Biology · AQA Paper 1
Plant Disease
How plant diseases and mineral ion deficiencies are detected and identified, and how plants defend themselves with physical, chemical and mechanical defences. Matches AQA GCSE Biology 4.3.3 (plant disease). It is for separate Biology only, so Combined Science students do not need it. The detection and identification of plant diseases is Higher tier only.
Lessons
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1
Detecting and Identifying Plant Diseases
Plants can be harmed by pathogens, pests and shortages of minerals. This lesson covers how gardeners and scientists detect and identify plant disease, and how…
8 terms -
2
Plant Defence Responses
Plants cannot run away from pathogens or from animals that eat them, so they defend themselves in other ways. This lesson covers the physical barriers…
8 terms
Key terms in this chapter
All 16, gathered from every lesson.
- Aphid
- A small insect that feeds on plant sap and can damage plants.
- Pest
- An animal that damages plants or crops.
- Stunted growth
- Poor growth, so a plant is smaller than normal.
- Chlorosis
- A yellowing of leaves, caused by too little chlorophyll.
- Nitrate ion
- A mineral ion that plants need to make amino acids and proteins.
- Magnesium ion
- A mineral ion that plants need to make chlorophyll.
- Ion deficiency
- A shortage of a mineral ion that a plant needs.
- Horticulturist
- A person who grows and looks after plants.
- Physical defence
- A barrier, such as a cell wall or waxy cuticle, that stops pathogens getting into a plant.
- Chemical defence
- A chemical, such as an antibacterial substance or poison, made by a plant to protect itself.
- Mechanical adaptation
- A feature of a plant's structure, such as a thorn, that deters animals.
- Herbivore
- An animal that eats plants.
- Cuticle
- A waxy layer on the surface of a leaf.
- Thorn
- A sharp, pointed part of a plant that deters animals.
- Mimicry
- When an organism looks like something else, to trick other organisms.
- Cellulose
- The material that makes up the cell walls of plants.