Read the given statements and select the correct options:
Statemetn-I: The ascending limb of loop of Henle is impermeable to water.
Statemetn-II: Hence the filtrate becomes hypertonic.

Options

A. Both Statement -I and II are correct
B. Both Statement-I and II are incorrect
C. Statement-I is correct and Statement-II is incorrect
D. Statement-I is incorrect and Statement-II is correct

Answer

To analyze the given statements and determine their correctness, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Statement-I**:
- The ascending limb of the loop of Henle is impermeable to water.
- This means that water cannot pass through this part of the nephron.

2. **Understanding Statement-II**:
- The statement claims that because the ascending limb is impermeable to water, the filtrate becomes hypertonic.
- Hypertonic means that the concentration of solutes in the solution is greater than that of the surrounding fluid, leading to a lower concentration of water.

3. **Analyzing the Function of the Ascending Limb**:
- The ascending limb of the loop of Henle actively transports ions (such as sodium and chloride) out of the filtrate into the surrounding interstitial fluid.
- Since water cannot follow these ions (due to the impermeability to water), the concentration of solutes in the filtrate decreases as ions are reabsorbed.

4. **Conclusion on Filtrate Concentration**:
- As a result of the reabsorption of solutes and the inability of water to follow, the filtrate becomes hypotonic (lower concentration of solutes compared to the surrounding fluid) rather than hypertonic.

5. **Final Evaluation of Statements**:
- Statement-I is correct: The ascending limb of the loop of Henle is indeed impermeable to water.
- Statement-II is incorrect: The filtrate does not become hypertonic; it becomes hypotonic due to the reabsorption of solutes.

### Correct Option:
- The correct option based on the analysis is that Statement-I is correct, and Statement-II is incorrect.