nitrogen cycle

Question 1

nitrogen fixation

Answer 1

nitrogen-fixing bacteria converts nitrogen gas into ammonia which is used to make proteins
when the bacteria dies the protein decomposes and releases ammonia back into the soil

Question 2

decomposition

Answer 2

decomposing Bacteria/fungi break down protein found in dead plants and animals, urine and faeces into ammonia that is released into the soil.

Question 3

nitrification

Answer 3

ammonia is converted into nitrites, then nitrites are converted into nitrates using nitrifying bacteria

Question 4

denitrification

Answer 4

denitrifying bacteria converts some nitrates into nitrogen

Question 5

nitrogen-fixing bacteria

Answer 5

can be found in the soil or in roots nodules found on the roots of legumes and within the root nodules the bacteria gain carbohydrates from the plant and the plant gains a source of nitrates in return. this is a mutualistic relationship.