Question

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

Answer 1

Energy is trapped by producers.(from the sun)
This energy cannot be reverted back to the sun.
It steadily goes to the next tropic level. And thus energy flows constantly in only one direction.Thus,unidirectional.
Also,biological magnification is how pesticides enter human body.
That is, harmful chemical like pesticides get mixed with water or soil.Since they are non biodegradable;they get concentrated and accumulated in every trophic level.The tertiary consumers being humans get the most amount of pesticides.

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Answer 2

These are important points to be written in the Answer

# The energy lost as heat from the living organism of a food chain can not be reversed by plants in Photosynthesis

# Pesticides are Non Biodegradable