Distribution of Organisms B2

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Why do organisms live in different areas?

Organisms are distributed across different habitats dependant on environmental factors.

Environment factors include-

  • Temperature
  • Availablity of water
  • Availablity of oxygen and carbon dioxide
  • Availablity of nutrients
  • Amount of light

These factors lead to different areas hosting different amounts of the same organism.

The two ways to study distribution are-

  • Measuring the amount of an organism in an area using quadrats and then drawing a comparison with the amount in another area
  • Studying how distribution changes across an area by placing quadrats across a transect

Using Quadrats

1) Place a 1m*1m square quadrat on


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