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Homeostasis in mammals: CAIE A‑Level Biology questions

Every CAIE A-Level Biology exam question on 14.1 Homeostasis in mammals, June 2024 and the specimen papers, with its mark scheme and examiner’s report.

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240 questions

  1. Q5(b)(i)

    Specimen · Paper 4

    1 mark14.1 Homeostasis in mammals
    The whole paper ↗
    Specimen Paper 4, question 5(b)(i): Ultrafiltration requires a high blood pressure in the glomerulus. Explain how this high blood pressure is achieved. [1]

  2. Q5(b)(ii)

    Specimen · Paper 4

    1 mark14.1 Homeostasis in mammals
    The whole paper ↗
    Specimen Paper 4, question 5(b)(ii): Name the main filtration barrier in the nephron that allows creatinine to pass into the Bowman’s capsule but stops red blood cells from passing through. [1]

  3. Q5(c)(i)

    Specimen · Paper 4

    2 marks14.1 Homeostasis in mammals
    The whole paper ↗
    Specimen Paper 4, question 5(c)(i): Describe the relationship shown in Fig. 5.2. [2]

  4. Q5(c)(ii)

    Specimen · Paper 4

    2 marks14.1 Homeostasis in mammals
    The whole paper ↗
    Specimen Paper 4, question 5(c)(ii): Use Fig. 5.2 to estimate the concentration of creatinine in the blood that indicates a normal GFR. concentration = [2]

  5. Q5(c)(iii)

    Specimen · Paper 4

    2 marks14.1 Homeostasis in mammals
    The whole paper ↗
    Specimen Paper 4, question 5(c)(iii): Suggest two reasons why the GFR of a person might decrease. [2] [Total: 12]
All 5 questions on Homeostasis in mammals, as a list
  1. Specimen, Paper 4, Q5(b)(i) (1 mark): Ultrafiltration requires a high blood pressure in the glomerulus. Explain how this high blood pressure is achieved. [1]
  2. Specimen, Paper 4, Q5(b)(ii) (1 mark): Name the main filtration barrier in the nephron that allows creatinine to pass into the Bowman’s capsule but stops red blood cells from passing through. [1]
  3. Specimen, Paper 4, Q5(c)(i) (2 marks): Describe the relationship shown in Fig. 5.2. [2]
  4. Specimen, Paper 4, Q5(c)(ii) (2 marks): Use Fig. 5.2 to estimate the concentration of creatinine in the blood that indicates a normal GFR. concentration = [2]
  5. Specimen, Paper 4, Q5(c)(iii) (2 marks): Suggest two reasons why the GFR of a person might decrease. [2] [Total: 12]

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