Question

only a small amount of the energy stored in food is available to the next organism in a food chain because
a there are more producers than consumers in a food chain
b there are fewer top consumers than producers in a food chain
c primary and secondary consumers compete for food
d most of the energy is used for life processes and is lost as heat

Explanation:

According to the 10% law of energy transfer in a food chain, most of the energy (about 90%) is used by an organism for its own life processes like respiration, movement, etc., and is lost as heat. Only about 10% of the energy is available for the next trophic level. Options A and B talk about the number of organisms which is not related to energy availability. Option C about competition for food is also not the reason for less energy transfer.

Answer:

D. Most of the energy is used for life processes and is lost as heat