Discussion
Pyramid of energy in a forest ecosystem is
Answer: D
The pyramid of energy is always upright.
Each trophic level passes on only about 10% of the energy it receives to the next, the rest being lost as heat in respiration. Energy flow at each higher level must therefore be smaller than at the level below, in any ecosystem.
Pyramids of number or biomass can be inverted: a forest has few large trees supporting many insects, so its pyramid of numbers is spindle shaped or inverted. But energy cannot increase up the chain, so the energy pyramid is never inverted, spindle shaped or dumb-bell shaped.
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