Question

What does it mean for a membrane to be selectively permeable?

Answer 1

It means that it only allows certain molecules or ions to pass through it by either active or passive transportation

Answer 2

A membrane that allows certain substances to pass through it more easily that others.

Step-by-step explanation:

The selectively permeable membranes allow certain substances to pass through them easily while restricting the movement of others. Since the inner core of the plasma membrane is made of hydrophobic tails of phospholipids, it does not allow the charged, polar and large substances to pass through it and is selectively permeable.