Gases, Biology

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GASES

  • There are 4 gases in the protoplasm which remain dissolved in its free water.
  • These 4 gases are follows-

                 CO   >  O2 > N2  > H2

  • COis used in biosynthesis of urea.
  • COhelps in the dissociation of oxyhaemoglobin.
  • In green cells of protists, algae and plants, COis used in photosynthesis as a raw material for glucose formation.
  • O2 is used in oxidation of substances.
  • Ois a reactive gas. It release energy by oxidation of food, and is vital for life.
  • H2 is used in ETS.
  • N2 is an inert gas, and takes no part in cell reactions.
  • Certain organism can make atmospheric nitrogen a component of organic compounds. This process is called nitrogen fixation and the organism capable of this are termed nitrogen fixing organisms, e.g. Azotobacter, Nostoc, Rhizobium.
  • NHis a toxic compound because of a potentially high pH after reaction with water.
  • In lower animals, it leaves the cell by diffusion.
  • In higher animals, it is changed into urea for elimination by special excretory organs.
  • Nitrosomonas can oxidase NH3 to NO- and Nitrobacter and Penicillium, oxidase NO- to NO-. This process is called nitrification. The organism capable of this process are called nitrifying organism.

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