Which of the following is not an example of a defence used by plants against herbivores? (a) Pro...

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Which of the following is not an example of a defence used by plants against herbivores?
(a) Production of caffcinc, tannins and quininc
(b) More production of non-woody tissues
(c) Production of hairs, thorns, spines
(d) Production of hormone-like chemicals that interfere with insect metamorphosis
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