Question

Why is Plasma membrane called as selectively permeable membrane?

Answer 1

Plasma membrane or cell membrane allows or permits the entry and exit of some useful materials in and out of the cell and also prevents the entry of some other necessary materials through it. Hence,it is called a selectively permeable membrane.
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Answer 2

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• Plasma membrane of the cell allows only the movement of certain selected molecules across it. It contains various types of gates and channels which facilitate the movement of only selected molecules. So, it is called a selectively permeable membrane.