Question:
The treatment with ______ induces nodule formation in roots of leguminous plants.
The treatment with ______ induces nodule formation in roots of leguminous plants.
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Cytokinin = Cell division hormone → important in nodule formation in legumes.
Updated On: Jun 19, 2026
- Zeatin
- Indole-3-acetic acid
- Ethylene
- Abscisic acid
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The Correct Option is A
Solution and Explanation
Step 1: Understanding nodule formation.
Root nodulation in legumes is regulated by plant growth regulators and symbiotic interaction with Rhizobium bacteria.
Step 2: Role of cytokinin.
Cytokinins such as zeatin promote cell division and differentiation in root cortex cells, leading to nodule formation.
Step 3: Hormonal regulation.
Auxin-cytokinin balance is crucial, but cytokinin (zeatin) plays a direct role in initiating nodulation.
Step 4: Final conclusion.
Thus, zeatin induces nodule formation in leguminous roots.
Final Answer: \[ \boxed{\text{Zeatin}} \]
Root nodulation in legumes is regulated by plant growth regulators and symbiotic interaction with Rhizobium bacteria.
Step 2: Role of cytokinin.
Cytokinins such as zeatin promote cell division and differentiation in root cortex cells, leading to nodule formation.
Step 3: Hormonal regulation.
Auxin-cytokinin balance is crucial, but cytokinin (zeatin) plays a direct role in initiating nodulation.
Step 4: Final conclusion.
Thus, zeatin induces nodule formation in leguminous roots.
Final Answer: \[ \boxed{\text{Zeatin}} \]
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