Neco 2023 Biology Question 44

Practice objective / multiple choice question 44 from the 2023 Neco Biology examination.

Neco 2023 Biology Objective / Multiple Choice Medium Difficulty
Question 44 NECO • 2023 • BIOLOGY • objective

Two fish species differ in their gill morphology. Species X has a total gill surface area of 2.5 cm² and an average diffusion distance for O₂ of 0.02 cm. Species Y has a surface area of 1.5 cm² and a diffusion distance of 0.01 cm. The diffusion coefficient of O₂ in water is \(D = 2.1 \times 10^{-5}\,\text{cm}^2\text{s}^{-1}\) and the concentration gradient across the gill epithelium is \(\Delta C = 0.15\,\text{mol cm}^{-3}\). Using Fick's law \(\text{Rate}=\dfrac{D\,A\,\Delta C}{d}\), calculate the rate of O₂ diffusion for each species and state which species has the higher rate and by what factor.

Answer Options

A. Species X: 4.73e-4 mol·s⁻¹; Species Y: 3.94e-4 mol·s⁻¹; X is higher by factor ≈1.2
B. Species X: 5.00e-4 mol·s⁻¹; Species Y: 4.00e-4 mol·s⁻¹; X is higher by factor ≈1.25
Correct Answer C. Species X: 3.94e-4 mol·s⁻¹; Species Y: 4.73e-4 mol·s⁻¹; Y is higher by factor ≈1.2
D. Species X: 3.94e-4 mol·s⁻¹; Species Y: 4.73e-4 mol·s⁻¹; Y is higher by factor ≈1.5
Correct Answer
C
Correct Option:
Species X: 3.94e-4 mol·s⁻¹; Species Y: 4.73e-4 mol·s⁻¹; Y is higher by factor ≈1.2

About This Question

This is Neco 2023 Biology Question 44. It is one of the objective questions from the 2023 Neco Biology examination.

Difficulty level: Medium .

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