The plant hormone ____ appears to play a major role in gravitropism in roots and shoots.

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Auxin is the plant hormone primarily responsible for gravitropism, the growth response of plant roots and shoots to gravity. It helps to regulate the direction of growth by concentrating on the lower side of the plant organ, causing cells to elongate at different rates and thus bending the organ towards or away from gravity.

The Plant Hormone ____ Appears to Play a Major Role