This episode discusses plant defences.

Plants employ various defence mechanisms against threats such as infections and herbivores. These strategies are categorised as physical, chemical and mechanical. 

Physical defences include barriers like bark, waxy cuticles and cell walls that hinder pathogen entry. 

Chemical defences involve producing antibacterial substances or poisons to deter pests and herbivores. 

Mechanical defences, such as thorns and rapid leaf closure, physically prevent animals from feeding and can also include mimicry to ward off egg-laying.

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