Go through the following matches
(i) Calcium - Required by meristematic and differentiating tissues
(ii) Nitrogen - Mineral element required by plants in the greatest amount.
(iii) Magnesium - Activates enzymes involved in DNA and RNA synthesis.
(iv) Iron - Mainly obtained by plants in ferrous form
Which of these are correct

Options

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

Answer

To determine which of the provided matches regarding mineral nutrition in plants are correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Calcium - Required by meristematic and differentiating tissues**
- **Analysis**: Calcium is indeed essential for the growth and development of plants. It plays a crucial role in the functioning of meristematic tissues, which are responsible for cell division and differentiation. Calcium helps maintain cell wall structure and stability, and it is also involved in signaling pathways that regulate growth.
- **Conclusion**: This statement is **correct**.

2. **Nitrogen - Mineral element required by plants in the greatest amount**
- **Analysis**: Nitrogen is a vital nutrient for plants and is a major component of amino acids, proteins, and nucleic acids. It is indeed one of the nutrients that plants require in the largest quantities. Nitrogen deficiency can severely affect plant growth and development.
- **Conclusion**: This statement is **correct**.

3. **Magnesium - Activates enzymes involved in DNA and RNA synthesis**
- **Analysis**: Magnesium is an essential macronutrient that acts as a cofactor for many enzymes, including those involved in nucleic acid synthesis. It is crucial for the stabilization of structures like ribosomes and is involved in the activation of enzymes that facilitate DNA and RNA synthesis.
- **Conclusion**: This statement is **correct**.

4. **Iron - Mainly obtained by plants in ferrous form**
- **Analysis**: Iron is an essential micronutrient for plants, and while it can exist in both ferrous (Fe²⁺) and ferric (Fe³⁺) forms, plants primarily absorb iron in the ferric form (Fe³⁺) under most soil conditions. The statement claiming that iron is mainly obtained in the ferrous form is incorrect.
- **Conclusion**: This statement is **incorrect**.

### Summary of Findings:
- **Correct Statements**:
- (i) Calcium - Correct
- (ii) Nitrogen - Correct
- (iii) Magnesium - Correct
- (iv) Iron - Incorrect

### Final Answer:
The correct matches are (i), (ii), and (iii). Therefore, the answer is that statements 1, 2, and 3 are correct.

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