Igcse Model Questions Vol1 2018 Biology Question 33

Practice objective / multiple choice question 33 from the 2018 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2018 Biology Objective / Multiple Choice Medium Difficulty
Question 33 IGCSE_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • objective

During a steady‑state exercise a person produces 0.25 L of CO\(_2\) per minute and consumes 0.20 L of O\(_2\) per minute.\n\n(a) Determine the respiratory quotient (RQ).\n\n(b) Based on typical RQ values, identify the predominant metabolic substrate being used.

Answer Options

Correct Answer A. RQ = 1.25; predominant substrate = carbohydrate (with anaerobic contribution).
B. RQ = 0.90; predominant substrate = mixed (carbohydrate and fat)
C. RQ = 1.00; predominant substrate = protein
D. RQ = 0.80; predominant substrate = fat
Correct Answer
A
Correct Option:
RQ = 1.25; predominant substrate = carbohydrate (with anaerobic contribution).

About This Question

This is Igcse Model Questions Vol1 2018 Biology Question 33. It is one of the objective questions from the 2018 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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