Solution: Macronutrients are nutrients found in plant tissues at concentrations of more than 10 mole kg-1 of dry matter. Plant growth necessitates a huge amount of them. Carbon, Hydrogen, Oxygen,...
Why is purification of water and nutrient salts so important in studies involving mineral nutrition using hydroponics?
Solution: Hydroponics is a way of growing plants without soil in a nutrient solution. Impure water has many contaminants in the form of soluble minerals that are dissolved in it. These contaminants...
‘All elements that are present in a plant need not be essential to its survival’. Comment
Solution: No, only around 17 of the 105 elements taken by plants are required for plant development and survival.
Organise a discussion in your class on the topic – Are viruses living or nonliving?
Solution: Characters who are non-living have the following features There isn't any cellular structure.Like crystals, they can be preserved in bottles.No energy storage or liberation systems...
Give a brief account of viruses with respect to their structure and nature of genetic material. Also, name four common viral diseases.
Solution: Viruses are infectious organisms that, when located outside the host cell, solidify in structure. The genetic material is either DNA or RNA (but never both), and it is found inside the...
What are the characteristic features of Euglenoids?
Solution: Eugenoids have the following characteristics: no cell wall.Their bodies are flexible due to a protein-rich coating known as a pellicle.There are two flagella of differing lengths. In...
Give a comparative account of the classes of Kingdom Fungi under the following:
(i) mode of nutrition (ii) mode of reproduction
Solution: Fungi are eukaryotic heterotrophic organisms. The kingdom fungus includes black dots on stale bread, yeast (which is used to make bread and beer), white spots on mustard leaves, and...
What do the terms phycobiont and mycobiont signify?
Solution: Fungi and algae form a symbiotic relationship in lichens. A phycobiont is a type of algae that is also seen in mycobiont fungi. Mycobiont provides structural protection for algae against...
Plants are autotrophic. Can you think of some plants that are partially heterotrophic?
Solution: These organisms are green and autotrophic, yet they hunt on and digest minute components for their nitrogen supply. Insectivores and carnivorous plants are somewhat heterotrophic....
State two economically important uses of:
(a) heterotrophic bacteria
(b) archaebacteria
Solution: The two economically important uses of- a) Vitamins, medicines, cheese, and curd are all made using heterotrophic bacteria. They aid in nitrogen fixation and the production of humus. b)...
Why do we need to classify drugs in different ways?
The following are the reasons for the classification of drugs: (i) The pharmacological effect is based on the following: This definition is beneficial to physicians. It offers a wide range of...
Describe briefly the four major groups of Protozoa.
Solution: The following are the four primary groups of Protozoa: Protozoa of the amoeboid class: They live in aquatic habitats and use pseudopodia to move and catch their prey. Flagellated...
How are viroids different from viruses?
Solution: The difference between viroids from viruses- (i) Viroids have single-stranded RNA without a protein coat, whereas viruses contain single-stranded or double-stranded RNA associated with a...
What is shape-selective catalysis?
Shape-selective catalysis is a catalytic reaction that depends on the product molecules, the size of the reactants, and the pore structure and size of the catalyst. For example, a catalytic process...
Find out what do the terms ‘algal bloom’ and ‘red-tides’ signify.
Solution: In contaminated water, algal blooms can be discovered. Algae overgrowth, particularly blue-green algae, causes them (cyanobacteria). Their expansion pollutes the water supply. They breathe...
What is the nature of cell walls in diatoms?
Solution: Cell walls of diatoms are unbreakable and embedded with silica, which imparts distinctive patterns to the walls. These diatoms deposit a lot of cell wall deposits in their habitat, which...
Discuss how classification systems have undergone several changes over a period of time.
Solution: The scientific classification was initially introduced by Aristotle. He classified plants into trees, shrubs, and herbs based on simple physical characteristics. He separated the animals...
Write the differences between multimolecular and macromolecular colloids. Give one example of each. How are associated colloids different from these colloids.
(I) The colloidal particles in multi-molecular colloids are an assemblage of atoms or tiny molecules having a diameter of less than 1 nm. The molecules in the aggregate are held together by Van der...
What is an adsorption isotherm? Describe Freundlich’s adsorption isotherm.
The plot of the amount of adsorption (x/m) against the pressure of the gas (P) at constant temperature is known as the adsorption isotherm (T). Three cases arise from the graph which are as follow...