4.3.3.2 plant defence systems

• What are some physical defence responses to resist invasion of microorganisms in plants?

  • Cellulose cell walls.
  • Tough waxy cuticle on leaves.
  • Layers of dead cells around stems (bark on trees) which fall off.
• what are some chemical plant defence responses in plants?

  • Antibacterial chemicals.
  • Poisons to deter herbivores
• what are some mechanical adaptations in plants to prevent the invasion of microorganisms?

  • Thorns and hairs deter animals.
  • Leaves which droop or curl when touched.
  • Mimicry to trick animals.