Urine formation involves three main processes, i.e., filtration, reabsorption and secretion. Filtration is a non-selective process performed by the glomerulus using the glomerular capillary blood pressure. About 1200 ml of blood is filtered by the glomerulus per minute to form 125 ml of filtrate in the Bowman's capsule per
Assertion (A): The kidneys filter exactly one-fifth of the blood pumped out by each ventricle of the heart per minute. Reason (R): On average, 1100-1200 ml of blood is filtered by the kidneys per minute.
Correct answer: C — If assertion is true but reason is false.
NCERT states “On an average, 1100-1200 ml of blood is filtered by the kidneys per minute which constitute roughly 1/5th of the blood pumped out by each ventricle of the heart in a minute.” The Assertion removes the qualifier “roughly” making it false - the proportion is approximate, not exact. The Reason is true as stated directly in NCERT. Students often miss that filtration fraction varies with physiological conditions.
MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.