B) a natural herbicide
C) An insect hormone
D) a natural insecticide
Correct Answer: D
Solution :[d] Rotenone is a colourless, crystalline ketonic compound which is soluble in organic solvent such alcohol, ether but insoluble in 'water, weak acid and weak base. It is a valuable natural insecticide. It was first isolated from Derris in 1902, by Kazuo Nagai.
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