Question

a head of lettuce produces 100 kcal of energy. after eating and digesting the lettuce a rabbit only has 10 kcal of energy available to it. the reason why they rabbit only gets 10 kcal of energy from the lettuce is because
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□ 90% of the energy produced by plants is available to the apex predators.
□ only 10% of the energy produced by plants is available to the primary consumers.
□ 90% of the energy is lost as heat.
□ only 10% of the energy is lost as heat.

Explanation:

In an ecosystem, the 10 - percent energy transfer rule states that only about 10% of the energy from one trophic level is passed on to the next level. The rest is lost mainly as heat during metabolic processes. Lettuce is a plant (producer) and rabbit is a primary consumer. So, only 10% of the energy of the lettuce is available to the rabbit and 90% is lost as heat.

Answer:

B. only 10% of the energy produced by plants is available to the primary consumers.
C. 90% of the energy is lost as heat.