Igcse Model Questions Vol1 2021 Biology Question 14

Practice objective / multiple choice question 14 from the 2021 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2021 Biology Objective / Multiple Choice Medium Difficulty
Question 14 IGCSE_MODEL_QUESTIONS_VOL1 • 2021 • BIOLOGY • objective

A small mammal has a body surface area of \(0.02\;\text{m}^2\). Its fur reduces heat loss by 60\% compared with naked skin. The thermal conductance of naked skin is \(0.5\;\text{W·m}^{-2}\text{K}^{-1}\). The animal's basal metabolic rate is \(5\;\text{W}\).\n\n(a) Calculate the effective thermal conductance of the furred animal.\n(b) If the ambient temperature falls to \(-10^{\circ}\text{C}\) while the core temperature remains at \(37^{\circ}\text{C}\), determine the rate of heat loss (in watts).\n(c) What is the minimum metabolic rate required to maintain core temperature at this ambient temperature?

Answer Options

A. Effective conductance = 0.25 W·m⁻²K⁻¹; heat loss ≈ 0.24 W; minimum metabolic rate ≈ 0.24 W.
Correct Answer B. Effective conductance = 0.20 W·m⁻²K⁻¹; heat loss ≈ 0.19 W; minimum metabolic rate ≈ 0.19 W.
C. Effective conductance = 0.15 W·m⁻²K⁻¹; heat loss ≈ 0.14 W; minimum metabolic rate ≈ 0.14 W.
D. Effective conductance = 0.30 W·m⁻²K⁻¹; heat loss ≈ 0.28 W; minimum metabolic rate ≈ 0.28 W.
Correct Answer
B
Correct Option:
Effective conductance = 0.20 W·m⁻²K⁻¹; heat loss ≈ 0.19 W; minimum metabolic rate ≈ 0.19 W.

About This Question

This is Igcse Model Questions Vol1 2021 Biology Question 14. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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