Question

"Energy flow in food chains is always unidirectional ". Justify the statement.

Answer 1

The flow of energy in food chain in unidirectional because the sun is the only source of energy for all ecosystems on earth. Then the energy is captured by the autotrophs does not revert back to the sun. Therefore, in the food chain, the energy moves progressively through various trophic levels. The energy is no longer available to the previous trophic levels.