Depletion of ozone is mainly due to

In the given figure,the various trophic levels are shown in the form of a pyramid. At which trophic level is maximum energy available and at which trophic level is the maximum number of organisms present?

In a food chain,the third trophic level is always occupied by

In a food chain,the third trophic level is always occupied by

Draw a food chain which operates in a forest ecosystem.

State the direction of flow of energy in a food chain. Can food and energy from a trophic level move back to the previous level? Give reasons for your answer.