Test: AP Biology

1.

Of the following answer choices, which most accurately describes the mechanism that the stems of plants use to grow toward light?

Contractile cells on the light side of the stems dictate the growth toward light

The growth of the stem is determined by metabolic processes, which are stimulated by light striking the stems

Photosynthetic processes dictate the growth

The plant will grow away from other plants so as to minimize competition

Cells on the darker side of the stem elongate more than cells on the lighter side

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