Question

Match List-I with List-II.

List-I (Element)	List-II (Occurrence/Function)
(A) Chloride	(I) Little leaf disease
(B) Zinc	(II) Regeneration of PEP
(C) Sodium	(III) Splitting of water
(D) Manganese	(IV) Nitrogen metabolism
(E) Molybdenum	(V) Interveinal chlorosis

Choose the correct answer from the options given below.

• A. (A)-(III), (B)-(II), (C)-(I), (D)-(IV), (E)-(V)
• B. (A)-(III), (B)-(I), (C)-(II), (D)-(V), (E)-(IV)
• C. (A)-(II), (B)-(I), (C)-(IV), (D)-(III), (E)-(V)
• D. (A)-(III), (B)-(II), (C)-(IV), (D)-(V), (E)-(I)

Hint:

Remember the classic enzyme-metal relationships:
- Molybdenum $\rightarrow$ Nitrate Reductase
- Zinc $\rightarrow$ Auxin Synthesis
- Chloride Manganese $\rightarrow$ Photolysis of Water

Answer 1

The Correct Option is B

Step 1: Understanding the Concept: 
Essential plant nutrients serve specific biochemical functions in plant metabolism. A deficiency in any of these elements leads to characteristic physiological disorders or symptoms. 

Step 2: Detailed Explanation: 
Let us match the elements with their specific functions and deficiency symptoms: 
- (A) Chloride $\rightarrow$ (III) Splitting of water: Chloride ($\text{Cl}^-$) is an essential cofactor for the manganese-containing oxygen-evolving complex (OEC) in Photosystem II, which catalyzes the photolysis of water. 
- (B) Zinc $\rightarrow$ (I) Little leaf disease: Zinc is required for auxin (indole-3-acetic acid) synthesis. A deficiency restricts cell elongation, causing extremely small leaves and rosetted growth ("little leaf"). 
- (C) Sodium $\rightarrow$ (II) Regeneration of PEP: In many $\text{C}_4$ and CAM plants, sodium is essential for regenerating phosphoenolpyruvate (PEP), the primary carbon acceptor. 
- (D) Manganese $\rightarrow$ (V) Interveinal chlorosis: Manganese deficiency causes a loss of chlorophyll between leaf veins, typically appearing first on middle and younger leaves. 
- (E) Molybdenum $\rightarrow$ (IV) Nitrogen metabolism: Molybdenum is a structural component of the nitrogenase and nitrate reductase enzymes, which are essential for nitrogen fixation and assimilation. 
This matches Option (B). 

Step 3: Final Answer: 
The correct combination corresponds to Option (B).