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

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.
A. Only (a) and (b) are correct.		B. Only (b) and (c) are correct.
C. Only (a) and (c) are correct.		D. All of these.
Right Option : D
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Question : 2

Active transport is the movement of molecules against a diffusion gradient from _______ concentration to ________ concentration.
A. Higher, Lower	B. Higher, more higher	C. Lower, more lower	D. Lower, Higher
Right Option : D
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Question : 3

Plants absorb water through their roots from the soil by _____________________.
A. Osmosis	B. Diffusion	C. Capillary action	D. None of these.
Right Option : A
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