ANATOMY

Detailed explanation-1: -The cell membrane is a very thin layer of protein and fat. It allows only selective substances to pass through it, hence, it is called a selectively permeable membrane.

Detailed explanation-2: -One of the most important functions of the plasma membrane is the transport of the molecules across it. The membrane is selectively permeable to some molecules present on either side of it. Thus option A is the correct answer.

Detailed explanation-3: -The most important thing about membranes is that they regulate what moves in and out of a cell. The membrane is selectively permeable because substances do not cross it indiscriminately. Some molecules, such as hydrocarbons and oxygen can cross the membrane.

Detailed explanation-4: -Note: The most suitable example of selective membrane is plasmalemma as this cell membrane is considered to be a synonym to permeable membrane. The plasmalemma works as a separator of the interior of a cell from the outer environment.