Question

Which of the following best explains why the number of organisms at each level decreases while moving up the energy pyramid?
A.
The animals at higher levels are more competitive, so fewer animals survive.

B.
The animals at higher levels move more than animals at lower levels, so they require more energy.

C.
The animals at each level have more predators, so they produce more offspring.

D.
The animals at each level use energy, so only a small amount of their energy is available to the next level.

Answer 1

(D)........…...............…....

Answer 2

D.  The animals at each level use energy, so only a small amount of their energy is available to the next level.

Explanation:

• According to the 10% law of energy transfer, only 10% of energy will be transferred from one trophic level to the next tropic level. So the energy will decrease when it moves from lower trophic level to higher trophic level.

• Therefore there would be very little energy available to support the life of organisms present at the 3rd and 4th trophic levels. This is the reason why the number of predators is lower than the number of prey.  
• Therefore due to a decrease in energy level at successive trophic level number of organisms at each level decreases while moving up the energy pyramid.

Learn more about the 10% law of energy transfer:

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