Going to do some f215 revision today. Just concentrated on nitrogen cycle yesterday! Think I may have forgotten It!
Hmm let's see..Nitrogen gas from the atmosphere is used by rhizobium bacteria. These bacteria living in the nodules of the legume sopecies, convert nitrogen gas into ammonia and then into amine compounds. These compounds are transported by the plant to make amino acid then proteins. The rhizobium gains carbohydrates from the plant so is described as a mutualism as both species benefit. Plants support food websn throughout which excretion, production of faeces and death takes place. This is of benefit to the ecosystem, but first decomposition by saprophytic bacteria must take place. A waste product of this process is ammonia. Ammonia is needed by nitrosomonas bacteria for a special type of nutrition (chemo-autotroph). As a result another waste product, nitrite is formed. Nitrite is needed by nitrobacter bacteria for again, a special type of nutrition. The waste product from this is nitrate, which is vital for the growth of the plant and they absorb large quantities via roots. Nitrogen gas is returned to the atmosphere by denitrifying bacteria such as pseudomonas. Actually...