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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:

  • Excretory System in Earthworms

Nephridia are the excretory tubules in Earthworms. A pair of nephridia is present on each segment of the earthworm. They function like the kidneys in mammals.

Earthworm nephridia e1700150280892
Dorsal dissection of 7 segments of earthworm showing the arrangement of the nephridia.

A nephridium has a ciliated funnel known as the nephrostome, which opens into long coiled tubules and a coelomic cavity.

 

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