Question:
Mn toxicity develops deficiency symptoms of Ca, Mg and Fe because
Mn toxicity develops deficiency symptoms of Ca, Mg and Fe because
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Excess manganese competes with iron and magnesium for uptake and blocks the movement of calcium.
Updated On: Nov 12, 2026
- Mn competes with Fe, Mg for translocation.
- Mn stimulates Ca translocation to shoot apex.
- It causes excess absorption of Ca, Fe and Mg.
- Mn competes with Fe, Mg for uptake and inhibits translocation of calcium.
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Excess manganese shows as brown spots surrounded by chlorotic veins.
Step 2: Mechanism
Mn ions compete with Fe and Mg ions for absorption by the roots, and with Mg for binding sites on enzymes. Mn also blocks the movement of calcium to the shoot apex.
Step 3: Conclusion
So Mn toxicity produces deficiency symptoms of Fe, Mg and Ca. It competes with Fe and Mg for uptake and inhibits calcium translocation.
Final Answer:
Mn competes with Fe and Mg for uptake and inhibits calcium translocation. \[ \boxed{\text{(D) }\text{Mn competes with Fe, Mg for uptake and inhibits translocation of calcium.}} \]
Excess manganese shows as brown spots surrounded by chlorotic veins.
Step 2: Mechanism
Mn ions compete with Fe and Mg ions for absorption by the roots, and with Mg for binding sites on enzymes. Mn also blocks the movement of calcium to the shoot apex.
Step 3: Conclusion
So Mn toxicity produces deficiency symptoms of Fe, Mg and Ca. It competes with Fe and Mg for uptake and inhibits calcium translocation.
Final Answer:
Mn competes with Fe and Mg for uptake and inhibits calcium translocation. \[ \boxed{\text{(D) }\text{Mn competes with Fe, Mg for uptake and inhibits translocation of calcium.}} \]
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