Question

multiple choice question
net movement of a substance from a region where it has a higher concentration to a region where it has a lower concentration is called which of the following?

• osmosis
• diffusion
• equilibrium
• active transport
• endocytosis

Explanation:

• Osmosis is the diffusion of water across a semipermeable membrane, not just any substance.
• Diffusion is defined as the net movement of a substance from an area of higher concentration to an area of lower concentration (down its concentration gradient).
• Equilibrium is a state where the concentration is equal throughout, not the process of movement.
• Active transport moves substances against their concentration gradient (from low to high) using energy.
• Endocytosis is a process where cells take in large molecules or particles by engulfing them, not related to simple concentration - gradient - based movement of substances.

Answer:

B. Diffusion