GCSE Biology B3 - Plant defences and uses of chemicals from plants
- Created by: BethanyM
- Created on: 14-06-15 14:59
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- Plant Defences
- Types of pests and pathogens
- Plant pests - weeds can compete for resources
- Fungal pests- they cause diseases
- Animal pests- animals often cause damage to plants by eating them or trampling on them
- Insect pests- insects such as the greenfly eat plants and can spread diseases
- Responses to pests and pathogens
- CHEMICAL DEFENCES
- Cyanogen is a chemical which produces hydrogen cyanide when eaten
- We can use some of these plant chemicals for medicinal use
- Quinine, produced by the cinchona tree, can be used to treat malaria
- Digoxin, produced by foxgloves, lowers heart rate and can be used to treat heart disease
- Aspirin, from Willow Trees, is a pain-killer. It can also reduce fever and even blood clotting.
- LOCATION
- Some plants locate themselves where predators can't reach
- CHEMICAL DEFENCES
- When one plant is attacked, they release chemicals so nearby plants can prepare for attack
- Types of pests and pathogens
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