In addition to the cell wall, the water stored in a plant cell’s vacuole helps give the plant firmness and shape. When a plant is not taking in enough water from the soil through its roots, it uses up its stored water and its vacuoles shrink. When the vacuoles shrink, the plant wilts.

Which of the following is a conclusion based on the paragraph above rather than a given fact?

D. Cell walls cannot maintain a plant’s shape and rigidity when the plant lacks water.


Even though cell walls contribute to keeping a plant firm and rigid, they cannot do the job without water-filled vacuoles. This conclusion follows from the fact that a plant that lacks water will wilt.

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