Igcse Model Questions Vol1 2022 Biology Question 28

Practice objective / multiple choice question 28 from the 2022 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2022 Biology Objective / Multiple Choice Medium Difficulty
Question 28 IGCSE_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • objective
Igcse Model Questions Vol1 2022 Biology Question 28 diagram

The diagram shows the partial pressures of oxygen (O₂) and carbon dioxide (CO₂) in alveolar air and in pulmonary arterial blood. In alveolar air the O₂ partial pressure is \(100\) mmHg and the CO₂ partial pressure is \(40\) mmHg. In the pulmonary arterial blood the O₂ partial pressure is \(40\) mmHg and the CO₂ partial pressure is \(45\) mmHg. Calculate the diffusion gradient (difference in partial pressure) for O₂ and for CO₂ between alveolar air and blood, and state which gas diffuses down the greater gradient.

Answer Options

A. O₂ gradient = 60 mmHg, CO₂ gradient = 10 mmHg; CO₂ diffuses down the greater gradient.
B. O₂ gradient = 55 mmHg, CO₂ gradient = 5 mmHg; O₂ diffuses down the greater gradient.
C. O₂ gradient = 50 mmHg, CO₂ gradient = 5 mmHg; O₂ diffuses down the greater gradient.
Correct Answer D. O₂ gradient = 60 mmHg, CO₂ gradient = 5 mmHg; O₂ diffuses down the greater gradient.
Correct Answer
D
Correct Option:
O₂ gradient = 60 mmHg, CO₂ gradient = 5 mmHg; O₂ diffuses down the greater gradient.

About This Question

This is Igcse Model Questions Vol1 2022 Biology Question 28. It is one of the objective questions from the 2022 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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