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Class X Sciences

[papers from previous years]

"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.


Pesticides enter a food chain and subsequently get into our body by a process that  the farmers use excess of pesticides to a crop and when we consume it then the excess of pesticide will be retained to the crop and it subsequently enters into our body and leads to food poisoning.
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