Plant disease

2 lessons in Infection and response.

11 exam questions · 23 marks

3.15 Detecting and identifying plant diseases The signs that a plant is diseased (stunted growth, spots, decay, growths, malformed parts, discolouration, pests), mineral deficiencies such as nitrate and magnesium, and how plant diseases are identified in the field and in the laboratory. Separate only AQA Edexcel OCR 5 questions 3.16 Plant defences How plants defend themselves against pathogens and herbivores: physical barriers (cellulose cell walls, waxy cuticle, bark), chemical defences (antibacterial chemicals and poisons) and mechanical adaptations (thorns, hairs, drooping leaves, mimicry), and plant chemicals used as medicines. Separate only AQA Edexcel OCR 6 questions