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SS2: BIOLOGY - 3RD TERM

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  1. Pollution | Week 1
    3 Topics
  2. Pollution II | Week 2
    3 Topics
    |
    1 Quiz
  3. Conservation of Natural Resources | Week 3
    6 Topics
    |
    1 Quiz
  4. Pests and Diseases of Crops | Week 4
    4 Topics
  5. Control of Pests | Week 5
    3 Topics
    |
    1 Quiz
  6. Reproductive System in Vertebrates I | Week 6
    5 Topics
    |
    1 Quiz
  7. Reproductive System in Vertebrates II (Mammals)| Week 7
    4 Topics
    |
    1 Quiz
  8. Reproductive System in Vertebrates III (Comparison of Reproduction in Vertebrates) | Week 8
    4 Topics
    |
    1 Quiz
  9. Reproductive System in Plants | Week 9
    2 Topics
    |
    1 Quiz
  10. Pollination in Plants | Week 10
    4 Topics
    |
    1 Quiz



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Topic Content:

  • Meaning of Placentation
  • Types of Placentation

Placentation refers to the arrangement or the position of ovules in the ovary. The ovules are found in chambers called loculi (sing. loculus) which may be separated from one another by partitions known as septa. The ovules in the chambers are attached to the placenta which can be found at the centre of the ovary or along the ovary wall.

An ovule is attached to the placenta by a short stalk called the funicle.

Types of Placentation:

 

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