Question

Give an example of a plant hormone that

(i) promotes growth

(ii) inhibits growth

Answer 1

(i)Auxin

1. Auxin is an example of a plant hormone that promotes the growth of the plant.
2. Auxins promote stem elongation and 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 the corresponding cells on the lighter side of the plant.

(ii)Abscisic Acid

1. Abscisic Acid is an example of a plant hormone that inhibits the growth of the plant.
2. It is a growth-inhibiting hormone.
3. ABAs act as an antagonist to GAs.
4. It inhibits plant metabolism and regulates abscission and dormancy.