Animal Populations

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Animal Populations
2014-04-29 17:41:37
Biology Populations camturnbull

AQA BIOL4 Populations
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  1. What is an ecosystem?
    The living things in a particular area and the nature of the physical environment
  2. What is a habitat?
    The places in which organisms live
  3. What is a population?
    All the organisms of one species in a habitat
  4. What is a community?
    All the populations of different species in a ecosystem
  5. What are Abiotic Factors?
    • Non living, physical conditions in an ecosystem
    • Temperature 
    • PH
    • Sunlight etc
  6. What is an ecological niche?
    The role of the organism in an ecosystem as defined by its food, competitors, predators ect.
  7. Why is it essential that every species has its own ecological niche?
    It prevents organisms of different species competing for exactly the same resources
  8. What governs the ecological niche occupied by an organism?
    Its adaptations to abiotic factors
  9. Give two examples of how abiotic factors could affect the size of a population
    • The size of plant population in a pond may be limited by the availability of light at greater depths 
    • The size of the population of bacterial cells may be limited due to a change in PH caused by products of their metabolism
  10. What is interspecific competition?
    Competition between members of different species
  11. What is intraspecific competition?
    Competition between members of the same species
  12. What does competition ensure?
    Only the fittest organisms survive long enough to reproduce (natural selection)
  13. How is population controlled by predation?
    • If the number of prey increases them there will be more food for predators so their numbers will also increase.
    • The predators eat more prey so their population decreases, this reduces the availability of food for the predators and their numbers also decline after a period. 
    • The extent of the fluctuation in numbers depends on the range of prey available to the predator