Waec Model Questions Vol1 2021 Biology Question 20
Practice objective / multiple choice question 20 from the 2021 Waec Model Questions Vol1 Biology examination.
According to Fick's law, the rate of diffusion (J) of a gas across a membrane is given by J = (D × A × ΔP) / T, where D is the diffusion coefficient, A the surface area, ΔP the partial‑pressure difference and T the membrane thickness. Initially, the alveolar membrane has A = 70 cm², T = 0.20 cm, ΔP = 100 mmHg and D = 0.003 cm²·mmHg·s⁻¹. During vigorous exercise the alveolar surface area increases by 20 % and the membrane thickness decreases by 10 %. What is the percentage increase in the diffusion rate of oxygen under these new conditions? Give your answer to one decimal place.
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This is Waec Model Questions Vol1 2021 Biology Question 20. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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