AP BIOLOGY

Detailed explanation-1: -Assertion :Plasma membrane is selectively permeable. Reason: It allows some solutes to pass through it readily along with solvents.

Detailed explanation-2: -Plasma membranes must allow certain substances to enter and leave a cell, while preventing harmful material from entering and essential material from leaving. In other words, plasma membranes are selectively permeable-they allow some substances through but not others.

Detailed explanation-3: -Final Answer: Cell membrane is called a selectively permeable membrane because it allows only selective molecules to pass through it..

Detailed explanation-4: -A membrane which allows certain substances to pass through it, but not others is called a selectively permeable membrane.

Detailed explanation-5: -However it does not allows the passage of solute molecules. Hence, semipermeable membrane is used during osmosis and reverse osmosis process. For example, desalination of water requires use of semipermeable membrane.