Question

why is plasma membrane called semi- permeable membrane??​

Answer 1

Explanation:

The plasma membrane is called a selectively permeable membrane as it permits the movement of only certain molecules in and out of the cells. Not all molecules are free to diffuse. ... Consequently, the cell would die due to the disappearance of the protoplasmic material.

Answer 2

Explanation:

The plasma membrane is called a selectively permeable membrane as it permits the movement of only certain molecules in and out of the cells. ... It allows hydrophobic molecules and small polar molecules diffuse through the lipid layer, but does not allow ions and large polar molecules cannot diffuse through the membrane.