Explain why the height of the solution in the thistle tube increased during the 25-minute period

Because osmosis occurred. Osmosis is the spontaneous net movement of solvent molecules through a semi-permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides. the water goes in the membrane resulting an increase in height

Amillion dollars

Well i had the same answer, so the correct answer would be a. but in this case it would be the one with plasma membrane and cell wall circled that is next to the hairy pill type of thing.