Question

2. a) Describe three ways in which nitrogen is changed into nitrates. [3]
b) How are nitrates changed back into nitrogen?

Answer 1

Answer:

Answer as follows

Explanation:

a) Nitrifying bacteria in the soil convert ammonia into nitrite(NO2) and then into nitrate(NO3).This process is called nitrification.

b)Nitrogen gas from the atmosphere is fixed into organic nitrogen by nitrogen-fixing bacteria.