Edexcel GCSE Biology

Plant disease & defences

Edexcel GCSE Biology revision on Plant disease & defences. Aligned to the Pearson Edexcel GCSE Biology 1BI0 specification. This bank has 5 practice questions on this topic.

Sample questions (3 of 5)

  1. Question 1

    Which chemical defence mechanism do plants use to deter herbivores from consuming their leaves?

    • A) Production of poisons
    • B) Waxy cuticle barrier
    • C) Thick bark formation
    • D) Cellulose cell walls
    Show answer

    Answer: Production of poisons

    While structures like bark and the waxy cuticle are physical barriers against pathogens or water loss, chemical defences are specifically evolved to make the plant taste bad or be toxic to pests. These poisons directly interfere with the herbivore's health, discouraging future consumption.

  2. Question 2

    What is the primary function of the waxy cuticle in defending a plant against pathogens?

    • A) It provides a hard surface
    • B) It acts as a physical barrier
    • C) It synthesises antibiotics
    • D) It releases toxic enzymes
    Show answer

    Answer: It acts as a physical barrier

    The waxy cuticle is a surface layer that prevents water loss and provides a physical impediment to microorganisms. It is the first line of defence that pathogens must breach to reach the delicate internal plant tissues.

  3. Question 3

    Which specific type of pathogen is responsible for causing Rose Black Spot disease?

    • A) A parasitic bacterium
    • B) A pathogenic fungus
    • C) A viral mosaic agent
    • D) A harmful insect pest
    Show answer

    Answer: A pathogenic fungus

    Rose Black Spot is a common fungal disease that affects rose plants, causing purple or black spots on leaves. The fungus weakens the plant by reducing the leaf area available for photosynthesis, which stunts growth.

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