Question

Name the plant hormone which stimulates elongation of stem and expansion of leaf.

Answer 1

Auxin

1. Auxin is a plant hormone responsible for the elongation of the stem and expansion of the leaf.
2. Auxins promote stem elongation, inhibit the growth of lateral buds (maintains apical dominance).
3. They are produced in the stem, buds, and root tips.
4. Auxin moves to the darker side of the plant, causing the cells to grow larger than corresponding cells on the lighter side of the plant.