GCSE Biology (AQA)
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Infection and Response
Plant Disease
Chemical Plant Defences
1:41
Plant Defences
Spec
4.3.3.2
- Plants use chemicals to defend against pathogens and deter herbivores.
- Damage from herbivores can create openings for pathogens and reduce the plant's photosynthetic area.
- Some plants produce antibacterial chemicals, such as garlic and mint, which kill bacteria.
- Mint is used in toothpaste due to its antibacterial properties.
- For exams, it's sufficient to know that some plants produce antibacterial chemicals without needing specific examples.
- Plants also produce chemicals that are poisonous to herbivores, such as deadly nightshade, poison ivy, and foxgloves.
- Foxgloves produce digitalis, which affects animal heartbeats and is used in heart medications.
- It's important to know that some plants produce poisonous chemicals to deter herbivores and how digitalis is used in medicine, as covered in the course.
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