Write down a food chain:

(a) In the sea

(b) Which ends with human-beings

(c) With five links in it.

Describe an activity to show that while paper is biodegradable but plastic (say, polythene) is non- biodegradable.

Explain why, some materials are biodegradable but some are non-biodegradable.

At which trophic level a person is feeding when he is eating:

(a) Roasted chicken

(b) Bread

(c) Eggs

(d) Apple

(e) Fish

A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.

(a) Construct a food chain for the pond.

(b) How many links are there in this chain?