Which of the following secondary compounds are produced by plants for the purpose of defences against grazers and browsers?
(a) Strychnine
(b) Caffeine
(c) Quinine

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(a) and (b) only

(b) and (c) only

(a) and (c) only

(a), (b) and (c)

answer is D.

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Detailed Solution

Secondary compounds produced by plants are toxic or repellent to herbivores and microbes, and help defend plants producing them. Production increases when a plant is attacked by herbivores or pathogens. Strychnine, caffeine and quinine are some secondary metabolites which help them against grazers and browsers.

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