological oxygen demand (BOD). Thus, the amount of oxygen used is used to...
The primary treatment of wastewater involves the removal of:
a. dissolved impurities
b. stable particles
c. toxic substances
d. harmful bacteria.
Solution: Option (b) is the answer. Filtration and sedimentation are used in the initial treatment to physically remove particles from the sewage. These are removed first by sequential filtering,...
Methanogenic bacteria are not found in:
a. rumen of cattle
b. gobar gas plant
c. bottom of water-logged paddy fields
d. activated sludge.
Solution: Option (d) is the answer. In activated sludge, methanogenic bacteria (bacteria that create methane) are not detected. Microorganisms that produce methane are anaerobic bacteria. Aerobic...
Wastewater treatment generates a large quantity of sludge, which can be treated by:
a. anaerobic digesters
b. floc
c. chemicals
d. oxidation pond.
Solution: Option (a) is the answer. During secondary treatment, a huge amount of activated sludge is generated, which is used as an inoculum, and a small portion of it is piped back to the massive...
The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is
a. vitamin C
b. vitamin D
c. vitamin B12
d. vitamin E.
Solution: Option (c) is the answer 1. The bacteria lactobacillus converts the lactose in the milk into lactic acid, resulting in curd. 2. The nutritional content of the curd will change in...
1. Autecology is the:
a. Relation of heterogeneous populations to its environment b. Relation of an individual to its environment c. Relation of a community to its environment d. Relation of a biome to its environment...
Why does the zygote begin to divide only after the division of the primary endosperm cell (PEC)?
a. The zygote begins to divide right after the primary endosperm cell (PEC) because it needs nourishment during its development provided by the PEC. b. The PEC forms the endosperm where food...