Lesson 4.2.1a

4.2.1a Measuring biodiversity and sampling Quiz: OCR Biology, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 4.2.1a, Measuring biodiversity and sampling: 20 multiple choice questions for the OCR Biology (H020), Unit 4: Biodiversity, written with Revision Ninja.

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The 20 questions

  1. Which term describes the total number of different species in a habitat?

    • Genetic diversity
    • Habitat diversity
    • Species richness
    • Species evenness

  2. Which term describes the relative abundance of individuals of each species in a habitat?

    • Species evenness
    • Genetic diversity
    • Species richness
    • Biodiversity index

  3. Which term describes the variety of alleles present within a species?

    • Species evenness
    • Genetic biodiversity
    • Habitat diversity
    • Species richness

  4. Which sampling technique is used to collect small ground-dwelling invertebrates?

    • Tullgren funnel
    • Pooter
    • Sweep net
    • Pitfall trap

  5. What equipment is used to safely collect small invertebrates by suction?

    • Kick net
    • Sweep net
    • Pooter
    • Pitfall trap

  6. Which equipment is used to collect small invertebrates from tall vegetation?

    • Sweep net
    • Tullgren funnel
    • Pooter
    • Pitfall trap

  7. How are sample positions selected in random sampling to avoid bias?

    • Using random numbers
    • At fixed intervals
    • By human choice
    • Along a transect

  8. How are samples taken when using a systematic sampling method?

    • At fixed intervals
    • By opportunistic choice
    • Based on abundance
    • Using random coordinates

  9. A sample contains 10 individuals of species A, 5 of species B and 5 of species C (N = 20). What is Simpson's Index of Diversity, D, to two decimal places?

    • 0.50
    • 0.92
    • 0.66
    • 0.34

  10. What does a Simpson's Index of Diversity value near zero indicate?

    • High biodiversity
    • Maximum genetic diversity
    • Low biodiversity
    • High species evenness

  11. Habitat X has D = 0.85 and habitat Y has D = 0.30. Which habitat has higher biodiversity?

    • Habitat X
    • Neither habitat
    • Both are equal
    • Habitat Y

  12. Quadrat counts of dandelions in 10 quadrats are 4, 6, 5, 3, 7, 5, 4, 6, 5 and 5. What is the mean number per quadrat?

    • 4.5 per quadrat
    • 50 per quadrat
    • 5 per quadrat
    • 5.5 per quadrat

  13. A species is found in 8 of 20 quadrats. What is its percentage frequency?

    • 8%
    • 40%
    • 20%
    • 80%

  14. Which sampling method ensures all sub-areas of a varied habitat are represented?

    • Stratified sampling
    • Random sampling
    • Opportunistic sampling
    • Systematic sampling

  15. A zoo population has 40 gene loci, of which 10 are polymorphic. What is the proportion of polymorphic gene loci?

    • 0.10, or 10%
    • 4.0, or 400%
    • 0.40, or 40%
    • 0.25, or 25%

  16. What is the main benefit of increasing the number of quadrats sampled?

    • Removes all bias
    • Ensures maximum density
    • Increases species mutation
    • Reduces chance variation

  17. Two habitats have equal species richness but different Simpson's Index values. What factor differs?

    • Habitat size
    • Genetic mutation
    • Species evenness
    • Sample bias

  18. What type of error occurs when a sampling method consistently misses certain species?

    • Genetic drift
    • Sampling bias
    • Random error
    • Human calculation error

  19. Species A has 20 individuals, species B has 10 and species C has 10 (N = 40). What is Simpson's Index of Diversity, D, to two decimal places?

    • 0.36
    • 0.82
    • 0.50
    • 0.64

  20. Which calculation is used to quantify the genetic biodiversity of a population?

    • Lincoln index estimate
    • Simpson's index value
    • Polymorphic gene loci
    • Species richness count

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