Question

Abscisic acid controls

• A. cell division
• B. leaf fall and dormancy
• C. shoot elongation
• D. cell elongation and wall formation.

Answer 1

The Correct Option is B

Abscisic acid is a plant hormone primarily associated with growth inhibition and stress responses. It plays a significant role in various physiological processes in plants.

Let's examine each of the given options and determine the correct association with abscisic acid:

1. Cell division: This process is mainly regulated by cytokinins and auxins. Abscisic acid does not promote cell division; in fact, it often acts as a growth inhibitor.
2. Leaf fall and dormancy: This is a process directly influenced by abscisic acid. The hormone promotes leaf abscission and bud dormancy to help the plant conserve water and energy during unfavorable conditions, such as drought or winter.
3. Shoot elongation: This growth process is generally promoted by gibberellins. Abscisic acid counters these effects by inhibiting shoot growth.
4. Cell elongation and wall formation: Similarly, these processes are primarily controlled by auxins, which promote cell expansion. Abscisic acid does not directly contribute to cell elongation or wall formation.

Based on the analysis above, the correct answer is that abscisic acid controls leaf fall and dormancy. This is because abscisic acid helps the plant enter a state of dormancy under stress conditions, making it crucial for plant survival in adverse environments.