Go through the following matches
(i) Copper - Absorbed as cuprous ions
(ii) Molybdenum - Component of nitrate reductase
(iii) Chlorine - Needed in synthesis of auxin
(iv) Boron - Required for uptake and utilization of `Ca^(2+)`
Which of these are correct:

Options

A. (i), (ii) & (iii)
B. (ii), (iii) & (iv)
C. (ii) & (iv)
D. All are correct

Explanation

To determine which of the matches are correct, let’s analyze each statement step by step:

### Step 1: Analyze Copper
- **Statement**: Copper - Absorbed as cuprous ions.
- **Explanation**: Copper exists in two forms: cuprous ion (Cu⁺) and cupric ion (Cu²⁺). However, plants primarily absorb copper in the form of cupric ions (Cu²⁺), not cuprous ions (Cu⁺).
- **Conclusion**: This statement is **incorrect**.

### Step 2: Analyze Molybdenum
- **Statement**: Molybdenum - Component of nitrate reductase.
- **Explanation**: Molybdenum is indeed a crucial component of the enzyme nitrate reductase, which is involved in the reduction of nitrate to nitrite in plants. It also plays a role in nitrogen fixation as part of nitrogenase.
- **Conclusion**: This statement is **correct**.

### Step 3: Analyze Chlorine
- **Statement**: Chlorine - Needed in synthesis of auxin.
- **Explanation**: The synthesis of auxins, which are plant hormones, primarily requires zinc rather than chlorine. Chlorine is more associated with osmoregulation and photosynthesis.
- **Conclusion**: This statement is **incorrect**.

### Step 4: Analyze Boron
- **Statement**: Boron - Required for uptake and utilization of Ca²⁺.
- **Explanation**: Boron is essential for the uptake of calcium ions (Ca²⁺) and plays a vital role in cell division and the structural integrity of plant cell walls. Without boron, calcium uptake is impaired.
- **Conclusion**: This statement is **correct**.

### Final Conclusion
Based on the analysis:
- **Correct Matches**:
- (ii) Molybdenum - Component of nitrate reductase (Correct)
- (iv) Boron - Required for uptake and utilization of Ca²⁺ (Correct)

- **Incorrect Matches**:
- (i) Copper - Absorbed as cuprous ions (Incorrect)
- (iii) Chlorine - Needed in synthesis of auxin (Incorrect)

### Summary of Correct Matches
The correct matches are:
- Molybdenum is a component of nitrate reductase.
- Boron is required for the uptake and utilization of calcium.