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Variation: CAIE A‑Level Biology questions

Every CAIE A-Level Biology exam question on 17.1 Variation, June 2024 and the specimen papers, with its mark scheme and examiner’s report.

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240 questions

  1. Q9(a)

    June 2024 · Paper 4

    2 marks17.1 Variation
    The whole paper ↗
    June 2024 Paper 4, question 9(a): Within a species, the variation that is observed for a particular characteristic can be described as discontinuous or continuous. Discontinuous variation has a

  2. Q9(b)

    June 2024 · Paper 4

    2 marks17.1 Variation
    The whole paper ↗
    June 2024 Paper 4, question 9(b): Fig. 9.1 shows three of the colour patterns seen in H. axyridis and the percentage of each in a population. colour pattern conspicua spectabilis succinea percen

  3. Q9(c)

    June 2024 · Paper 4

    2 marks17.1 Variation
    The whole paper ↗
    June 2024 Paper 4, question 9(c): The body size of adult H. axyridis varies from 5 mm to 8 mm. Adult ladybirds do not grow or change size. Adults develop from larvae that hatch from eggs. State

  4. Q2(d)(i)

    June 2024 · Paper 5

    1 mark17.1 Variation
    The whole paper ↗
    June 2024 Paper 5, question 2(d)(i): The biologist noticed that the young trees in group 4 had some dead leaves at the end of week 5. The biologist determined the percentage of leaves on the young

  5. Q2(d)(ii)

    June 2024 · Paper 5

    2 marks17.1 Variation
    The whole paper ↗
    June 2024 Paper 5, question 2(d)(ii): The formula for the t-test is: key to symbols: x x r - r 1 2 t = xr = mean e s 2 s 2 o 1 2 s = sample standard deviation + n n 1 2 n = sample size (number of ob

  6. Q2(d)(iii)

    June 2024 · Paper 5

    3 marks17.1 Variation
    The whole paper ↗
    June 2024 Paper 5, question 2(d)(iii): The degrees of freedom for this t-test are 48. Table 2.4 shows the probability table for the t-test. Table 2.4 degrees of freedom critical values p = 0.10 (10%)

  7. Q2(d)(i)

    Specimen · Paper 5

    2 marks17.1 Variation
    The whole paper ↗
    Specimen Paper 5, question 2(d)(i): The student carried out a third investigation to find out if the difference in the number of hybrid grains germinating from the two crosses was significant. The

  8. Q2(d)(ii)

    Specimen · Paper 5

    1 mark17.1 Variation
    The whole paper ↗
    Specimen Paper 5, question 2(d)(ii): The student used the t-test to compare the means. State one feature of the data that allows use of the t-test. [1]

  9. Q2(d)(iii)

    Specimen · Paper 5

    1 mark17.1 Variation
    The whole paper ↗
    Specimen Paper 5, question 2(d)(iii): State a null hypothesis for this t-test. [1]

  10. Q2(d)(iv)

    Specimen · Paper 5

    1 mark17.1 Variation
    The whole paper ↗
    Specimen Paper 5, question 2(d)(iv): State why the number of degrees of freedom for this t-test is 20. [1] [Total: 12]
All 10 questions on Variation, as a list
  1. June 2024, Paper 4, Q9(a) (2 marks): Within a species, the variation that is observed for a particular characteristic can be described as discontinuous or continuous. Discontinuous variation has a
  2. June 2024, Paper 4, Q9(b) (2 marks): Fig. 9.1 shows three of the colour patterns seen in H. axyridis and the percentage of each in a population. colour pattern conspicua spectabilis succinea percen
  3. June 2024, Paper 4, Q9(c) (2 marks): The body size of adult H. axyridis varies from 5 mm to 8 mm. Adult ladybirds do not grow or change size. Adults develop from larvae that hatch from eggs. State
  4. June 2024, Paper 5, Q2(d)(i) (1 mark): The biologist noticed that the young trees in group 4 had some dead leaves at the end of week 5. The biologist determined the percentage of leaves on the young
  5. June 2024, Paper 5, Q2(d)(ii) (2 marks): The formula for the t-test is: key to symbols: x x r - r 1 2 t = xr = mean e s 2 s 2 o 1 2 s = sample standard deviation + n n 1 2 n = sample size (number of ob
  6. June 2024, Paper 5, Q2(d)(iii) (3 marks): The degrees of freedom for this t-test are 48. Table 2.4 shows the probability table for the t-test. Table 2.4 degrees of freedom critical values p = 0.10 (10%)
  7. Specimen, Paper 5, Q2(d)(i) (2 marks): The student carried out a third investigation to find out if the difference in the number of hybrid grains germinating from the two crosses was significant. The
  8. Specimen, Paper 5, Q2(d)(ii) (1 mark): The student used the t-test to compare the means. State one feature of the data that allows use of the t-test. [1]
  9. Specimen, Paper 5, Q2(d)(iii) (1 mark): State a null hypothesis for this t-test. [1]
  10. Specimen, Paper 5, Q2(d)(iv) (1 mark): State why the number of degrees of freedom for this t-test is 20. [1] [Total: 12]

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