Organisms which synthesize carbohydrates from inorganic compounds by using radiant energy are called:

The decomposers in an ecosystem:

What will happen if deer is missing in the food chain given below?

Grass → Deer → Tiger

Organism of a higher trophic level which feed on several types of organisms belonging to a number of lower trophic levels constitute the:

In the following groups of materials, which group/groups contain only non-biodegradable materials ?

(i) wood, paper, leather

(ii) polythene, detergent, PVC

(iii) plastic, detergent, grass

(iv) plastic, Bakelite, DDT