Year 11 - Science
Plant defences, and identifying plant diseases
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, and can describe ways in which plant diseases can be identified.
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.
- Ways to identify plant diseases and the pathogens that cause them.
Vocabulary To Learn
- 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.
- microscopy: Use of a microscope to observe a specimen such as a microorganism.
- antibody: Protein produced by white blood cells against a specific pathogen.
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. 'waxy cuticle'
Waterproof coating on the surface of a leaf. 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 against disease Study Guide
- Responses of the human immune system to specific pathogens Study Guide
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