Infection & ResponseDiagram

Case Study 2: Tobacco Mosaic Virus (TMV)

Part of Plant Diseases and Defenses · GCSE GCSE Biology revision

This diagram covers Case Study 2: Tobacco Mosaic Virus (TMV) within Plant Diseases and Defenses for GCSE Biology. Plant pathogens, defense mechanisms, disease identification, crop protection It is section 5 of 18 in this topic. Focus on the labels, the relationships between parts, and the explanation that turns the diagram into an exam-ready answer.

Topic position

Section 5 of 18

Practice

22 questions

Recall

21 flashcards

Case Study 2: Tobacco Mosaic Virus (TMV)

Painted diagram of tobacco mosaic virus: top panel shows a healthy bright-green tobacco leaf next to an infected leaf with the diagnostic mosaic pattern of light and dark patches; bottom panel shows a magnified close-up of rod-shaped TMV virus particles approaching a plant cell.

TMV Effects on Plant Growth

Cellular Damage

Virus disrupts cell function and chloroplast structure

Reduced Chlorophyll

Light and dark patches show chlorophyll loss

Poor Photosynthesis

Less glucose production for energy and growth

Stunted Growth

Reduced energy leads to smaller, weaker plants

Keep building this topic

Read this section alongside the surrounding pages in Plant Diseases and Defenses. That gives you the full topic sequence instead of a single isolated revision point.

Practice Questions for Plant Diseases and Defenses

What type of pathogen causes rose black spot disease?

  • A. Fungus
  • B. Virus
  • C. Bacterium
  • D. Protist
1 markfoundation

Explain how rose black spot affects the growth of infected plants.

2 marksstandard

Quick Recall Flashcards

What is rose black spot?
A fungal disease that affects roses, causing black or purple spots on leaves, which turn yellow and drop off, reducing photosynthesis.
What is a plant pathogen?
A microorganism that causes disease in plants, such as fungi, bacteria, or viruses.

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