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Ascorbic acid, also known for its antioxidant properties, appears as white to pale yellow crystals or powder and dissolves in water. The L-form of ascorbic acid is widely recognized as Vitamin C. Due to its tendency to oxidize, it is utilized as a reducing agent in photographic developers and as a preservative. Which statement about plant hormones is accurate?

1. Auxins, such as Indole-3-acetic acid (IAA), play a role in apical dominance by promoting growth at the apex.
2. Abscisic acid acts as a stress hormone, being produced during water scarcity to reduce transpiration by closing stomata, thereby conserving moisture.
3. Cytokinins, like zeatin found in corn (Zea mays), are primarily responsible for stimulating cell division.
4. Research by Thimann and Skoog showed that auxins produced in the apical meristem move downward to suppress lateral bud growth, explaining why trimming grass enhances its appearance.

Correct answer: Abscisic acid acts as a stress hormone, being produced during water scarcity to reduce transpiration by closing stomata, thereby conserving moisture.

Solution

Option B correctly describes abscisic acid as a stress hormone that reduces transpiration by closing stomata during desiccation, conserving water. This aligns with its role in plant stress responses.

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