Question

Assertion (A): The number of trophic levels in the grazing food chain is restricted.

Reason (R): Only 10 percent of the energy is transferred to each trophic level from the lower trophic level.

• A. Both A and R are correct and R is the correct explanation of A.
• B. Both A and R are correct and R is not the explanation of A.
• C. A is correct and R is incorrect.
• D. Both A and R are incorrect.

Answer 1

The correct option is A Both A and R are correct and R is the correct explanation of A.

According to ten percent law, out of the total energy entering a particular trophic level of organisms, only 10 percent is available for transfer to the next higher trophic level. The length of food chains is limited because, by the time we get to the 4th or 5th trophic level, very little energy is available that is transferred to the higher trophic level.