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SS1: BIOLOGY - 1ST TERM

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  1. Introduction to Biology | Week 1
    6 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:

  • Definition of Osmosis
  • Experiment – Osmosis in a Non–living System
  • Experiment – Osmometer with Living Material
  • Differences between Diffusion and Osmosis
  • Key Points

What is Osmosis?

Osmosis is defined as the movement of water molecules from a region of higher water potential (dilute solution or lower concentration of the solute) to a region of lower water potential (higher concentration of the solute or concentration of the solution) through a semi-permeable/selectively permeable membrane.

OR

Osmosis is defined as the movement of water molecules from a dilute solution to a concentrated solution through a semi-permeable / selectively permeable membrane.

If a concentrated solution is separated from the dilute solution by a semi-permeable membrane, water diffuses across the membrane from the dilute solution by the process of osmosis.

The weaker solution is said to be hypotonic and the stronger solution is described as hypertonic, when both solutions have the same concentration, they are described as isotonic.

Osmosis

Osmosis provides the primary means by which water is transported into and out of cells.

Experiment – Osmosis in a Non–living System:

1. Tie a piece of cellophane paper over the mouth of a thistle funnel using a rubber band. 

 

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