Monday, 15 April 2013

4.10 describe the stages in the nitrogen cycle, including the roles of nitrogen fixing bacteria, decomposers, nitrifying bacteria and denitrifying bacteria

Nitrogen fixing bacteria turn nitrogen from N2 into ammonia.
Decomposers break down dead animals, urea and egested materials which releases nitrogen into the soil as ammonia.
Nitrifying bacteria convert nitrates into nitrogen.
Denitrifying bacteria break down nitrates into nitrogen which is then released into the atmosphere.

Here is a diagram to help explain:
File:Nitrogen Cycle.svg
commons.wikimedia

This animation is very helpful:
https://www.classzone.com/books/ml_science_share/vis_sim/em05_pg20_nitrogen/em05_pg20_nitrogen.swf
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10 comments:

  1. Marwan12 June 2013 at 02:53

    This comment has been removed by the author.

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  2. Unknown15 June 2014 at 09:04

    I think that nitrifying bacteria convert nitrogen to nitrates, rather than the other way around. I'm fairly sure that nitrates turning into nitrogen is denitrifying bacteria.

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  3. Unknown15 June 2014 at 14:26

    nitrifying bacteria turn nitrites into nitrates

    ReplyDelete
  4. Unknown1 April 2016 at 02:49

    Jake ur a good man

    ReplyDelete
  5. Tiphanie28 December 2016 at 08:51

    I love this youtube channel for science. Here is an animation on the Nitrogen cycle - https://www.youtube.com/watch?v=HOpRT8BRGtk

    ReplyDelete
  6. Unknown7 April 2017 at 04:56

    Nitrogen fixing turn nitrogen into ammonium ions, not ammonia...

    ReplyDelete
  7. Mike Tsang26 June 2017 at 04:04

    The Biology Syllabus has changed…

    Here is a New blog for the 2017 Syllabus:

    http://igcse-biology-2017.blogspot.hk

    ReplyDelete
  8. SophieRice27 June 2017 at 05:57

    more at

    http://igcse-biology-notes.blogspot.hk/2017/06/410-describe-stages-in-nitrogen-cycle_24.html

    ReplyDelete

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