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Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their

1. Growth response
2. Defence action
3. Effect on reproduction
4. Nutritive value

Correct answer: Defence action

Solution

Nicotine, strychnine, and caffeine are secondary metabolites that often act as chemical defenses. They help plants reduce damage by making tissues toxic, bitter, or otherwise unpalatable to attackers.

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