Read the following matches regarding the elements and their deficiency symptoms in plants
(i) Molybdenum - Brown heart of turnip
(ii) Potassium - Plastid disintegration
(iii) Magnesium - Underdeveloped phloem & pith
(iv) Phosphorus - Delay in seed germination
Which of these are correct

Options

A. (i), (iii) & (iv)
B. (ii), (iii) & (iv)
C. (i), (ii) & (iii)
D. (iii) & (iv) only

Explanation

To determine which of the matches regarding elements and their deficiency symptoms in plants are correct, we will analyze each statement one by one.

### Step 1: Analyze Molybdenum - Brown heart of turnip
- **Molybdenum** is an essential micronutrient for plants, but the symptom **"brown heart of turnip"** is actually associated with a deficiency of **boron**, not molybdenum. Therefore, this statement is **incorrect**.

### Step 2: Analyze Potassium - Plastid disintegration
- **Potassium** is crucial for various physiological processes in plants, including the maintenance of osmotic balance. The symptom **"plastid disintegration"** is indeed linked to potassium deficiency. Thus, this statement is **correct**.

### Step 3: Analyze Magnesium - Underdeveloped phloem & pith
- **Magnesium** is vital for chlorophyll synthesis and plays a role in enzyme activation. A deficiency in magnesium can lead to symptoms such as **"underdeveloped phloem and pith"**. Therefore, this statement is also **correct**.

### Step 4: Analyze Phosphorus - Delay in seed germination
- **Phosphorus** is essential for energy transfer and nucleic acid synthesis. A deficiency in phosphorus can lead to a **"delay in seed germination"**. Hence, this statement is **correct**.

### Conclusion
After analyzing all the statements:
- Molybdenum - Brown heart of turnip: **Incorrect**
- Potassium - Plastid disintegration: **Correct**
- Magnesium - Underdeveloped phloem & pith: **Correct**
- Phosphorus - Delay in seed germination: **Correct**

Thus, the correct matches are **Potassium, Magnesium, and Phosphorus**.

### Final Answer
The correct matches are: **2, 3, and 4**.

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