Biology

Question 1

Nitrification

Answer 1

-Ammonia converted into nitrates
-carried out by nitrifying bacteria
-nitrifying bacteria needs oxygen as they are aerobic
-this process is quickened with presence of oxygen and high temperatures

Question 2

Decomposition

Answer 2

-bacteria and fungi break down protein found in dead plants and animals, urine and faeces into ammonia

Question 3

Nitrogen fixation

Answer 3

-Nitrogen gas converted into nitrates
-Carried out by nitrogen fixing bacteria
-these bacteria’s need oxygen as they are aerobic
-process quickened by oxygen and high temperatures
-nitrogen fixing bacteria can be found free in soil and in root nodules
-These bacteria’s gain carbohydrates from plant and in return plant gains nitrates

Question 4

Denitrification

Answer 4

-Nitrates are converted into nitrogen gas
-carried out by denitrifying bacteria
-denitrifying bacteria don’t need oxygen as they are anerobic and thrive in waterlogged soils