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Assertion: In terrestrial animals,counte...

Assertion: In terrestrial animals,counter current mechanism helps in the concentration of the filtrate to pass out concentrated urine. Reason: Descending limb is impermeable to water while ascending limb is impermeable to `Na^(+)`

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertin, then mark (1)

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertin, then mark (2)

C

If Assertion is true statement but Reason is false, then mark (3)

D

If both Assertin and Reason are false statements, then mark (4)

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both the assertion and the reason provided. ### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that in terrestrial animals, the counter-current mechanism helps in the concentration of the filtrate to produce concentrated urine. - This is true because the counter-current mechanism, primarily occurring in the loop of Henle, allows for the efficient reabsorption of water and solutes, leading to the production of concentrated urine. 2. **Understanding the Reason**: - The reason states that the descending limb of the loop of Henle is impermeable to water while the ascending limb is impermeable to sodium ions (Na+). - This statement is also true. The descending limb allows water to leave but not solutes, while the ascending limb allows sodium to be reabsorbed but is impermeable to water. 3. **Evaluating the Relationship**: - Both the assertion and the reason are correct statements. However, the reason does not directly explain why the counter-current mechanism helps in concentrating urine. The assertion is about the overall function of the counter-current mechanism, while the reason describes the properties of the limbs of the loop of Henle. 4. **Conclusion**: - Since both statements are true but the reason does not correctly explain the assertion, we conclude that the assertion is correct, and the reason is also correct, but it does not support the assertion. Therefore, the correct answer is that both statements are true, but the reason is not the correct explanation for the assertion. ### Final Answer: - The assertion is true, and the reason is true, but the reason is not the correct explanation for the assertion.
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