Organisms in their Environment

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Photosynthesis:

can be carried out by green plants and algae

chlorophyll--> absorbs the suns light energy

PHOTOSYNTHESIS-

carbon dioxide + water ---> glucose + oxygen

process for photosynthesis- 

1) carbon dioxide is taken into the leaves + water taken up into the roots

2) chlorophyll traps the light energy

3) energy is used to convert the carbon dioxide and water into glucose (sugars)

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Limiting Factors:

LIGHT- lack of this would slow down the rate of photosynthesis as light provides energy for this process.

TEMPERATURE-  if its cold, the enzymes do not work as efficiently and will slow down the rate of photosynthesis

CARBON DIOXIDE LEVELSif these levels are too low, there will be less photosynthesis

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How plants use glucose:

the glucose produced by photosynthesis may be:

  • converted into insoluble starch for storage
  • converted into fats and oils
  • used to produce cellulose
  • used to produce proteins

mineral elements-

  • nitrogen-- nitrates-- protein/ amino acid
  • magnesium-- magnesium ions---making chlorophyll
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Organisms in their Environment

physical factors that may affect the distribution of organisms-

  • temperature
  • availability of nutrients
  • amount of light
  • availablility of water
  • availability of oxygen
  • availability of carbon dioxide
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