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5.2 Plant and body defences
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Plant barriers and chemical defences

Plant barriers and chemical defences

Labelled schematic of a waxy leaf cuticle, a cellulose cell wall, and plant chemical defences deterring pathogens and pests A pathogen is a microorganism that causes disease, while a pest is an organism that damages another organism, such as an insect eating leaves. Plants cannot move away from danger, so they rely on built-in barriers and chemical defences.

5.2 Plant and body defences Lesson

  1. GCSE
  2. /Biology
  3. /5.2 Plant and body defences

Step-by-step lessons covering Edexcel GCSE Biology 5.2 Plant and body defences for Foundation and Higher tier. Each lesson breaks down 5.2.1 Physical plant defences, 5.2.2 Chemical plant defences, 5.2.3 Detecting plant diseases, and 5.2.4 Human physical and chemical defences, then works through exam-style questions in Paper 1 and Paper 2 format. Start with the foundational topics and build up to the higher-tier material.