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Defences against herbivory. Plants possess an array of unusual and powerful chemicals, including

Description
(a) alkaloids, such as nicotine in tobacco, (b) phenolics, such as tannins in tea leaves (near Mount Fuji, Japan), and (c) terpenoids in peppermint leaves. (d) Mechanical defences include plant spines and thorns, as on this shrub, Rosa multiflora.
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