Q24 of 163 Page 226

Define trophic level. Draw the food chain with four trophic levels.

(A)

Trophic level is the steps in a food chain where transfer of food in the form of energy takes place between organisms. At each step in a food chain is an organism that forms the trophic level.


A food chain consisting of four trophic levels



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22

What is meant by a primary consumer, secondary consumer and a tertiary consumer? Give one example of each.

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Give an example of a four step food chain operating in grassland. Name the secondary consumer in this food chain.

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What will happen if we kill all the organisms in one trophic level?

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What is the difference between the food habits of organisms belonging to the first and the third trophic levels? Give one example each of the organisms belonging to these two trophic levels.