Which is essential for root hair growth
Or
The mineral present in cell wall is

Options

A. K, Mg and Ca
B. Na , k and Mg
C. Ca,Fe and CO3
D. Mn,Ca and Fe

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the essential minerals for root hair growth and those present in the cell wall. Both aspects are interconnected, as certain minerals play roles in both functions.

2. **Identifying Key Minerals**: The minerals that are commonly associated with root hair growth include:
- Calcium
- Potassium
- Magnesium

3. **Role of Calcium**: Calcium is crucial for root hair growth as it promotes the formation of new roots. It is also a significant component of calcium pectate, which is found in the cell wall, contributing to its rigidity and protection.

4. **Role of Potassium**: Potassium aids in the absorption of water and nutrients from the soil through osmosis. It is essential for the overall growth of root hairs and is also present in the cell wall.

5. **Role of Magnesium**: Magnesium is vital for the formation of chlorophyll, which is necessary for photosynthesis. It also supports root growth and is present in the cell wall.

6. **Evaluating Options**: The options given were:
- Potassium
- Magnesium
- Calcium
- Sodium
- Potassium, Magnesium, Calcium
- Iron and CO3
- Manganese, Calcium, Iron

The correct option is **Potassium, Magnesium, and Calcium**, as they are all essential for root hair growth and are present in the cell wall.

7. **Conclusion**: The essential minerals for root hair growth and those present in the cell wall are Calcium, Magnesium, and Potassium.