Read the following statements carefully.
Statement A: NaCl is returned to the ascending limb of the loop of Henle from the descending limb of vasa recta.
Statement B: The osmolarity of the filtrate increases from 300 mOsmolL–1 to 1200 mOsmol L–1 as it moves down the descending limb of Henle’s loop.
Choose the correct option from the following:
1. Only statement A is correct
2. Only statement B is correct
3. Both statements A and B are correct
4. Both statements A and B are incorrect

Subtopic:  Concentration of Urine: I | Concentration of Urine: II |
 55%
From NCERT
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Assertion (A): The urinary bladder stretches as urine collects.
Reason (R): The urinary bladder is lined by transitional epithelium.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Micturition Reflex |
 65%
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Assertion (A): There is effective filtration pressure development in glomerulus.
Reason (R) Afferent arteriole is slightly wider than the efferent arteriole.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Formation of Urine: Ultrafiltration |
 64%
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Assertion (A): The descending limb of Henle's loop contain hypertonic urine  and ascending Henle's loop urine becomes hypotonic.
Reason (R): The descending Henle's loop is impermeable to Na+ and ascending Henle's loop is impermeable to water.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
 
Subtopic:  Formation of Urine | Concentration of Urine |
 83%
From NCERT
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Assertion (A): Diabetes insipidus is marked by excessive urination and too much thirst for water.
Reason (R): ADH is secreted by the posterior lobe of pituitary gland.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Disorders of Excretory System |
 73%
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Assertion (A): Glomerular filtration is an active transport.
Reason (R): Osmolarity of blood is 1200 mOsmol L-1.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Formation of Urine |
 52%
From NCERT
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Assertion (A): Glucose and amino acids in the filtrate are reabsorbed by tubular epithelial cells by active transport.
Reason (R): Glucose and amino acids are reabsorbed by sodium coupled transport in PCT.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Concentration of Urine |
 54%
From NCERT
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Assertion (A) Bilirubin is the exretory product of liver.
Reason (R): It is a byproduct of old RBCs.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Role of other Organs in Excretion |
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Assertion (A): The presence of ketone bodies and glucose is indicative of diabetes mellitus.
Reason (R): Polyketonuria is the presence of excess ketone bodies in urine.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
 
Subtopic:  Disorders of Excretory System |
 74%
From NCERT
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Assertion (A): The kangaroo rat can live in desert without drinking water.
Reason (R): They produce hypertonic urine and depend on metabolic water.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Osmoregulation |
 87%
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