Biology

The best explanation for the student's observation is: C.Water moved into the lettuce cells by osmosis.

Explanation:

When the wilted lettuce is placed in cool water, the plant cells, which were previously losing water (causing the wilting), begin to absorb water. This process occurs by osmosis, which is the movement of water from an area of lower solute concentration (the water in the bowl) to an area of higher solute concentration (inside the lettuce cells, where there is more dissolved solute like salts and sugars).

Osmosis helps to restore the turgor pressure in the plant cells, which is the pressure exerted by the water inside the cell membrane against the cell wall. This influx of water makes the lettuce cells become more firm and crisp again.

Why the other options are incor...