Neco Model Questions Vol1 2023 Biology Question 12
Practice objective / multiple choice question 12 from the 2023 Neco Model Questions Vol1 Biology examination.
A fish species X lives in water where the dissolved oxygen concentration is \(6\ \text{mg L}^{-1}\). Its gill surface area is \(2.5\ \text{cm}^{2}\) and the diffusion distance across the gill epithelium is \(0.02\ \text{mm}\). Oxygen diffusion follows Fick's law \(J = D \times A \times (C_{\text{out}} - C_{\text{in}}) / d\), where the diffusion coefficient \(D = 2.0 \times 10^{-5}\ \text{cm}^{2}\text{s}^{-1}\). The fish maintains an internal oxygen concentration of \(2\ \text{mg L}^{-1}\). (a) Calculate the rate of oxygen uptake \(J\) in \(\text{mg s}^{-1}\). (b) If the fish's metabolic demand is \(0.15\ \text{mg s}^{-1}\), state whether the gill supply is sufficient.
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This is Neco Model Questions Vol1 2023 Biology Question 12. It is one of the objective questions from the 2023 Neco Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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