Assertion Reason Test: Excretory Products & their Elimination - NEET MCQ

A: Kidneys are retroperitoneal in position.

R: Kidneys are covered with peritoneum only on the ventral surface.

A: Uric acid produced by the metabolism of purine and pyrimidine.

R: Uric acid has high toxicity and soluble in water.

A: In the descending limb of the loop of Henle, the urine is hypertonic, while in the ascending limb of the loop of Henle, the urine is hypotonic.

R: Descending limb is impermeable to Na+, while the ascending limb is impermeable to H₂O.

A: The final reabsorption of water from urine into the blood occurs through the collecting duct of a mammalian nephron, resulting in hyperosmotic urine production.

R: The loop of Henle is responsible for the formation of sodium gradient across the depth of the medullary intersitium of a mammalian kidney.

A: Diabetes insipidus is marked by excessive urination and too much thirst for water.

R: Anti-diuretic hormone (ADH) is synthesized by the posterior lobe of the pituitary gland.

A: Inulin is used in testing kidney function, especially glomerular filtration.

R: Inulin is a fructan storage polysaccharide.

A: Tubular secretion is of considerable importance in marine teleost fishes.

R: These have aglomerular kidney, i.e. no filtration occurs, and tubular secretion is the only way of excretion.