Which one of the following insecticides is of plant origin?
A
Ecdysone
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B
Rotenone
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C
Parathion
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D
Malathion
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Solution
The correct option is B Rotenone
Ecdysone is a steroid hormone secreted by the prothoracic gland that, in its active form, stimulates metamorphosis and regulates moulting in insects.
Rotenone is an odourless, colourless chemical that is used as a broad-spectrum insecticide, piscicide (fish killer), and pesticide. It occurs naturally in the seeds and stems of several plants.