Waec Model Questions Vol1 2025 Biology Question 25

Practice objective / multiple choice question 25 from the 2025 Waec Model Questions Vol1 Biology examination.

Waec Model Questions Vol1 2025 Biology Objective / Multiple Choice Hard Difficulty
Question 25 WAEC_MODEL_QUESTIONS_VOL1 • 2025 • BIOLOGY • objective

Mountain goat Species A lives at 3000 m altitude and has a hemoglobin P₅₀ of 26 mmHg. Species B lives at 4500 m and has a P₅₀ of 20 mmHg. Both have the same hemoglobin concentration and a Hill coefficient n = 2.5. Using the Hill equation SaO₂ = PO₂ⁿ / (P₅₀ⁿ + PO₂ⁿ), calculate the arterial oxygen saturation (SaO₂) for each species when arterial PO₂ is 60 mmHg. Then, assuming tissue PO₂ is 30 mmHg and cardiac output is identical, determine which species delivers more oxygen to its tissues.

Answer Options

Correct Answer A. SaO₂ ≈ 89 % for Species A and ≈ 94 % for Species B; Species B delivers more oxygen
B. SaO₂ ≈ 89 % for Species A and ≈ 94 % for Species B; Species A delivers more oxygen
C. SaO₂ ≈ 85 % for Species A and ≈ 90 % for Species B; Species A delivers more oxygen
D. SaO₂ ≈ 92 % for Species A and ≈ 88 % for Species B; Species B delivers more oxygen
Correct Answer
A
Correct Option:
SaO₂ ≈ 89 % for Species A and ≈ 94 % for Species B; Species B delivers more oxygen

About This Question

This is Waec Model Questions Vol1 2025 Biology Question 25. It is one of the objective questions from the 2025 Waec Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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