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Which plant hormone is responsible for apical dominance, and what is an example of a naturally occurring form of it?

1. Apical dominance is regulated by auxins, with Indole-3-acetic acid (IAA) being a natural example.
2. Abscisic acid acts as a stress hormone, helping conserve water by closing stomata during drought conditions.
3. Cytokinins, such as zeatin found in corn (Zea mays), primarily promote cell division.
4. According to Thimann and Skoog, auxins produced in the apical meristem move downward, suppressing lateral bud growth, which explains why trimming grass promotes uniform growth.

Correct answer: Apical dominance is regulated by auxins, with Indole-3-acetic acid (IAA) being a natural example.

Solution

Option A is correct because it directly states the role of auxins, specifically IAA, in causing apical dominance, which is a well-established fact in plant physiology.

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