Igcse Model Questions Vol1 2017 Biology Question 21

Practice objective / multiple choice question 21 from the 2017 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2017 Biology Objective / Multiple Choice Hard Difficulty
Question 21 IGCSE_MODEL_QUESTIONS_VOL1 • 2017 • BIOLOGY • objective

Two rodent species live in different habitats. The desert species has a body approximated by a cylinder 12 cm long and 3 cm in diameter, and each ear is a thin disc of radius 2 cm and thickness 0.2 cm. The rainforest species has a body cylinder 10 cm long and 4 cm in diameter, and each ear is a disc of radius 1 cm and thickness 0.2 cm. Heat loss is proportional to the total ear surface area divided by body volume. Which species loses heat faster?

Answer Options

A. Both species lose heat at the same rate (identical ear‑surface‑area‑to‑body‑volume ratios).
Correct Answer B. The desert rodent loses heat faster (higher ear‑surface‑area‑to‑body‑volume ratio).
C. The rainforest rodent loses heat faster (higher ear‑surface‑area‑to‑body‑volume ratio).
D. The desert rodent loses heat faster (greater body volume relative to ear surface area).
Correct Answer
B
Correct Option:
The desert rodent loses heat faster (higher ear‑surface‑area‑to‑body‑volume ratio).

About This Question

This is Igcse Model Questions Vol1 2017 Biology Question 21. It is one of the objective questions from the 2017 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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