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 the elements and their deficiency symptoms in plants are correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Molybdenum - Brown heart of turnip**:
- Molybdenum deficiency leads to the accumulation of nitrates in the leaves, causing stunted growth and pale green or yellowish leaves.
- The symptom "brown heart of turnip" is actually associated with boron deficiency, not molybdenum.
- **Conclusion**: This match is **incorrect**.

2. **Potassium - Plastid disintegration**:
- Potassium is essential for various physiological processes, including osmotic regulation and enzyme activation.
- A deficiency in potassium can lead to symptoms such as chlorosis and disintegration of plastids in the leaves.
- **Conclusion**: This match is **correct**.

3. **Magnesium - Underdeveloped phloem & pith**:
- Magnesium is a vital component of chlorophyll and is crucial for photosynthesis.
- Its deficiency can lead to underdeveloped phloem and pith, as well as interveinal chlorosis.
- **Conclusion**: This match is **correct**.

4. **Phosphorus - Delay in seed germination**:
- Phosphorus is important for energy transfer and nucleic acid synthesis.
- A deficiency in phosphorus can indeed delay seed germination and affect root development.
- **Conclusion**: This match is **correct**.

### Final Conclusion:
- The correct matches are:
- (ii) Potassium - Plastid disintegration (Correct)
- (iii) Magnesium - Underdeveloped phloem & pith (Correct)
- (iv) Phosphorus - Delay in seed germination (Correct)
- The incorrect match is:
- (i) Molybdenum - Brown heart of turnip (Incorrect)

Thus, the correct options are **(ii), (iii), and (iv)**.