The growth-promoting substance that promotes stem elongation and bending toward light is produced primarily in ____.
A) root tips, traveling to the stem in the xylem
B) the center of the stem region where elongation or bending occurs
C) flowers and flower buds
D) the shoot tip
E) root tips, traveling to the stem in the phloem

Question

Quizplus · Accepted Answer

The growth-promoting substance that promotes stem elongation and bending toward light is primarily produced in the shoot tip. This substance is known as auxin, a plant hormone that plays a key role in various growth and behavioral processes in the plant's life cycle, including phototropism, the bending of plants toward light.

The Growth-Promoting Substance That Promotes Stem Elongation and Bending Toward