Which of the following terms describe the movements of water molecules across a selectively permeable membrane?

Correct option is A

The correct answer is (A) Osmosis.

• Osmosis is the term that describes the movement of water molecules across a selectively permeable membrane. 
• Osmosis is the process by which water molecules move from a solution with a lower concentration of solutes to a solution with a higher concentration of solutes. This process occurs through a cell's partially permeable membrane, which only allows certain molecules or ions to cross it. 
• Factors like solute size and charge can influence the movement of water molecules during osmosis.

Incorrect options explanation:

• Diffusion is a natural process where particles move from areas of high concentration to areas of low concentration. This process occurs when particles collide with each other and change direction. Diffusion is important in biology, chemistry, and physics. 
• Exocytosis is a process that occurs when a cell moves large materials from inside the cell to the outside of the cell using small spheres of membrane called vesicles. This process is a form of active transport, meaning it uses energy.