Igcse Model Questions Vol1 2025 Biology Question 40

Practice objective / multiple choice question 40 from the 2025 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2025 Biology Objective / Multiple Choice Medium Difficulty
Question 40 IGCSE_MODEL_QUESTIONS_VOL1 • 2025 • BIOLOGY • objective

The glomerular filtration rate (GFR) in a healthy adult is 125 mL min⁻¹.\n(a) Calculate the total volume of filtrate produced in 24 hours.\n(b) If 99 % of this filtrate is re‑absorbed, how much urine is excreted per day?\n(c) Each nephron filters (1.2\times10^{-6}\,\text{L}\,\text{min}^{-1}\). Estimate the total number of nephrons in the kidneys, rounding to two significant figures.

Answer Options

Correct Answer A. 180 L filtrate; 1.8 L urine; ≈1.0 × 10⁵ nephrons
B. 200 L filtrate; 1.8 L urine; ≈1.2 × 10⁵ nephrons
C. 150 L filtrate; 1.5 L urine; ≈8.0 × 10⁴ nephrons
D. 180 L filtrate; 2.0 L urine; ≈1.0 × 10⁵ nephrons
Correct Answer
A
Correct Option:
180 L filtrate; 1.8 L urine; ≈1.0 × 10⁵ nephrons

About This Question

This is Igcse Model Questions Vol1 2025 Biology Question 40. It is one of the objective questions from the 2025 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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