What happens each day when the leaf of a plant is first exposed to light ? (a) the epidermal cells on the upper surface of the leaf begin to photosynthesize. (b) carbon dioxide diffuses out of the leaf. (c) the cells of the spongy mesophyll begin to take up carbon dioxide, and are the only cells that are able to do so. (d) the guard cells become more turgid and the stomatal apertures open.

What happens each day when the leaf of a plant is first exposed to lig

1.	What happens each day when the leaf of a plant is first exposed to light ? (a) the epidermal cells on the upper surface of the leaf begin to photosynthesize. (b) carbon dioxide diffuses out of the leaf. (c) the cells of the spongy mesophyll begin to take up carbon dioxide, and are the only cells that are able to do so. (d) the guard cells become more turgid and the stomatal apertures open.
Answer» (d) the guard cells become more turgid and the stomatal apertures open.

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