AP BIOLOGY

Detailed explanation-1: -The Correct Answer is 10%. The amount of energy at each trophic level decreases as it moves through an ecosystem. 10 percent of the energy at any trophic level is transferred to the next level and the rest is lost largely through metabolic processes as heat.

Detailed explanation-2: -On average, only about 10 percent of energy stored as biomass in a trophic level is passed from one level to the next. This is known as “the 10 percent rule” and it limits the number of trophic levels an ecosystem can support.

Detailed explanation-3: -The reason for this is that only around 10 per cent of the energy is passed on to the next trophic level. The rest of the energy passes out of the food chain in a number of ways: it is released as heat energy during respiration. it is used for life processes (eg movement)

Detailed explanation-4: -The 10% Rule means that when energy is passed in an ecosystem from one trophic level to the next, only ten percent of the energy will be passed on. An energy pyramid shows the feeding levels of organisms in an ecosystem and gives a visual representation of energy loss at each level.

Detailed explanation-5: -Final answer: In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of chemical energy.