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SS2: BIOLOGY - 2ND TERM

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  1. Mechanism of the Respiratory System | Week 1
    6 Topics
    |
    2 Quizzes
  2. Mechanism of Gaseous Exchange in Plants | Week 2
    1 Topic
    |
    1 Quiz
  3. Excretory Systems I | Week 3
    5 Topics
    |
    1 Quiz
  4. Excretory Systems II | Week 4
    4 Topics
    |
    3 Quizzes
  5. Nutrient Cycling in Nature I | Week 5
    3 Topics
  6. Nutrient Cycling in Nature II | Week 6
    2 Topics
    |
    1 Quiz
  7. Ecological Management | Week 7
    4 Topics
  8. Ecological Tolerance | Week 8
    2 Topics
    |
    1 Quiz
  9. Adaptation | Week 9
    3 Topics
    |
    1 Quiz
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Topic Content:

  • Structure of the Stomata
  • Mechanism of Gaseous Exchange through the Stomata of Plants
  • Lenticel

Plants do not have a specialized respiratory organ. Gaseous exchange in plants occurs through the stomata in the leaves, and lenticels in the stems.

Structure of the Stomata:

1. The stomata are found in the epidermis of the leaves. It can be found in both the lower and upper epidermis. They are more abundant in the lower epidermis which prevents excess water loss.

2. The stomata consists of minute pores called stoma, surrounded by a pair of guard cells.

3. The cell wall surrounding the stoma is tough, flexible and thin.

 

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