Question

Plasma membrane is semi-permeable. Why?​

Answer 1

Answer:

• Plasma membrane has an important function of regulation of material in and out of the cell.

• It allows only specific substances in and out of the cell.

• It helps in intake of molecules by active or passive absorption.

• Thus, it acts as a semi-permeable membrane.

Answer 2

Answer:

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