Waec Model Questions Vol1 2019 Biology Question 6
Practice objective / multiple choice question 6 from the 2019 Waec Model Questions Vol1 Biology examination.
A freshwater fish maintains an internal Na⁺ concentration of 150 mM. In freshwater the ambient Na⁺ concentration is 0.5 mM. Na⁺ diffuses across the gill surface (area = 2 cm²) with a permeability coefficient of 1×10⁻⁵ cm·s⁻¹. (a) Calculate the rate of Na⁺ loss (in mmol·s⁻¹) by diffusion. (b) The fish can actively pump Na⁺ at a rate of 2×10⁻⁶ mol·cm⁻²·s⁻¹ across the same gill area. Can the active transport fully compensate for the diffusive loss? Answer "Yes" or "No".
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About This Question
This is Waec Model Questions Vol1 2019 Biology Question 6. It is a objective / multiple choice question from the 2019 Waec Model Questions Vol1 Biology examination.
Difficulty level: Hard .
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