Populations and ecosystems

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1. What is assumed for the mark-release-recapture process?

  • The marked group form a niche of their own away from the unmarked group
  • The proportion of marked:unmarked in the 2nd sample is greater than the proportion of the population as a whole
  • That the method of marking doesn't make the organism more liable to predation
  • The marked group have a high reproductive rate
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2. What is a community?

  • All the organisms of one species over the whole Earth
  • Any collection of organisms
  • 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

3. What is an ecological niche?

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

4. Why is it difficult to prove that competition causes variations in a population?

  • The data collected is very specific so it is difficult to establish a link
  • Correlation on a graph is not shown
  • Many other factors also influence population size
  • Competition happens very quickly

5. Give an advantage of random sampling

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


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