The number of trophic levels in the grazing food chain is restricted because

Easy

A

the flow of energy is an ecosystem is unidirectional
B

the flow of energy is an ecosystem is subject to the first law of thermodynamics
C

about 90% of energy in a trophic level is lost as it passes to the next higher level.
D

every exchange of energy decreases the entropy, as per second law of thermodynamics

Solution

The number of trophic levels in the grazing food chain is restricted as the transfer of energy follows 10 per cent law – only 10 per cent of the energy is transferred to each trophic level from the lower trophic level. Every exchange of energy increases the entropy.

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