The root cap is not used in absorption of water due to
(a) Presence of roots hairs
(b) Absence of root hairs
(c) Its presence in elongation zone
(d) None of the above

Options

A. Presence of roots hairs
B. Absence of root hairs
C. Its presence in elongation zone
D. None of the above

Answer

To solve the question "The root cap is not used in absorption of water due to:", we need to analyze the options provided and understand the role of the root cap in the context of water absorption.

### Step-by-Step Solution:

1. **Understanding the Root Cap**: The root cap, also known as the calyptra, is a protective layer of tissue at the tip of the root. Its primary function is to protect the delicate growing tip of the root as it pushes through the soil.

2. **Role of Root Hairs**: Root hairs are tiny extensions of the root's epidermal cells. They significantly increase the surface area of the root, allowing for more efficient absorption of water and nutrients from the soil.

3. **Absence of Root Hairs in the Root Cap**: The root cap itself does not contain root hairs. Since root hairs are essential for the absorption of water, the absence of these structures in the root cap means that the root cap cannot absorb water.

4. **Evaluating the Options**:
- **Option (a)**: Presence of root hairs - This is incorrect because the root cap does not have root hairs.
- **Option (b)**: Absence of root hairs - This is correct because the root cap lacks root hairs, which are necessary for water absorption.
- **Option (c)**: Its presence in the elongation zone - This is misleading because the root cap is not involved in the elongation zone's function of absorption.
- **Option (d)**: None of the above - This is incorrect since option (b) is a valid reason.

5. **Conclusion**: The correct answer is **(b) Absence of root hairs**. The root cap does not participate in the absorption of water due to the lack of root hairs.