Give the process of nitrogen fixation in soil with equations.
The nitrogen present in atmosphere is biologically fixed by the bacteria into ammonia. This ammonia undergo the process of nitrification leading to the formation of nitrates-
The nitrate so formed can be easily absorbed by the plants, and transported to leaves. Animals get their nitrogen by consuming plants.
When plants & animals die, nitrates are reduced back to nitrogen in the atmosphere, this process is known as denitrification & the bacteria which carry out this process are known as denitrifying bacteria for example- Pseudomonas.