Waec Model Questions Vol1 2025 Biology Question 31
Practice objective / multiple choice question 31 from the 2025 Waec Model Questions Vol1 Biology examination.
In a healthy adult, the kidneys filter 180 L of plasma each day. Of the filtered water, 99 % is re‑absorbed, and the filtered plasma contains urea at a concentration of 30 mg dL⁻¹. If 90 % of the filtered urea is re‑absorbed and the kidneys excrete 1.5 L of urine per day, what is the average concentration of urea in the urine (in mg dL⁻¹)?
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This is Waec Model Questions Vol1 2025 Biology Question 31. It is one of the objective questions from the 2025 Waec Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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