Significance of Osmosis and Diffusion


 
 
Concept Explanation
 

Significance of Osmosis and Diffusion

  • Diffusion and Osmosis play an important role in living world. Diffusion helps in exchange of gases between cells and their environment. Single celled organisms that live in freshwater habitats gain water by osmosis. The tendency of water to pass into aquatic organisms by osmosis has to be countered to expel the excess.
  • Plants absorb water through their roots from the soil by osmosis. It is carried upwards by xylem tubes to leaves, flowers and other parts.
  • The food synthesized in leaves is distributed to different parts through phloem tissues following the principle of osmosis.
  • In plants, cell to cell diffusion of water is controlled by osmosis. Osmosis regulates the opening and closing of stomata in leaves. They are surrounded by guard cells.
  • There occur basically two types of transport in cells : Passive and Active transport.
  • Passive transport is the movement of molecules across a cell membrane from the region of lower concentration to region of higher concentration without any expenditure of energy.
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    Sample Questions
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    Question : 1

    The process of diffusion help in which of the following processes ?

    Right Option : D
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    Question : 2

    The opening and closing of stomata is controlled by which process ?

    Right Option : B
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    Question : 3

    Which of the following are correct :

    (a) In a plant cell, osmosis regulates the opening and closing of stomata in leaves.

    (b) Diffusion helps in exchange of gases between cells and their environment.

    (c) Plants absorb water through their roots from the soil by osmosis.

    Right Option : D
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