Glucose is reabsorbed in the renal tubule by :

Options

A. active transport
B. osmosis
C. diffusion
D. secretion

Explanation

**Step-by-Step Solution:**

1. **Identify the Location of Glucose Reabsorption:**
- Glucose is primarily reabsorbed in the proximal convoluted tubule (PCT) of the nephron in the kidneys.

2. **Understand the Mechanism of Reabsorption:**
- The process by which glucose is reabsorbed involves the movement of glucose molecules across the cell membrane of the renal tubule cells.

3. **Determine the Concentration Gradient:**
- Glucose is reabsorbed from a lower concentration in the tubular fluid to a higher concentration in the renal tubule cells. This means it is moving against the concentration gradient.

4. **Identify the Type of Transport:**
- Since glucose is moving against the concentration gradient, this process requires energy. The type of transport that allows this movement is known as active transport.

5. **Conclusion:**
- Therefore, glucose is reabsorbed in the renal tubule by active transport.

**Final Answer: Active Transport**

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