Question

(4) Plasma membrane is called a selectively permeable membrane. justify​

Answer 1

Plasma membrane is porous and allows the entry and exit of selected substances It also prevents the movement of some other substances across it. Thus, it is also called selectively permeable membrane.

$\sf \: \green{Extra \: information \: : }$

Every cell is bound by a thin delicate membrane called Plasma membrane or Cell membrane.

$\sf \purple{\underline{Functions \: of \: Plasma \: membrane \: are} : }$

(1). It provides an outer boundary to the cell and seperates cell from one another and also from the surrounding medium.

(2). It also protects the cell from injury.

In addition, the plant cell and bacterial cell have an outer wall surrounding the cell membrane. This wall is called cell wall. The cell wall in plant cell provides protection against atmospheric moisture, temperature variations and high wind speed.

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.