Populations and ecosystems

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1. Give an advantage of random sampling

  • Avoids bias in the collection of data
  • More scientific
  • Allows for more repeats to be taken
  • A cheaper alternative to systematic sampling
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Other questions in this quiz

2. What could increase human birth rate?

  • A higher proportion of people studying at university
  • Social/cultural practices
  • More contraception
  • Pets

3. What is an ecological niche?

  • The food eaten by one particular species in an area
  • The habitat of a particular group of organisms in the ecosystem
  • All the biotic and abiotic factors required for an organism to survive, reproduce and maintain a viable population
  • All the biotic conditions required for an organism to live in a particular area

4. How would you estimate a population size from mark-release-recapture?

  • [no. marked individuals recaptured * no. in first sample] *100
  • [no. marked individuals * no. marked individuals recaptured]/no. individuals in first sample
  • [no. individuals in first sample * no. in second sample]/no. marked individuals recaptured
  • [no. marked individuals recaptured * no. in second sample]/no. individuals in first sample

5. What is a community?

  • All the populations of different organisms living and interacting in a particular place at the same time
  • All the organisms of one species living in a particular place at the same time
  • All the organisms of one species over the whole Earth
  • Any collection of organisms

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