Nitrogen cycle

HideShow resource information

Saprobionts, Extracellular digestion and Saprobiot

  • Saprobionts are organisms that absorb and digest there food outside of there main body for example Fungi
  • Fungi use digestive enzymes to breakdown dead or dieing organisms, the enzymes break down cells to allow the saprobiontic organisms to absorb the nutrients it needs. This is extracellular digestion
  • It all combines to aid saprobiotic nutrition
1 of 4

Mycorrhizae, Microorganisms and Nitrogen Fixation

  • Mycorrhizal organisms are organisms that grow in the roots of a plant and assist the plant in the uptake of nutrients and help to defend from other fungi in the soil
  • Nitrogen Fixation is the process in which Nitrogen is converted into ammonia
  • Certain microoganisms allow this to occur in the soil in which nitrogen gas is converted into ammonia that plants are able to use to synthesize proteins
2 of 4

Ammonification, Nitrification and Denitrification

  • After a plant or animal dies it expels waste in the form of organic nitrogen, certain bacteria and fungai can convert this nitrogen into ammonia this is called ammonification
  • Nitrification is the oxidation of ammonia to nitrite which is then oxidised to nitrate, this is an important step in the nitrogen cycle in soil
  • Denitrification is the reduction of nitrates back into nitrogen and the specialsed bacterias use the nitrate as the electron acceptor in the place of oxygen in respiration
3 of 4

Nitrogen Cycle

Image result for ammonification (http://image.slidesharecdn.com/lab-10methodsforestimatingnitrificationprocess-130414125520-phpapp02/95/lab10-methods-for-estimating-nitrification-process-4-638.jpg?cb=1365944161)

4 of 4

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Ecology, ecosystems and environmental biology resources »