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Flashcards · Biology · Plant Disease

Detecting and Identifying Plant Diseases

17 cards

  1. Which pathogen should you know for a viral plant disease?

    Tobacco mosaic virus.

  2. Which is the fungal plant disease you should know?

    Rose black spot.

  3. Which insect pest should you know?

    Aphids.

  4. Name three signs of plant disease.

    Any three of stunted growth, spots on leaves, rot, growths, malformed parts, discolouration, pests.

  5. How can plant diseases be identified?

    Gardening manual or website, laboratory tests, or testing kits with monoclonal antibodies.

  6. How does a monoclonal antibody testing kit work?

    The antibody binds to a particular pathogen and shows a colour change.

  7. What are nitrate ions needed for?

    To make amino acids, and then proteins, for growth.

  8. What does a lack of nitrate cause?

    Stunted growth.

  9. What are magnesium ions needed for?

    To make chlorophyll.

  10. What does a lack of magnesium cause?

    Chlorosis (yellow leaves).

  11. What is chlorosis?

    Leaves turning yellow because there is too little chlorophyll.

  12. Why does a plant with chlorosis photosynthesise less?

    It has less chlorophyll to absorb light.

  13. How can a deficiency be treated?

    By adding a fertiliser with the missing ion.

  14. Why are pests a sign of disease?

    Their presence can harm the plant and spread pathogens.

  15. Which detection and identification methods are Higher tier?

    The list of signs and the methods of identification.

  16. Three plants with a pointer marked X to the yellow leaves of the third plant. Name the problem shown by the plant marked X and state its cause.

    Chlorosis, which is yellow leaves. It is caused by a lack of magnesium ions, which are needed to make chlorophyll.

  17. Three plants with no labels. Describe the symptoms and causes shown. The same three plants with their labels.

    Healthy plant. Nitrate deficiency: stunted growth, because nitrate is needed for proteins. Magnesium deficiency: yellow leaves (chlorosis), because magnesium is needed for chlorophyll.