Populations and ecosystems

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

  • Correlation on a graph is not shown
  • Many other factors also influence population size
  • The data collected is very specific so it is difficult to establish a link
  • Competition happens very quickly
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2. How would you estimate a population size from mark-release-recapture?

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

3. 'Only those individuals who are able to escape predators/withstand disease/withstand an adverse climate will survive to reproduce'. What is this termed?

  • Selection pressure
  • Natural selection
  • Survival of the fittest
  • Darwin's Law

4. What could increase human birth rate?

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

5. 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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