Question

Energy flow in a food chain is unidirectional. Justify this statement. Explain how the pesticides enter a food chain and subsequently get into our body.

Answer 1

the solar energy acquired by producer then goes to consumer(10% of producer) & gets used up but the un used energy cannot be again used by producer (i.e. backflow of energy is not possible)
the 2nd part of answer is bio accumulation/bio magmification or bio concentration i.e. non degradable chemicals passing from one trophic level to another gets concentrated in the last trophic level...............