Indicate the flow of energy in an ecosystem. Why is it unidirectional ?
Justify.

Explanation

The flow of energy is an ecosystem occurs in following sequence
`"Sun"to"Producer"tounderset(("Primary consumer"))("Herbivore")tounderset(("secondary consumer"))("Carnivore")`
The flow of energy is unifirectional because of reasons given below
(i) Energy flows progressively from one trophic level to another and cannot rebert back.
Energy given out as heat is lost in the environment, it does not return to be used again
(ii) Also, the available energy decreases at higher trophic level. Out of the total energy available, at a particular trophic level, only `10%` is passed on to the next trophic level, making it impossible for rnergy to flow in the reverse direction.