Which of the following is a set of secondary metabolites produced by plants for defence?

Strychnine and fructose

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Nicotine and tyrosine

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Ricin and glucose

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Caffeine and nicotine

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Solution

The correct option is D Caffeine and nicotine
Caffeine, strychnine and nicotine are produced by plants for defence. Glucose, tyrosine and fructose are not secondary metabolites. They are primary metabolites as they have recognised function.

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