Several scientists, including Charles and Francis Darwin, Frits Went and others, demonstrated that auxins caused stems to bend toward light in a series of elaborate experiments.Went was the researcher who finally determined that bending of the stem toward light was a result of which mechanism?

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Went's experiments showed that auxin is transported to the shaded side of the plant stem, causing cells there to elongate more than those on the lighted side, resulting in the stem bending toward the light.

Several Scientists, Including Charles and Francis Darwin, Frits Went and Others