Fishermen, in certain parts of the world follow a practice of beating the roots of tree along riverbanks in a manner that transfers the extract of the roots into water. This practice paralyzes fishes and makes them easy prey. The most acceptable reason for this observation is:
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Rotenone is highly toxic to fish and insects because it easily crosses cell membranes due to its lipophilic nature. However, it is poorly absorbed by the mammalian digestive tract, making it useful as a selective piscicide.