factors affecting population size

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9 Terms

1
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what is an abiotic factor?

non living conditions of an ecosystem

2
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what is a biotic factor?

impact of the interactions between organisms

3
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give 3 abiotic factors which affect pop size:

  • pH

  • availability of water

  • temp

4
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explain how pH affects pop size:

  • a change in pH past the optimum temp may denature the enzymes/transport proteins

  • this causes the movement of substances to decrease 

5
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explain how availability of water affects pop size in plants:

  • low availability of water would decrease the rate of transpiration and photosynthesis as less photolysis occurs

  • so less glucose produced, decreasing growth

6
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explain how availability of water affects pop size in animals:

7
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explain how temperature may affect pop size:

  • if temperature increases past the optimum, enzymes/transport proteins may denature

  • decreasing movement of proteins

8
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give 2 biotic factors that may affect pop size:

  • competition - interspecific and intraspecific competition

  • predation

9
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what is the carrying capacity of a pop?

the maximum pop size it can sustainably support

<p>the maximum pop size it can sustainably support</p>