Question:
Which plant hormone promotes apical dominance?
Which plant hormone promotes apical dominance?
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If the apical bud is removed, auxin supply decreases, and lateral buds start growing, leading to bushier plants.
Updated On: Apr 22, 2026
- Gibberellin
- Cytokinin
- Auxin
- Ethylene
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The Correct Option is C
Solution and Explanation
Concept:
Apical dominance is the phenomenon in which the main central stem of a plant grows more strongly than the side branches. This occurs due to the action of plant hormones that regulate growth. Auxin is the plant hormone responsible for promoting apical dominance. It is synthesized in the apical bud (tip of the plant) and transported downward.
Step 1: Understand the role of auxin.
Auxin inhibits the growth of lateral (side) buds while promoting elongation of the main shoot.
Step 2: Mechanism of action.
Auxin moves from the apical bud downward and suppresses the growth of axillary buds, preventing branching.
Step 3: Conclusion.
Thus, auxin maintains apical dominance by ensuring the main stem grows preferentially. \[ \boxed{\text{Auxin}} \]
Apical dominance is the phenomenon in which the main central stem of a plant grows more strongly than the side branches. This occurs due to the action of plant hormones that regulate growth. Auxin is the plant hormone responsible for promoting apical dominance. It is synthesized in the apical bud (tip of the plant) and transported downward.
Step 1: Understand the role of auxin.
Auxin inhibits the growth of lateral (side) buds while promoting elongation of the main shoot.
Step 2: Mechanism of action.
Auxin moves from the apical bud downward and suppresses the growth of axillary buds, preventing branching.
Step 3: Conclusion.
Thus, auxin maintains apical dominance by ensuring the main stem grows preferentially. \[ \boxed{\text{Auxin}} \]
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