A student measures the volume of urine they produce on two different days.
The student drinks the same volume of water on both days.
Table
| Day | Air temperature in ∘C^\circ\text{C}∘C | Volume of urine produced in cm3\text{cm}^3cm3 |
|---|---|---|
| 1 | 14 | 1500 |
| 2 | 31 | 900 |
Which statement explains the difference in the volume of urine produced?
More urea was made on day 2, so the kidneys needed less water to excrete the urea.
More water was lost in sweat on day 2, so the kidneys excreted less water in urine.
More water was lost in sweat on day 2, so the kidneys filtered more of the blood.
Less water was lost in sweat on day 2, so the kidneys excreted less water in urine.
72 exam-style questions on OCR GCSE Biology 3.3 Maintaining internal environments, covering 3.3.1 Importance of a constant internal environment, 3.3.2 The skin and body temperature, 3.3.3 Insulin and blood sugar, 3.3.4 Glucagon and blood sugar, 3.3.5 Type 1 and type 2 diabetes, 3.3.6 Osmotic changes in body fluids, 3.3.7 Kidneys and water balance, 3.3.8 Structure of the kidney and tubule, 3.3.9 ADH and kidney tubule permeability, and 3.3.10 Responses to temperature and osmotic challenges. Each one has a worked solution and a mark scheme showing where the marks go.