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SS1: BIOLOGY - 1ST TERM

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  1. Introduction to Biology | Week 1
    7 Topics
    |
    2 Quizzes
  2. Recognizing Living Things | Week 2
    3 Topics
    |
    1 Quiz
  3. Organisation of Life | Week 3
    3 Topics
    |
    2 Quizzes
  4. Classification of Living Organisms | Week 4
    6 Topics
    |
    2 Quizzes
  5. Kingdom Prokaryotae / Monera & Kingdom Protista | Week 5
    4 Topics
    |
    3 Quizzes
  6. Kingdom Fungi & Kingdom Plantae | Week 6
    10 Topics
    |
    2 Quizzes
  7. Kingdom Animalia I | Week 7
    7 Topics
    |
    1 Quiz
  8. Kingdom Animalia II | Week 8
    6 Topics
    |
    2 Quizzes
  9. The Cell | Week 9
    4 Topics
    |
    1 Quiz
  10. The Cell Structure and Functions | Week 10
    5 Topics
    |
    1 Quiz
  11. The Cell and its Environment | Week 11
    5 Topics
    |
    1 Quiz
  12. Nutrition in Plants | Week 12
    5 Topics
    |
    1 Quiz
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Topic Content:

  • Plasmolysis
  • Turgidity
  • Flaccidity
  • Crenation
  • Haemolysis

Plasmolysis:

When a living plant cell is placed or surrounded in a sugar or salt solution, a more concentrated or hypertonic solution than the cell sap, water will be lost from the cell to the stronger solution resulting in exosmosis .

When the cell is left in the hypertonic solution for a long time, it will result in the pulling away of the cytoplasm from the cell wall, consequently, the cytoplasm will shrink and the cell wall will collapse. At this stage, we may say the cell is plasmolyzed .

Plasmolysis is the shrinking of the cytoplasm away from the cell wall when plant cells are immersed in a hypertonic solution.

plasmolysis-stages-of
The phenomenon of Plasmolysis.

Turgidity:

However, if a plant cell is placed in a hypotonic solution , it behaves differently; water enters the cell by osmosis due to the fact that the cytoplasm solution is stronger than the water. This is called endosmosis .

As water enters 

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Halfrida
Halfrida
27/10/2022 2:38 PM

Really helpful

Micosky Mikhachev
06/03/2023 7:29 PM

Thanks alot . This helped at the last minute

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