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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:

  • Theory Questions & Answers – Theory Questions – The Cell and its Environment

Theory Questions – The Cell and its Environment:

1. a. Define the following terms; Osmosis and diffusion.

b. State three differences between Osmosis and Diffusion.

c. Mention three biological significance of osmosis in living things.

d. Describe an experiment to demonstrate the process of osmosis in a living tissue.

 

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Theory Questions – The Cell and its Environment

1. a. Define the following terms; Osmosis and diffusion.

Answer:

(i) Osmosis is the movement of water molecules from a dilute solution to a concentrated solution through a semi-permeable membrane.

(ii) Diffusion is the movement of molecules of a substance from a region of higher concentration to a region of lower concentration down a gradient.

 

b. State three differences between Osmosis and Diffusion.

Answer:

Diffusion: Osmosis:
1. Diffusion occurs in gases and liquids. Semi-permeable membrane not required.
2. Semi-permeable membrane not required. Osmosis occurs only in liquid mediums.
3. Occurs in living and non-living organisms. Occurs naturally in living organisms.

 

c. Mention three biological significance of osmosis in living things.

Answer:

Osmosis is used in the:

  • absorption of water by plants from the soil to the body.
  • reabsorption of water to the body from the urinary tubules.
  • absorption of water from undigested waste to the body in the large intestine.

 

d. Describe an experiment to demonstrate the process of osmosis in a living tissue.

Answer:

An experiment to show that Osmosis takes place in a living tissue.

Aim: To show that Osmosis takes place in a living tissue

Apparatus/Materials: Water trough, Sugar, Yam tuber

Method:

(i) Remove skin of the yam tuber of about 6 cm in length.

(ii) Make a cavity in the Centre.

(iii) Place yam in a trough containing water.

(iv) Add Sugar solution into the yam cavity.

(v) Mark the levels of sugar solution in yam cavity and the level of water in the trough.

(vi) Allow the set-up to stand for some hours

Observation: The level of sugar solution in the yam cavity increased while the level of water in the yam cavity in the control experiment did not rise.

Conclusion: The yam tissues acted as a semi-permeable membrane through which water molecules moved from the trough to the yam cavity. Therefore, Osmosis has taken place.

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