Which layer is found above ozone layer of the atmosphere? Mention one characteristic feature of this layer.

What are the functions of an ecosystem?

Give proper term for each of the following:

(a) Smaller constituent operational unit of biosphere.

(b) Accumulation of non-biodegradable toxic substance in the increasing order in a food chain.

Why do harmful chemicals concentrate as we go up in a food chain?

With the knowledge of energy transfer in the food chain, man can place himself at an advantageous position in the food chain. Explain.