1. Which of the following limits the number of trophic levels in a food chain? (a) Decrease in energy at higher trophic levels (b) Sufficient food supply (c) Polluted air Water

• Soln:

Answer is (a) Decrease in energy at higher trophic levels

Explanation:

Available energy level at a particular trophic level is 10 times the energy level at next tropic level. When we reach fourth trophic level; a minute portion of energy from producer is available.