In a longitudinal section of a root, starting from the tip upward, the four zones occur in the following order

Options

A. Root cap, cell division, cell enlargement, cell maturation
B. Root cap, cell division, cell maturation, cell enlargement
C. Cell division, cell enlargement, cell maturation, root cap
D. Cell division, cell maturation, cell entlargement, root cap.

Answer

To answer the question regarding the order of the four zones in a longitudinal section of a root, we will analyze the structure of the root from the tip upward. Here’s a step-by-step breakdown:

### Step-by-Step Solution:

1. **Identify the Root Cap**:
- At the very tip of the root, we first encounter the root cap. This structure protects the underlying meristematic tissue as the root pushes through the soil.

2. **Apical Meristem**:
- Just above the root cap is the apical meristem. This region is responsible for cell division, where new cells are produced. The cells in this area divide rapidly, typically every 12 to 36 hours.

3. **Zone of Elongation**:
- Moving upward from the apical meristem, we reach the zone of elongation. In this zone, the newly formed cells begin to elongate, which contributes to the growth of the root.

4. **Zone of Maturation**:
- Finally, we arrive at the zone of maturation. In this region, the elongated cells differentiate into specific cell types, such as epidermal cells, cortex cells, and root hairs. The root hairs are crucial for the absorption of water and nutrients.

### Order of the Zones:
- **Root Cap**
- **Apical Meristem (Zone of Cell Division)**
- **Zone of Elongation**
- **Zone of Maturation**

### Final Answer:
The four zones in a longitudinal section of a root, starting from the tip upward, occur in the following order:
1. Root Cap
2. Apical Meristem (Zone of Cell Division)
3. Zone of Elongation
4. Zone of Maturation

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