Question

If the plankton contain 100,000 kcal of energy, about how much energy will the manta ray obtain from eating the starfish?

Answer 1

The Answer is B 100 kcal
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Answer 2

Answer B. 100 kcal

Energy transfer in the food chain, follows 10% law. Only 10% of the available energy gets transferred to the next trophic level, major part of rest of energy is lost to the environment as heat. In the stated food chain, plankton are the producer have 100,000 kcal of energy, only 10 % of this energy that is 10,000 kcal transferred to next trophic level which is occupied by clams, oysters, mussels. Starfishes feed on clams, oysters, mussels get 1000 kcal of energy and manta ray fish, a top consumer eats starfish gets 100 kcal, i.e., 10% energy available at starfish.