How does the hormone ethylene reduce the elongation of roots and stems?
A) It causes cellulose molecules in the cell wall to orient parallel to the main direction of growth.
B) It causes cellulose molecules in the cell wall to be randomly oriented.
C) It down-regulates auxin, which promotes elongation.
D) It reduces the extensibility of the cell wall by promoting cross-linking between cell wall components.
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A)auxin concentration
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