WAEC Biology 2025 Objective — Question 14
Question 14 of 50 from the West African Examinations Council (WAEC) Biology 2025 Objective paper, with the correct answer and a full explanation.
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Urine when compared with blood in mammals is hypertonic because
- A. Urine contains high percentage of all cells
- B. All traces of sugar have been removed from urine
- C. Urea is actively secreted into the renal tubules
- D. Much water has been removed from urineCorrect
Explanation
Urine is hypertonic compared to blood because much water has been removed from the urine in the kidneys. The kidneys filter the blood, reabsorb water and useful substances, and excrete the remaining waste and water as urine.
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