40. Plant roots that are in a horizontal position grow down because
(A) cells on the upper side elongate more than those on the lower side.
(B) auxins are stimulating cells on the lower side to elongate more.
(C) auxins are being pulled to the upper side.
(D) auxins are having no influence on this process.

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統計： A(0), B(1), C(0), D(0), E(0) #4041861

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