Apedia

OCR A Biology

Insects Plant Responses Herbivory  Chemical Defences Tannins Phenol

Front Plant responses to herbivory - Chemical defences
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  • tannins - phenol with bitter taste for animals and toxic for insects (bind to digestive enzymes in saliva, inactivating them)
  • alkaloids - nitrogenous compound that tastes bitter, can act as drugs (affecting metabolism of animal) e.g caffeine (toxic to fungi/insects and spreads through soil to prevent germination of other seeds to protect aginst competition)
  • terpenoids - toxins to insects and fungi

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