Populations and ecosystems

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

  • Natural selection
  • Selection pressure
  • Darwin's Law
  • Survival of the fittest
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Other questions in this quiz

2. What is intraspecific competition?

  • Competition between members of the same community
  • Competition between members of the same species
  • Competition between members of different species
  • Competition between members of different habitats

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

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

4. 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

5. Why can cold temperatures affect mammal and bird populations?

  • More energy is used trying to keep warm so their is less energy available for growth and reproduction
  • Shivering causes a decrease in population sizes due to kinetic theory
  • Enzymes act more slowly as they are not at their optimum temperature
  • The enzymes are denatured so substrates cannot bind to their active sites

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