<p>A Level OCR Biology Communicable Diseases</p> <ul> <li>Pathogens</li> <li>Transmission of pathogens</li> <li>Plant defences against pathogens</li> <li>Secondary non-specific defences</li> <li>Specific immune response</li> </ul> <p>Highlights the <strong>key points</strong> and there are <strong>some questions</strong> at the end to test your knowledge.</p>