Biology past paper question

oxygen and water move through cell surface membranes into cells.
Describe two ways in which these movements are similar:

i know its got something to do with concentration gradients does anyone have a full idea as to how to answer the question ??

unsure :s-smilie:

thanx !

Reply 1

CatnipGlows

The question is a bit oddly worded, but I can give you some help I think.

Oxygen moves by diffusion, water by osmosis.
Both involve movement of molecules from an area of high concentration to an area of low concentration. Both of these occur across a semi-permeable membrane, and they both continue until equilibrium. When equilibrium is reached, the molecules still move across the membrane, however concentration is equal on both sides.