When Auxin Accumulates on the Lower Side of the Shoot

Question

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

Accepted Answer

Auxin promotes cell elongation in plant shoots, and when it accumulates on the lower side, it causes those cells to elongate more, leading to upward bending of the shoot.