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WAEC Biology 2025 Question 34

Question 34

Excretion

Urine, when compared with blood in mammals is hypertonic because

  1. A.urea is actively secreted into the renal tubules.
  2. B.much water has been removed from urine.
  3. C.urine contains high percentage of all cells.
  4. D.all traces of sugar have been removed from urine.
Show the answer and explanation

Answer: B (much water has been removed from urine.)

Explanation

As the filtrate flows along the tubule and collecting duct, much of its water is reabsorbed into the blood, so the urine left is more concentrated than blood.