Question:
Which hormone stimulates formation of lateral and adventitious roots?
Which hormone stimulates formation of lateral and adventitious roots?
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Think of the plant hormone used in rooting powders for stem cuttings.
Updated On: Nov 12, 2026
- Auxins
- Gibberellins
- Cytokinins
- Ethylene
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
Plant growth regulators control growth and development. One of them promotes the start of roots from the main root and from stem tissue.
Step 2: Role of auxins
Auxins such as IAA, IBA and NAA induce root initiation. They form lateral roots on the main root and adventitious roots on stem cuttings.
This is why rooting powders contain auxins.
Step 3: Compare the options
Gibberellins cause stem elongation, cytokinins promote cell division and shoot buds, and ethylene promotes ripening and senescence.
Final Answer:
Auxins stimulate the formation of lateral and adventitious roots. \[ \boxed{\text{(A) }\text{Auxins}} \]
Plant growth regulators control growth and development. One of them promotes the start of roots from the main root and from stem tissue.
Step 2: Role of auxins
Auxins such as IAA, IBA and NAA induce root initiation. They form lateral roots on the main root and adventitious roots on stem cuttings.
This is why rooting powders contain auxins.
Step 3: Compare the options
Gibberellins cause stem elongation, cytokinins promote cell division and shoot buds, and ethylene promotes ripening and senescence.
Final Answer:
Auxins stimulate the formation of lateral and adventitious roots. \[ \boxed{\text{(A) }\text{Auxins}} \]
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