Which one of the following is involved in the closing of stomata?
Correct answer: C. Abscisic acid
- A. Gibberellins
- B. Ethylene
- C. Abscisic acid
- D. Cytokinins
Explanation
The correct answer is Abscisic acid. Abscisic acid (ABA) is a plant hormone that plays a critical role in regulating the closure of stomata, particularly in response to drought stress. When plants experience water deficiency, ABA is synthesized in the leaves, leading to the closure of stomata to minimize water loss. In contrast, Gibberellins and Cytokinins are primarily involved in growth and developmental processes, while Ethylene is associated with fruit ripening and stress responses, but not specifically with stomatal closure.
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About Forms and Functions of Plants
Plant nutrition and transport cover mineral uptake, photosynthesis, xylem movement of water and minerals, and phloem translocation of sugars. Plant growth regulators include auxins, gibberellins, cytokinins, abscisic acid and ethene, whose effects on cell division, elongation, dormancy, fruit ripening and tropic responses should not be confused with mineral nutrition.
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