Apical dominance in plants is primarily controlled by which hormone? MCQ with Answer and Explanation

Apical dominance in plants is primarily controlled by which hormone?
A. Gibberellin
B. Ethylene
C. Cytokinin
D. Auxin
Answer: Option D
Solution (By JKSSB Mock Tests)
Apical dominance is the phenomenon where the main central stem (apical bud) grows more strongly than the side stems (lateral buds). This is primarily controlled by auxin (specifically IAA), which is produced at the shoot apex and moves downwards, inhibiting the growth of lateral buds. Removal of the apical bud promotes lateral branching.

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Correct Answer: Option B


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Question #3
Consider statements about plant stems: 1. Nodes are the regions where leaves arise. 2. Internodes are the regions between nodes. 3. All stems grow underground. Which are correct?
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Correct Answer: Option C


Explanation:
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