Populations and ecosystems

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1. What is an ecological niche?

  • 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
  • The food eaten by one particular species in an area
  • All the biotic conditions required for an organism to live in a particular area
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2. 'Only those individuals who are able to escape predators/withstand disease/withstand an adverse climate will survive to reproduce'. What is this termed?

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

3. What are all the interacting biotic and abiotic features in a specific area known as?

  • Biosphere
  • Community
  • Ecosystem
  • Habitat

4. 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

5. Why are predator-prey cycles unreliable?

  • We do not know how many repeats have been taken
  • The predator actually has a larger range of food than just the one prey species
  • Methods used to collect data involve systematic sampling so are not valid
  • The scientists conducting experiments are imbeciles


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