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7.3 Homeostasis and thermoregulation

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Question 1
F

A student used two flasks to model the effect of sweating on heat loss.

  • Each flask was filled with 200 cm3 of water at 60 ∘C60\ ^{\circ}\text{C}60 ∘C.
  • Flask A was wrapped in a dry cotton cloth.
  • Flask B was wrapped in a cotton cloth soaked in water.
  • The student recorded the temperature of the water in each flask every 5 minutes.

The Table shows the results.

Table

Time in minutesTemperature of water in flask A in ∘C^{\circ}\text{C}∘CTemperature of water in flask B in ∘C^{\circ}\text{C}∘C
06060
55652
105346
155041
204837
a.

Calculate the mean rate of temperature decrease of the water in flask B over the 20 minutes.

Give the unit.

[2]
b.

Explain why the water in flask B cooled faster than the water in flask A.

[2]
c.

Give one variable, other than the starting temperature of the water, that the student kept the same.

[1]
d.

Suggest one reason why flask B is not a good model of a sweating person.

[1]
Markscheme

7.3 Homeostasis and thermoregulation Questions

  1. GCSE
  2. /Biology
  3. /7.3 Homeostasis and thermoregulation

44 exam-style questions on Edexcel GCSE Biology 7.3 Homeostasis and thermoregulation, covering 7.3.1 Importance of a constant internal environment, 7.3.2 Importance of homeostasis, 7.3.3a Thermoregulation via the skin and hypothalamus, and 7.3.3b Vasoconstriction and vasodilation in thermoregulation. Each one has a worked solution and a mark scheme showing where the marks go.

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