Why cannot pesticide residues always be removed from food by washing?
Because they are accumulated within the tissues
Pesticides sprayed on crops are taken up by the plant and enter its tissues along with water and nutrients.
Residues held inside the tissues are not in contact with the wash water, so washing removes only what is left on the surface.
These residues then pass along the food chain and become more concentrated at each level, a process called biomagnification.
Hence, the answer is because they are accumulated within the tissues.
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