Lesson 3.4.7.1

3.4.7.1 Investigating diversity and sampling Quiz: AQA Biology, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.4.7.1, Investigating diversity and sampling: 20 multiple choice questions for the AQA Biology (7402), Unit 4: Genetic information, variation and relationships, written with Revision Ninja.

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The 20 questions

  1. Which observable feature can be used to compare genetic diversity within a species?

    • Ecological niche
    • Population size
    • Geographical range
    • Measurable characteristics

  2. What macromolecular sequence is directly compared to measure genetic diversity between organisms?

    • Phospholipid sequence
    • Fatty acid sequence
    • Monosaccharide sequence
    • Amino acid sequence

  3. What is the main purpose of using random sampling in field investigations?

    • To avoid bias
    • To maximise yield
    • To increase accuracy
    • To reduce anomaly

  4. What statistic best represents the central value of a quantitative biological sample?

    • Range
    • Variance
    • Standard deviation
    • Mean

  5. What statistic measures the spread of data around the mean value?

    • Median
    • Percentage error
    • Standard deviation
    • Mode

  6. What are A-level students expected to do with standard deviation in written exams?

    • Prove the theorem
    • Interpret results
    • Calculate by hand
    • Derive the formula

  7. Which tool can be used to generate unbiased coordinates for field sampling?

    • Quadrat frame
    • Transect line
    • Measuring tape
    • Random number generator

  8. Modern gene technology allows genetic diversity to be measured by directly comparing what?

    • DNA base sequences
    • Population densities
    • Phenotypic traits
    • Fossil records

  9. How has gene technology improved the study of genetic diversity compared to observing phenotypes?

    • Lower cost equipment
    • Direct DNA sequencing
    • Larger sample sizes
    • Faster field collection

  10. What does a high percentage of matching DNA base sequences between two species indicate?

    • Convergent evolution only
    • Close evolutionary relationship
    • High reproductive rate
    • Identical ecological niches

  11. Compared to distant relatives, closely related species have amino acid sequences with what?

    • More differences
    • Fewer differences
    • Higher mutation rates
    • Identical codon lengths

  12. What statistic is paired with the mean to describe variation in quantitative sample data?

    • Standard deviation
    • Percentage error
    • Species richness
    • Index of diversity

  13. What technique ensures that every leaf on a plant has an equal chance of selection?

    • Stratified sampling
    • Systematic sampling
    • Random sampling
    • Selective sampling

  14. What does a larger standard deviation indicate about data with the same mean?

    • Smaller range
    • Higher mean
    • Greater spread
    • Greater accuracy

  15. What provides the most direct molecular evidence for genetic differences between two species?

    • Geographical distribution
    • Anatomical features
    • Observable phenotypes
    • DNA base sequences

  16. Why are DNA sequences preferred over observable characteristics when measuring genetic diversity?

    • Show greater variation
    • Always larger samples
    • Easier to observe
    • Unaffected by environment

  17. What statistic is reported with the mean to show the spread of data?

    • Mode
    • Median
    • Standard error
    • Standard deviation

  18. How can quadrat positions be selected to ensure random sampling in a field?

    • Regular grid intervals
    • Visual estimation
    • Random number coordinates
    • Transect line sampling

  19. What can be determined by comparing DNA base sequences from two different species?

    • Evolutionary relationships
    • Population size
    • Ecological niche
    • Trophic level

  20. Which statistic quantifies the variation of a measured characteristic around a sample mean?

    • Index of diversity
    • Correlation coefficient
    • Chi-squared value
    • Standard deviation

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