AP BIOLOGY

LABORATORY REVIEW

DIFFUSION AND OSMOSIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The difference between osmosis and diffusion is that
A
diffusion is passive transport, whereas osmosis is active transport
B
only in diffusion do molecules move from areas of high concentration to areas of low concentration
C
osmosis is the opposite of diffusion and only involves the movement of water
D
osmosis refers specifically to the movement of water, whereas diffusion refers to the movement of any type of molecules
Explanation: 

Detailed explanation-1: -In diffusion, particles move from an area of higher concentration to one of lower concentration until equilibrium is reached. In osmosis, a semipermeable membrane is present, so only the solvent molecules are free to move to equalize concentration.

Detailed explanation-2: -Osmosis is the movement of solvent particles from a solution that is diluted to a more concentrated one. In contrast, diffusion is the movement of particles from a higher concentration region to a region of lower concentration.

Detailed explanation-3: -Movement of water molecules along their concentration gradient through a selectively permeable membrane is known as osmosis whereas diffusion is the net passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration.

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