Question:
Sulphur deficiency first occurs in
Sulphur deficiency first occurs in
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Remember the mobility distinction:
- Mobile nutrients (N, P, K, Mg) \(\rightarrow\) Deficiency appears on Older leaves.
- Immobile nutrients (S, Fe, Mn, Zn, Cu) \(\rightarrow\) Deficiency appears on Younger leaves.
- Mobile nutrients (N, P, K, Mg) \(\rightarrow\) Deficiency appears on Older leaves.
- Immobile nutrients (S, Fe, Mn, Zn, Cu) \(\rightarrow\) Deficiency appears on Younger leaves.
Updated On: Jul 6, 2026
- Young leaves
- Leaf sheath of older leaves
- Young stems
- Leaf blade of older leaf
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
The location of nutrient deficiency symptoms on a plant depends on the mobility of that nutrient within the vascular system (phloem).
Step 2: Detailed Explanation:
- Sulphur Mobility: Sulphur is an immobile element inside plant tissues. It is a structural constituent of amino acids (methionine, cysteine) and proteins and cannot be easily translocated from older tissues to younger growing points.
- Symptom Location: When a deficiency occurs, the plant cannot mobilize sulphur from older leaves to support new growth. As a result, chlorosis (yellowing) appears first on the young leaves (new foliage), while the older leaves remain green.
- This contrasts with mobile elements like nitrogen, where deficiency symptoms appear first on older leaves.
Step 3: Final Answer:
Sulphur deficiency symptoms are initiated first on young leaves.
The location of nutrient deficiency symptoms on a plant depends on the mobility of that nutrient within the vascular system (phloem).
Step 2: Detailed Explanation:
- Sulphur Mobility: Sulphur is an immobile element inside plant tissues. It is a structural constituent of amino acids (methionine, cysteine) and proteins and cannot be easily translocated from older tissues to younger growing points.
- Symptom Location: When a deficiency occurs, the plant cannot mobilize sulphur from older leaves to support new growth. As a result, chlorosis (yellowing) appears first on the young leaves (new foliage), while the older leaves remain green.
- This contrasts with mobile elements like nitrogen, where deficiency symptoms appear first on older leaves.
Step 3: Final Answer:
Sulphur deficiency symptoms are initiated first on young leaves.
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