Year 11 - Science
Plant defences against disease
Defences against pathogens, the human immune system and vaccination
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores the body's defences and immune response against pathogens, disease prevention, and vaccines. It covers plant defence responses, and disease detection, and evaluates scientific applications, considering personal, social, economic, and environmental implications.
Lesson Summary
You will learn to describe physical, chemical and mechanical plant defences against pathogens and pests.
Key Notes
- Plants can be infected by pathogens, such as viruses, bacteria and fungi, that cause diseases.
- Pests, including insects, can damage plants by feeding on them, and can spread pathogens that cause diseases.
- Plants have physical, chemical and mechanical defences against pathogens.
- Examples of physical, chemical and mechanical defences in plants.
Vocabulary To Learn
- pathogen: A virus, bacterium or other microorganism that causes disease.
- pest: An insect or other animal that damages plants and can spread plant pathogens.
- waxy cuticle: Waterproof coating on the surface of a leaf.
- cell wall: Structure made of cellulose that surrounds plant cells.
- antimicrobial: A substance that kills microorganisms or stops their growth.
Common Mistakes To Avoid
- Plants have no defence against pests or pathogens.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Plants can be infected by pathogens, such as viruses, bacteria and fungi, that cause diseases. Pests, including insects, can damage plants by feeding on them, and can spread pathogens that cause diseases.
2. Define this scientific word and use it in context. 'pathogen'
A virus, bacterium or other microorganism that causes disease. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Plants have no defence against pests or pathogens. Correction: Plants have physical, chemical and mechanical defences against pathogens.
More Lessons In This Unit
- Evaluating the global use of vaccination Study Guide
- Immunity and vaccination Study Guide
- Light microscopy: observing and identifying microorganisms Study Guide
- Non-specific defences of the human body against pathogens Study Guide
- Plant defences, and identifying plant diseases Study Guide
- Responses of the human immune system to specific pathogens Study Guide
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