Question

What are trophic levels? Give an example of a food chain and state the different trophic levels in it.

Answer 1

Explanation:

The various links or steps in a food chain at which the transfer of food and energy takes place are called trophic levels.

The producers form the first trophic level as they manufacture of food. The primary consumers from the second trophic level, the secondary consumers from the third and the tertiary consumers from the fourth trophic level.

Eg. Grass is the producer which is eaten by the grasshopper know as the primary consumers. Then the Grasshopper is eaten by shrew, secondary consumers and lastly shrew is eaten up by owl, tertiary consumers.

Answer 2

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Trophic Levels : The various steps in a food chain at which the transfer of food (or energy) takes place are called trophic levels.

Example : A food chain operating in a grassland is given below :

Grass → Insects → Frog → Birds

In this food chain

Grass represents first trophic level.

Grasshopper represents second trophic level.

Frog represents third trophic level.

Eagle represents fourth tropic level.