When Auxin Accumulates on the Lower Side of the Root

Question

When auxin accumulates on the lower side of the root of a germinating seed, it
A) increases cell elongation on the lower side of the root
B) decreases the use of energy by the cells in the root.
C) has no effect on the root; it affects only the developing shoot.
D) increases the use of energy by the cells in the root.
E) decreases cell elongation on the lower side of the root.

Accepted Answer

Auxin inhibits cell elongation in roots, causing the lower side to grow slower, which results in the root bending downwards due to differential growth rates.