GCSE Biology (AQA)

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Barrier Plant Defences

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Infection and Response Plant Disease

Barrier Plant Defences

1:52 Plant Defences
Spec 4.3.3.2
Previous Plant Ion Deficiencies Next Chemical Plant Defences
  • Plants resist infection from pathogens through physical barriers.
  • Three examples of plant barriers to infection are:
  • 1. A tough waxy cuticle on leaves.
  • 2. Dead cells around the stem or bark.
  • 3. Cellulose cell walls.
  • The waxy cuticle on leaves acts as a barrier against infection by forming a tough protective outer layer that prevents pathogens from entering the plant.
  • Layers of dead cells around the stems, such as bark, act as a physical barrier that can shed and carry pathogens away.
  • Plant cells have cellulose cell walls that also serve as a physical barrier against pathogens, preventing them from infecting the cells.

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