How Does the Hormone Ethylene Reduce the Elongation of Roots

question 23

Multiple Choice

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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