plumiControlling the water potential of the blood: OCR A‑Level Biology A questions
OCR A-Level Biology A past-paper questions on 5.1.2.3 Controlling the water potential of the blood, 2016–2025, with mark schemes and examiner’s reports where available.
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Q18(a)(ii)
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All 9 questions on Controlling the water potential of the blood, as a list
- June 2024, Paper 1, Q18(a)(ii) (2 marks): Furosemide can also be misused by jockeys or boxers who need to be below a certain weight. Explain how a diuretic could help to reduce weight. [2]
- June 2024, Paper 1, Q18(d) (6 marks): (d)* Describe the homeostatic mechanisms that regulate the water content of the blood by changing how much water is reabsorbed from the collecting duct. You do
- June 2023, Paper 1, Q19(c)(i) (3 marks): Complete the table using the most appropriate letter or letters, W to Z, to show which part(s) of the nephron correspond to each of the statements. Each letter
- November 2020, Paper 3, Q1(c) (6 marks): (c)* Water reabsorption in the kidney is controlled by the endocrine and nervous systems. Aldosterone and ADH are hormones that act on the kidney. Aldosterone c
- November 2020, Paper 3, Q1(d)(i) (1 mark): Suggest which of the diuretics, X, Y or Z, would be the most effective at reducing a person’s blood pressure. Explain your choice. diuretic explanation [1]
- November 2020, Paper 3, Q1(d)(ii) (1 mark): Suggest which of the diuretics, X, Y or Z, would be the most appropriate for use by a person with type II diabetes. Explain your choice. diuretic explanation [1
- June 2019, Paper 1, Q12 (1 mark): Damage to the hypothalamus results in lower water potential of the blood. Which of the following, A to D, explains these observations? A ADH release increases t
- June 2019, Paper 1, Q15 (1 mark): The hormone aldosterone is produced by the adrenal cortex. Excess production of aldosterone can result in high blood pressure. The following statements describe
- June 2017, Paper 1, Q22(b)(ii) (2 marks): Nephrogenic diabetes insipidus is a disease of the kidney that affects the regulation of water potential in the blood. One cause is lithium poisoning. Lithium i
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