Why is Energy Lost When Herbivores Eat Primary Producers

Question

Why is energy lost when herbivores eat primary producers?
A) Digestion takes place so rapidly that very little energy is absorbed.
B) Most primary producers contain no usable energy for herbivores.
C) Primary producers have energy stored in indigestible substances.
D) Primary producers cannot produce once eaten.

Accepted Answer

Primary producers, such as plants, have energy stored in substances like cellulose, which is indigestible to many herbivores. As a result, a significant amount of energy is lost during digestion and is not available for use by the herbivore.