Question

"Energy flow in a food chain is always unidirectional". justify this statement.

Answer 1

1.Because the energy moves progressively through the various trophic levels and is no longer available to the previous trophic level. The energy captured by autotrophs does not revert back to the solar input.
2.Pesticides, used for crop rotection when washed down into the soil/water body, are absorbed by the plant/producer along with water and minerals.
3.Being non-biodegradable these chemicals get accumulated progressively in the food chain and enter our body.

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Answer 2

I am telling it in my simple words .........

in the simple food chain of
Grass ----------> Deer ---------> Lion
Yes , The energy flow is always unidirectional as in this food chain first the deer eats graas and then the deer ia eaten by lion but if we get it reverse the food chain does not exist as the grass can not eat deer and deer can't eat the lion thus, the statement is proved that “Energ flow in food chain is always uni-directional . ”

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