A student investigates evaporative cooling using two identical flasks of warm water. Each flask is covered with the same mass of cotton fabric. One piece of fabric is wet and the other is dry.
Which additional condition must be the same to compare cooling fairly?
the volume and starting temperature of the water in each flask
the final temperature and temperature decrease of water in each flask
the amount of water evaporated from each piece of fabric
the water content and drying time of each piece of fabric
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.