Question

multiple choice question
the net diffusion of water across a selectively permeable membrane is called ______.
active transport
osmosis
ionic diffusion
facilitated diffusion

Explanation:

To solve this, we analyze each option:

• Active transport: Requires energy to move substances against concentration gradient, not water diffusion.
• Osmosis: Defined as net diffusion of water across a selectively permeable membrane.
• Ionic diffusion: Involves movement of ions, not water.
• Facilitated diffusion: Involves transport of molecules via proteins, not specific to water.

So the correct option is osmosis.

Answer:

B. osmosis (assuming the second option is labeled B; if original labels differ, adjust, but based on the options, the correct one is "osmosis" among the given choices)