Plant roots that are in a horizontal position grow down because

A. auxins are being pulled to the upper side.
B. cells on the upper side elongate more than those on the lower side.
C. auxins are stimulating cells on the lower side to elongate more.
D. auxins are having no influence on this process.
E. statoliths are pushing auxins to the upper side.


Answer: B

Biology & Microbiology

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