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FreeScienceLessons · AQA BiologyPlant Disease and Defences
Key facts
Plant diseases — fill in the table
| Issue | Key facts |
|---|
| Pathogens & pests | |
| Rose black spot | |
| Tobacco mosaic virus (TMV) | |
| Nitrate deficiency | |
| Magnesium deficiency | |
| Detection | |
Plant defence mechanisms — fill in the table
| Defence type | Examples |
|---|
| Physical | |
| Chemical | |
| Mechanical | |
Exam questions — 3 questions · 11 marks
⚡ Extended questions included. Read the hint. Write in full sentences. AI marks against the AQA mark scheme.
1 markMineral deficiencyAQA 8461 style
A plant has yellow leaves and poor growth. Which two mineral deficiencies could explain these symptoms?
A Calcium and potassium deficiency
B Nitrate deficiency (stunted growth — needed for amino acids) and magnesium deficiency (yellow leaves — needed for chlorophyll)
C Phosphate deficiency only
D Potassium and calcium deficiency
4 marksPlant defence mechanismsAQA 8461 P1 style
Describe three ways in which plants defend themselves against pathogens and pests. Include physical, chemical and mechanical examples. (3 marks)
Hint: One example from each category. For each: name the defence AND explain how it protects the plant.
+40 XP
Quick recall flashcards
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