Q3 of 14 Page 22

Answer the following:

What is an ecosystem?

Ecosystem is the area where living organisms interact with other living organisms and with non-living things (water, soil, sunlight etc) in that area.


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3

Answer the following:

List the factors which have made life exist on earth.

 3

Answer the following:

Define the following-


a. Lithosphere


b. Population


c. Biotic community


d. Food web


e. Trophic level

 3

Answer the following:

Why is the use of DDT not advisable?

 3

Answer the following:

Construct a simple food chain.