Question

explain the two ways by which nitrogen fixation takes place

Answer 1

HEYA..!!!

Nitrogen fixation is the process which takes place in nature.
This process involves the conversion of Nitrogen (N 2 ) into ammonia (NH 3 ).
There are two methods that change atmospheric nitrogen into usable forms through the process of nitrogen fixation:

[1]. H igh temperature and pressure in the air convert atmospheric nitrogen into oxides of nitrogen during lightning and thunder that can dissolve in water to produce nitric and nitrous acids. These fall along with rain.

[2]. Some forms of bacteria can convert atmospheric nitrogen into usable forms such as nitrates and nitrites. Such nitrogen fixing bacteria are commonly found in the roots of leguminous plants.

These usable forms of nitrogen are absorbed by plants to produce many compounds such as amino acids, which in turn form proteins. 

hope it helps :)

Answer 2

Nitrogen fixation takes place by two ways. They are

1. By the rhizobium bacteria present in pants which converts atmospheric nitrogen into nitrates.

2. Due to lightning. During lighting in storms, the nitrogen in the atmosphere reacts with oxygen to form nitrates.