Question

Choose the correct option for the flow of energy in an ecosystem.

• A. Sun $\to$ Producer$\to$ Herbivore $\to$ Carnivore
• B. Producer $\to$ Herbivore $\to$ Carnivore $\to$ Sun
• C. Herbivore $\to$ Carnivore $\to$ Sun $\to$ Producer
• D. Carnivore $\to$ Sun $\to$ Producer $\to$ Herbivore

Answer 1

The correct option is A Sun $\to$ Producer$\to$ Herbivore $\to$ Carnivore

• The flow of energy in an ecosystem occurs in the following sequence

Sun $\to$ Producer $\to$ Herbivore $\to$ Carnivore

• The flow of energy is unidirectional because of the following reasons:

(i) Energy flows progressively from one trophic level to another and cannot revert back. The energy given out as heat is lost in the environment, it does not return to be used again.

(ii) Also, the available energy decreases at a higher trophic level. Out of the total energy available, at a particular trophic level, only 10% is passed on to the next trophic level, making it impossible for energy to flow in the reverse direction.