Question

Abscisic acid regulates \underline{\hspace{2cm}

• A. Wilting of leaves and seed dormancy
• B. Cell division
• C. Cell elongation and cell wall formation
• D. Shoot elongation

Hint:

Abscisic acid (ABA) is a plant hormone that helps plants manage stress, especially under conditions like drought, by regulating processes like wilting and seed dormancy.

Answer 1

The Correct Option is A

Abscisic acid (ABA) is a plant hormone that plays a crucial role in regulating processes like seed dormancy, stomatal closure (which leads to wilting), and stress responses such as drought tolerance.

(1) Wilting of leaves and seed dormancy is a key function of ABA. During water stress or drought conditions, ABA promotes the closing of stomata, which prevents water loss and leads to wilting. Additionally, it promotes seed dormancy, preventing seeds from germinating under unfavorable conditions.

(2) Why Other Options Are Incorrect:
- Cell division is regulated by other plant hormones such as cytokinins, not primarily by ABA.
- Cell elongation and cell wall formation are primarily regulated by auxins, not ABA.
- Shoot elongation is also regulated by auxins and gibberellins, rather than ABA.

Conclusion: The correct function of abscisic acid (ABA) is to regulate wilting of leaves and seed dormancy.