Lesson 3.4.6.1

3.4.6.1 Biodiversity and the index of diversity Quiz: AQA Biology, Unit 4

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.4.6.1, Biodiversity and the index of diversity: 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. What measure describes the number of different species present in a community?

    • Species richness
    • Genetic diversity
    • Index of diversity
    • Species evenness

  2. What relationship does an index of diversity measure in a community?

    • Genotypes to phenotypes
    • Biomass to energy
    • Species to individuals
    • Births to deaths

  3. In the index of diversity formula, what does capital N represent?

    • Total organisms present
    • Organisms per species
    • Number of species
    • Number of habitats

  4. In the index of diversity formula, what does lower-case n represent?

    • Total all organisms
    • Total species count
    • Organisms per species
    • Number of quadrats

  5. A community has 10 individuals, all of one species. What is its index of diversity?

    • 90
    • 10
    • 1
    • 0

  6. Which agricultural practice directly reduces species diversity in a field habitat?

    • Crop rotation
    • Monoculture farming
    • Organic fertilisation
    • Biological pest control

  7. Across which range of spatial scales can biodiversity be measured in habitats?

    • Local to global
    • Genetic to cellular
    • Microscopic to macroscopic
    • Cellular to organismal

  8. A community has 30 individuals in 3 species of 10 each. Calculate the index of diversity to two decimal places.

    • 9.00
    • 3.00
    • 0.33
    • 3.22

  9. Which community structure produces a higher index of diversity for a fixed species count?

    • Uneven species distribution
    • Cluttered distribution
    • Even species distribution
    • Dominant single species

  10. A community has 8 individuals: 4 of species P and 4 of species Q. What is the index of diversity?

    • 4.00
    • 2.00
    • 2.33
    • 8.00

  11. A community has 10 of species A, 5 of species B and 5 of species C. What is the total number of organisms N?

    • 10
    • 20
    • 15
    • 130

  12. Why might quadrat sampling underestimate the total species richness of a habitat?

    • Increases sample size
    • Overcounts common species
    • Counts dead organisms
    • Misses rare species

  13. What happens to the index of diversity when a meadow is converted to wheat monoculture?

    • It increases
    • It reaches infinity
    • It stays constant
    • It decreases

  14. Which sample of 20 total organisms yields the highest index of diversity?

    • 4 species of 5
    • 1 species of 20
    • 2 species of 10
    • 10 species of 2

  15. Modern land management requires balancing nature conservation with which economic demand?

    • Mineral extraction
    • Urban expansion
    • Food production
    • Timber production

  16. What does an index of diversity value of 1 indicate about a community?

    • Single species present
    • Maximum diversity
    • Equal species proportions
    • High species richness

  17. What key factor does an index of diversity account for that species richness ignores?

    • Genetic mutation rate
    • Relative species abundance
    • Organism lifespan
    • Total habitat area

  18. What measure describes the number of different species in a community?

    • Index of diversity
    • Species richness
    • Species evenness
    • Relative abundance

  19. A community has 6 individuals of species A and 2 of species B. What is the index of diversity to two decimal places?

    • 0.75
    • 1.75
    • 3.50
    • 2.33

  20. What variable does 'N' represent in the index of diversity equation?

    • Individual species count
    • Mean sample size
    • Total organism count
    • Number of species

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