" THE 1 PROCESS OF NITROGEN CYCLE IS FIXATION OF NITROGEN GAS INTO NITROGENOUS COMPOUNDS CAUSED BY THE RIZOMBIUM BACTERIA AND LIGHTENING "

ACCORDING TO THE SYMPOSIS OF THIS LESSON

JUST EXPLAIN IT CLEARLY

AND WHY IS THAT LIGHTENING INVOLVED HERE

The statement in question means Nitrogen fixation by abiotic and biotic factors. Plants cannot absorb atmospheric nitrogen. Instead, they depend upon biological nitrogen fixers, physical processes and fertilizers for nitrogen. The process where by atmospheric nitrogen is converted into usable forms such as nitrates and nitrites is called nitrogen fixation. During lightening and thunder, the high temperature and pressure in the air convert atmospheric nitrogen into oxides of nitrogen. These oxides can dissolve in water to produce nitric and nitrous acids. The acids fall along with rain and are then utilised by various life forms.

Also, Certain forms of bacteria (Rhizobium bacteria) and other organisms such as algae are able to convert atmospheric nitrogen into usable forms such as nitrates and nitrites. Nitrogen-fixing bacteria are commonly found in the roots of legumes (plants of pulses), inside special structures called root nodules. Some nitrogen fixers also live freely in the soil. These usable forms of nitrogen are absorbed by plants to produce many compounds such as amino acids, which in turn form proteins.