Question

1. water moving across a membrane is called:

a. active transport
b. osmosis
c. diffusion
d. respiration

Explanation:

To solve this, we analyze each option:

• Option a: Active transport requires energy and moves substances against concentration gradients, not specific to water across a membrane.
• Option b: Osmosis is defined as the diffusion of water across a selectively permeable membrane, matching the question’s description.
• Option c: Diffusion is the movement of particles (not specifically water) from high to low concentration.
• Option d: Respiration is a metabolic process for energy production, unrelated to water movement across membranes.

Answer:

b. osmosis