Lesson 3.7.4.1

3.7.4.1 Niches, habitats and competition Quiz: AQA Biology, Unit 7

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.7.4.1, Niches, habitats and competition: 20 multiple choice questions for the AQA Biology (7402), Unit 7: Genetics, populations, evolution and ecosystems, written with Revision Ninja.

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The 20 questions

  1. What term describes the role of a species within its habitat?

    • Community
    • Ecosystem
    • Biome
    • Niche

  2. What term describes the place where an organism normally lives?

    • Population
    • Niche
    • Habitat
    • Community

  3. What term describes the maximum stable population size an ecosystem can support?

    • Environmental resistance
    • Carrying capacity
    • Biotic potential
    • Climax community

  4. What type of competition occurs between individuals of the same species?

    • Intraspecific competition
    • Interpopulation competition
    • Interspecific competition
    • Competitive exclusion

  5. What term describes all the populations of different species living in the same area?

    • Population
    • Community
    • Habitat
    • Ecosystem

  6. Which equipment is most appropriate for sampling non-motile or slow-moving organisms?

    • Pooters
    • Quadrats
    • Pitfall traps
    • Sweep nets

  7. Which method is used to estimate the size of a motile population?

    • Random quadrats
    • Mark-release-recapture
    • Belt transects
    • Percentage cover measurements

  8. In a mark-release-recapture study, 50 animals are marked and released. A second sample of 40 contains 10 marked animals. Using the Lincoln index N = (M x n) / m, what is the population estimate?

    • 2000
    • 8
    • 200
    • 125

  9. Which assumption must be met when using the mark-release-recapture method?

    • High mortality rate
    • Random mixing occurs
    • Significant birth rate
    • Emigration is common

  10. What measure estimates the proportion of a quadrat ground area occupied by a species?

    • Frequency
    • Population density
    • Species richness
    • Percentage cover

  11. What is the final, stable stage of ecological succession called?

    • Climax community
    • Biotic community
    • Pioneer community
    • Seral stage

  12. Which of the following is an abiotic factor affecting population size?

    • Disease
    • Predation
    • Temperature
    • Interspecific competition

  13. What type of competition occurs between individuals of different species?

    • Competitive exclusion
    • Intraspecific competition
    • Interspecific competition
    • Intrapopulation competition

  14. A student counts 12 daisies in 10 quadrats, each of area 0.25 m2. What is the density of daisies in the area sampled?

    • 48 per m2
    • 0.48 per m2
    • 1.2 per m2
    • 4.8 per m2

  15. What is the immediate direct effect of predation on a prey population?

    • Decreased population size
    • Reduced genetic diversity
    • Increased birth rate
    • Increased carrying capacity

  16. Which principle states two species cannot occupy the exact same niche indefinitely?

    • Adaptive radiation
    • Ecological succession
    • Resource partitioning
    • Competitive exclusion

  17. What is the main risk if quadrats are not placed randomly across a field?

    • Measurement error
    • Low precision
    • Selection bias
    • High standard deviation

  18. A mark-release-recapture study marks 30 animals. The second sample contains 50 animals, of which 5 are marked. What is the population estimate?

    • 30
    • 500
    • 60
    • 300

  19. How do pioneer species change abiotic conditions for later colonising species?

    • Unchanged
    • More hostile
    • More extreme
    • Less hostile

  20. What happens to a population's size when it exceeds the carrying capacity?

    • It decreases
    • It stays constant
    • It increases
    • It doubles

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