Question

Which action is prevented by the cell membrane?

A) unlimited flow of water into or out of the cell
B) unlimited flow of heat into or out of the cell
C) the flow of oxygen into or out of the cell
D) the flow of light into or out of the cell

Answer 1

Unlimited flow of water into or out of the cell is prevented by the cell membrane

Explanation:

• The plasma or cell membrane is the barrier that isolates inner cell from surrounding environment.
• It prevents the entry of all unnecessary molecules that are harmful for the cell, permitting some of them to enter the cell.
• t is also considered as semi permeable. It allows oxygen and carbon di oxide at a slow rate as they are necessary for the functioning of the cell.
• However, it allows water too but limits its way.
• Water molecules are passed by aquaporins that helps in conducting its flow inside and outside the cell.

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Answer 2

Amongst the following the cell membrane prevents the ‘unlimited flow of water’ into or out of the cell.

Option: A  

Explanation:  

• The ‘cell membrane’ is a selectively ‘permeable membrane’ that guards the entry and ‘exit of materials’ into and away from the cell.  

• The ionic balance within the cell is maintained by this permeability.  

• The excess of intake of water and the exit of water from the cell should be monitored to avid the bursting of cells due to excess water intake.

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