Write three examples of terrestrial ecosystem.

Give three examples of fresh water ecosystem.

Give examples of natural ecosystem

Write two examples of true fruits?

A diagrammatic representation of different trophic levels in an ecosystem is given below Give example of the organism for each trophic level either from aquatic or terrestrial ecosystem.

Give a schematic representation of nitrogen cycle of a terrestrial ecosystem? Name any two micro-organisms involved in it?

Give three examples of irreversible changes?

Write two examples of carcinogens.

Give three examples of false fruits.

Give three examples of polymeric substrances.