Question

write an essay on nitrogen cycle​

Answer 1

Answer:

In nitrogen cycle, free N2 gas of atmosphere is converted into ammonia or oxidised to nitrate at different stages. Blue green algae and N2 fixing bacteria play a significant role in converting the atmospheric gaseous nitrogen into organic nitrogenous compounds and, finally, to nitrate, which is soluble in water.

Explanation:

Answer 2

Answer:

Nitrogen is one of the important elements in biological compounds, mainly of nucleic acid and protein and, therefore, it is essential for life. Atmosphere contains about 78% nitrogen, but free nitrogen cannot be utilised by most of the organisms, except a few blue green algae and some bacteria.

The fixation of nitrogen takes place by physical, chemical and biological means. Small amounts of N2 are converted to ammonia by electrical discharges in atmosphere i.e., by physical force, and settle down on earth by rain. About 30 million metric tonnes of N2 are pro­duced by industry however about 200 million metric tonnes of nitrogen are fixed every year by biological organisms.

Explanation:

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