Igcse Model Questions Vol1 2023 Biology Question 40

Practice objective / multiple choice question 40 from the 2023 Igcse Model Questions Vol1 Biology examination.

Igcse Model Questions Vol1 2023 Biology Objective / Multiple Choice Hard Difficulty
Question 40 IGCSE_MODEL_QUESTIONS_VOL1 • 2023 • BIOLOGY • objective

A desert rodent (mass 0.5 kg) loses water through respiration at a rate of 0.8 ml min\(^{-1}\) kg\(^{-1}\) and through skin at 0.2 ml min\(^{-1}\) kg\(^{-1}\). An arctic mammal of the same mass loses water through respiration at 0.5 ml min\(^{-1}\) kg\(^{-1}\) and through skin at 0.4 ml min\(^{-1}\) kg\(^{-1}\). Their total body water reserves are 30 ml for the rodent and 40 ml for the arctic mammal. (a) Calculate the time (in minutes) each animal can survive before dehydration. (b) Which adaptation provides a longer survival time and why?

Answer Options

A. Desert rodent: 48 min; Arctic mammal: ≈71 min; the arctic mammal's adaptation gives a longer survival time due to lower total water‑loss rate and larger reserve.
Correct Answer B. Desert rodent: 60 min; Arctic mammal: ≈89 min; the arctic mammal's adaptation gives a longer survival time due to lower total water‑loss rate and larger reserve.
C. Desert rodent: 75 min; Arctic mammal: ≈89 min; the desert rodent's adaptation gives a longer survival time because it loses water more slowly through skin.
D. Desert rodent: 60 min; Arctic mammal: ≈100 min; the arctic mammal's adaptation gives a longer survival time due to lower total water‑loss rate and larger reserve.
Correct Answer
B
Correct Option:
Desert rodent: 60 min; Arctic mammal: ≈89 min; the arctic mammal's adaptation gives a longer survival time due to lower total water‑loss rate and larger reserve.

About This Question

This is Igcse Model Questions Vol1 2023 Biology Question 40. It is one of the objective questions from the 2023 Igcse Model Questions Vol1 Biology examination.

Difficulty level: Hard .

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