A) There is increase in energy of ecosystem
B) There is decrease in energy due to concentration in successive levels
C) There is decrease in energy due to loss in form of heat in each trophic level
D) There in increase in energy due to gain of heat in each trophic level.
Correct Answer: B
Solution :[b] An energy pyramid is a graphical model of energy flow in a community. The different levels represent different groups of organisms that might compose a food chain. An energy pyramid's shape shows how the amount of useful energy that enters each level - chemical energy in the form of food - decreases as it is used by the organisms in that level. The consumers at the top of a food pyramid, as a group, thus have much less energy available to support them than those closer to the bottom. That's why their numbers are relatively few in most communities. Eventually, the amount of useful energy left can't support another level. That's why energy flow is depicted in the shape of a pyramid. The energy that enters a community is ultimately lost to the living world as heat.
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