Igcse Model Questions Vol1 2022 Biology Question 22

Practice objective / multiple choice question 22 from the 2022 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2022 Biology Objective / Multiple Choice Hard Difficulty
Question 22 IGCSE_MODEL_QUESTIONS_VOL1 • 2022 • BIOLOGY • objective

A desert mammal dissipates heat through its large ears. The ear surface area is \(150\) cm\(^2\) and the temperature difference between the blood in the ears and the ambient air is \(20^{\circ}C\). The heat transfer coefficient is \(15\) W·m\(^{-2}\)·K\(^{-1}\).\n\nAnother desert animal loses water through respiration at a rate of \(0.1\) g·min\(^{-1}\). The latent heat of vaporisation of water is \(2400\) J·g\(^{-1}\).\n\nCalculate the rate of heat loss (in J·s\(^{-1}\)) from the ears and from respiration, and state which adaptation dissipates more heat.

Answer Options

A. Ear heat loss = 3.0 J·s⁻¹; respiration heat loss = 4 J·s⁻¹; respiration dissipates more heat.
B. Ear heat loss = 4.5 J·s⁻¹; respiration heat loss = 5 J·s⁻¹; respiration dissipates more heat.
Correct Answer C. Ear heat loss = 4.5 J·s⁻¹; respiration heat loss = 4 J·s⁻¹; ears dissipate more heat.
D. Ear heat loss = 6.0 J·s⁻¹; respiration heat loss = 4 J·s⁻¹; ears dissipate more heat.
Correct Answer
C
Correct Option:
Ear heat loss = 4.5 J·s⁻¹; respiration heat loss = 4 J·s⁻¹; ears dissipate more heat.

About This Question

This is Igcse Model Questions Vol1 2022 Biology Question 22. It is one of the objective questions from the 2022 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Hard .

View More Igcse Model Questions Vol1 2022 Biology Questions More Igcse Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support