nitrogen cycle

• micro- organisms that fix nitrogen gas -

  nitrogen fixing bacteria
• micro-organisms that turn ammonium compounds into nitrates -

  nitrifying
• micro-organisms that turn nitrates into nitrogen gas -

  de-nitrifying
• micro-organisms that turn detritus into ammonium compounds -

  decomposers
• a source of nitrogen for plants -

  nitrates
• the biological molecule of inheritance that requires nitrogen to be made -

  DNA
• a source of nitrogen for primary consumers -

  producers
• a source of nitrogen for secondary consumers -

  primary consumers
• what organisms use nitrogen for -

  amino acids
• the type of plant that is particularly good at fixing nitrogen -

  legumes
• the structure in leguminous plants that houses nitrogen fixing bacteria -

  root nodules
• the type of relationship between nitrogen fixing bacteria and leguminous plants -

  mutualistic