Waec Model Questions Vol1 2021 Biology Question 50

Practice objective / multiple choice question 50 from the 2021 Waec Model Questions Vol1 Biology examination.

Waec Model Questions Vol1 2021 Biology Objective / Multiple Choice Medium Difficulty
Question 50 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • BIOLOGY • objective

At rest, a subject consumes 250 mL of O₂ per minute and produces 200 mL of CO₂ per minute. (a) Calculate the respiratory quotient (RQ). (b) Identify the predominant metabolic substrate being oxidized. (c) Estimate the energy expenditure per minute, given that oxidation of 1 L of O₂ yields approximately 5 kcal.

Answer Options

Correct Answer A. RQ = 0.80; predominant substrate = fat; energy expenditure ≈ 1.25 kcal per minute
B. RQ = 0.70; predominant substrate = protein; energy expenditure ≈ 1.00 kcal per minute
C. RQ = 0.90; predominant substrate = carbohydrate; energy expenditure ≈ 1.50 kcal per minute
D. RQ = 1.00; predominant substrate = carbohydrate; energy expenditure ≈ 2.00 kcal per minute
Correct Answer
A
Correct Option:
RQ = 0.80; predominant substrate = fat; energy expenditure ≈ 1.25 kcal per minute

About This Question

This is Waec Model Questions Vol1 2021 Biology Question 50. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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