Igcse Model Questions Vol1 2025 Biology Question 12

Practice objective / multiple choice question 12 from the 2025 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2025 Biology Objective / Multiple Choice Medium Difficulty
Question 12 IGCSE_MODEL_QUESTIONS_VOL1 • 2025 • BIOLOGY • objective

A person has a glomerular filtration rate (GFR) of \(120\ \text{mL min}^{-1}\). The plasma glucose concentration is \(7\ \text{mmol L}^{-1}\). The renal tubules normally reabsorb 99\% of the filtered glucose. (a) If the urine flow rate is \(1.5\ \text{mL min}^{-1}\), calculate the concentration of glucose in the urine (mmol L\(^{-1}\)). (b) A drug reduces the reabsorption efficiency to 95\%. Assuming the urine flow rate remains unchanged, what is the new urine glucose concentration? Give answers to one decimal place.

Answer Options

A. a) 5.0 mmol L⁻¹; b) 25.0 mmol L⁻¹
B. a) 6.3 mmol L⁻¹; b) 30.0 mmol L⁻¹
C. a) 4.2 mmol L⁻¹; b) 22.0 mmol L⁻¹
Correct Answer D. a) 5.6 mmol L⁻¹; b) 28.0 mmol L⁻¹
Correct Answer
D
Correct Option:
a) 5.6 mmol L⁻¹; b) 28.0 mmol L⁻¹

About This Question

This is Igcse Model Questions Vol1 2025 Biology Question 12. It is one of the objective questions from the 2025 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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