Carrier ions like `Na^(+)` required for the absorption of

Options

A. Fructose
B. Glucose
C. Chloride ions
D. Water

Answer

To solve the question regarding which substance requires carrier ions like `Na^(+)` for absorption, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Carrier Ions**: Carrier ions are essential for the absorption of certain substances in the body. Sodium ions (`Na^(+)`) are one of the key carrier ions involved in this process.

2. **Identifying the Absorption Process**: The absorption of glucose in the intestines is a well-known process that involves sodium ions. This process is called co-transport or secondary active transport.

3. **Mechanism of Glucose Absorption**: In the small intestine, glucose is absorbed through the intestinal epithelial cells. Sodium ions are actively transported out of these cells, creating a gradient. This gradient allows sodium to flow back into the cells along with glucose, which is co-transported with sodium through specific carrier proteins.

4. **Evaluating Other Options**:
- **Fructose**: While fructose is also absorbed in the intestines, it does not require sodium ions for its absorption; it uses a different mechanism.
- **Iron**: Iron absorption does not involve sodium ions.
- **Chloride Ions**: Chloride ions do not require sodium ions for absorption.
- **Water**: Water is absorbed primarily by osmosis and does not depend on sodium ions.

5. **Conclusion**: Based on the above analysis, the correct answer to the question is that carrier ions like `Na^(+)` are required for the absorption of glucose.

### Final Answer:
**Glucose**