Answer :
According to the 10 percent energy transfer rule, the herbivore having a biomass energy of 20000 units must have ingested 10% of the plant's energy.
10 percent energy transfer rule in ecology states that when the transfer of energy takes place from one trophic level to another, only 10% of its energy is transferred to the higher one. This acts as a limitation for the number of trophic levels a food chain can support.
Herbivores are the organisms that feed only on the plants to gain energy from the food. Th examples of such organisms are deer, cow, buffaloes, etc.
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