3.2 Plant defence responses

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Biology

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Physical defence responses

  • Cellulose cell walls.
  • Tough waxy cuticle on leaves.
  • Layers of dead cells around stems (bark on trees) which fall off.
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Chemical plant defence responses.

  • Antibacterial chemicals
  • Poisons to deter herbivores.
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Mechanical adaptations

  • Thorns and hairs deter animals.
  • Leaves which droop or curl when touched.
  • Mimicry to trick animals.
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how do physical defences prevent infections

create a barrier to resist microorganisms