Questions: Multiple Choice Question Which term is used exclusively to describe water's movement across a selectively permeable membrane? Hypotonic Active transport Diffusion Osmosis Need help? Review these concept resources.

The answer is the fourth one (D): Osmosis.

Explanation for each option:

• Hypotonic: This term describes a solution with a lower concentration of solutes compared to another solution, which can affect the movement of water but does not specifically describe the process of water movement itself.

• Active transport: This refers to the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, using energy. It is not specific to water and does not involve passive movement across a membrane.

• Diffusion: This is the general process of molecules moving from an area of higher concentration to an area of lower concentration. While diffusion can involve water, it is not exclusive to water or across a selectively permeable membrane.

• Osmosis: This is the correct term that specifically describes the movement of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

In summary, osmosis is the process that exclusively describes the movement of water across a selectively permeable membrane.