Question

Define trophic levels. At which trophic level do we find (i) secondary and (ii) tertiary consumers in a food chain? What will happen if all the organisms of a trophic level die? Give reasons to justify your answer.

Hint:

Energy flows through trophic levels — removing one level disrupts the whole chain.

Answer 1

A trophic level defines an organism's feeding position within a food chain, illustrating energy and nutrient transfer from producers to consumers.
Trophic Levels:
(i) Secondary consumers are at the third trophic level.
(ii) Tertiary consumers are at the fourth trophic level.
Impact of Trophic Level Extinction:
The death of all organisms in a trophic level disrupts the food chain. For example:
- If all secondary consumers die, primary consumers will overpopulate due to lack of predation.
- This overpopulation will lead to excessive consumption of producers (plants).
- The imbalance will cause the food chain to collapse, impacting all other levels.
Consequently, each trophic level is essential for ecological balance.