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Leaving certificate biology

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  1. Ecology theory
    5 Topics
    |
    1 Quiz
  2. Unit 1
    Nutrient recycling
    4 Topics
    |
    1 Quiz
  3. Ecological relationships and population dynamics
    2 Topics
  4. Human impact on the ecosystem
    2 Topics
  5. Study of a grassland ecosystem
    3 Topics
  6. Responses in the Flowering Plant
    4 Topics
    |
    1 Quiz
  7. Unit 3
    Sexual reproduction in the flowering plant
    1 Topic
  8. The human reproductive system
    3 Topics
  9. The menstrual cycle
    2 Topics
  10. Pregnancy
    2 Topics
  11. The circulatory system
    4 Topics
  12. Blood
    5 Topics
  13. The heart
    5 Topics
Lesson 6, Topic 3
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Topic 3: Plant protection

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Structural features

  • Epidermis cells are closely packed to reduce water loss and prevent the entry of pathogens. The cuticle helps in both these functions.
  • Other protective features include stinging hairs on netttles and sharp thorns on roses

Chemical features

  • Plants produce a variety of chemicals to prevent them from being eaten. For example. oaks produce tannins in their leaves
  • Heat-shock proteins are produced during high temperatures to prevent plant enzymes from losing shape¬†

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