Question

question 25
which of the following is an example of diffusion?
a soduim moving into a muscle cell from high concentration to low concentration
b water being drawn out of cells in a hypertonic solution
c water passing substances through a filter
d particles moving from low concentration to high concentration

Explanation:

• Option A: Diffusion is the movement of particles (like sodium ions) from an area of high concentration to an area of low concentration. This is a classic example of diffusion.
• Option B: Water being drawn out of cells in a hypertonic solution is osmosis (the diffusion of water across a semi - permeable membrane), not general diffusion of solutes.
• Option C: Water passing substances through a filter is a physical filtration process, not diffusion. Diffusion is a process based on concentration gradients of particles in a solution or gas.
• Option D: Movement of particles from low to high concentration requires energy (active transport), while diffusion is a passive process (no energy input) that moves particles down their concentration gradient (high to low).

Answer:

A. soduim moving into a muscle cell from high concentration to low concentration