Neco 2021 Biology Question 29

Practice objective / multiple choice question 29 from the 2021 Neco Biology examination.

Neco 2021 Biology Objective / Multiple Choice Medium Difficulty
Question 29 NECO • 2021 • BIOLOGY • objective

In a physiological study, when ambient temperature rises from 25 °C to 35 °C, the average skin blood flow increases from 300 ml min^{-1} to 800 ml min^{-1}. Sweating rate is reported to increase linearly at 0.5 ml min^{-1} per °C above a threshold temperature, and at 35 °C the measured sweating rate is 7.5 ml min^{-1}. (a) Determine the threshold ambient temperature at which sweating begins. (b) Calculate the heat loss (in kcal min^{-1}) due to sweating when ambient temperature is 38 °C, given the latent heat of vapourisation of water is 580 kcal kg^{-1} and the density of sweat is 1 g ml^{-1}.

Answer Options

A. Threshold temperature = 25 °C; heat loss ≈ 6.0 kcal min^{-1}
Correct Answer B. Threshold temperature = 20 °C; heat loss ≈ 5.2 kcal min^{-1}
C. Threshold temperature = 18 °C; heat loss ≈ 5.8 kcal min^{-1}
D. Threshold temperature = 22 °C; heat loss ≈ 4.6 kcal min^{-1}
Correct Answer
B
Correct Option:
Threshold temperature = 20 °C; heat loss ≈ 5.2 kcal min^{-1}

About This Question

This is Neco 2021 Biology Question 29. It is one of the objective questions from the 2021 Neco Biology examination.

Difficulty level: Medium .

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