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What are the morphological and chemical ...

What are the morphological and chemical defence of plants against phytophagous insect?

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1. Thorns in acacia and cactus.
2. Store chemicals that make them sick when they are eaten, inhibit feeding or digestion, disrupts its reproduction or even kill.
Weed calotropis: They produce highly poisounous cardiac glycosides. Nicotine, caffeine, quinine, strychnine, opium are the other chemicals, which produce plant defence agianst grazers and browsers.
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