Question

plasma membrane is selectively permeable . why?
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Answer 1

$\fbox \pink {A} \fbox \blue {N} \fbox \purple {S} \fbox \green {W} \fbox \red {E} \fbox \orange {R}$

The plasma membrane is called a selectively permeable membrane as it permits the movement of only certain molecules in and out of the cells. ... As the plasma membrane acts as a mechanical barrier, the exchange of material from its surroundings through osmosis or diffusion in a cell won't take place.

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Answer 2

Answer:

because it contains proteins which only allow favourable particles to transport.