In root, the region of fastest growth is

Options

A. Root hair zone
B. Behind the root rip
C. Root tip
D. Before the root tip.

Answer

To answer the question "In root, the region of fastest growth is," we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Parts of the Root**: The root is divided into several regions, including the root tip, the zone of elongation, and the root hair zone.

2. **Understand the Function of Each Region**:
- **Root Tip**: This is the very end of the root and contains meristematic cells.
- **Zone of Elongation**: This area is where cells that have been produced by the root tip begin to elongate.
- **Root Hair Zone**: This is where root hairs develop to increase surface area for absorption.

3. **Focus on the Root Tip**: The root tip is crucial because it contains meristematic cells that are responsible for rapid cell division (mitosis). This is where new cells are produced for root growth.

4. **Conclusion**: Since the root tip is where the most rapid growth occurs due to the presence of meristematic cells and active mitosis, it is the region of fastest growth in the root.

5. **Final Answer**: The region of fastest growth in the root is the **root tip**.