The primary growth in root is due to

Options

A. Zone of maturation
B. Zone of cell division
C. Zone of cell elongation
D. Meristematic region

Answer

**Step-by-Step Text Solution:**

1. **Understanding Primary Growth:**
- Primary growth refers to the increase in length of the plant, which occurs at the tips of roots and shoots. This growth is primarily due to the activity of specific regions in the plant.

2. **Identifying Key Zones in Roots:**
- In roots, there are several zones that play a role in growth:
- **Zone of Maturation:** This is where root hairs begin to form, and it is responsible for the absorption of water and nutrients.
- **Zone of Elongation:** In this zone, newly formed cells increase in length, contributing to the overall lengthening of the root.
- **Zone of Cell Division (Meristematic Zone):** This zone contains actively dividing cells (meristematic cells) that are responsible for producing new cells.

3. **Role of the Meristematic Zone:**
- The meristematic region is crucial for primary growth because it consists of cells that can divide and differentiate into various types of cells. This division leads to the formation of new cells that will eventually elongate and contribute to the growth of the root.

4. **Conclusion:**
- The primary growth in roots is primarily due to the activity in the **Zone of Cell Division** (also known as the Meristematic Zone). This zone is responsible for the continuous production of new cells that will elongate and contribute to the root's growth in length.

**Final Answer:**
The primary growth in the root is due to the **Zone of Cell Division**.

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