what is "Nitrogen cycle" describein brief Nitrogen cycle
Answers
Explanation:
nitrogen circulates between the atmosphere, soil and living organism. The circulation of nitrogen between the atmosphere, soil and living organism is known as nitrogen cycle
Nitrogen gas makes up 78% aap our atmosphere and nitrogen is also a part of many molecules essential to life like proteins nucleic acids (DNA and RNA) and some vitamins. nitrogen is found in other biological important compounds such as alkaloids and urea too.
nitrogen is thus and essential nutrient for all like forms and life would be simple if all these life-forms could use the atmospheric nitrogen directly .
however, other than a few forms of bacteria.
life forms are not able to convert the comparatively inert nitrogen molecules into form like nitrates and nitrites which can be taken up and used to make the required molecules .
these nitrogen fixing bacteria maybe free living or be associated with some species of dicot plants.
most commonly the nitrogen fixing bacteria are found in the roots of legumes ( generally the plants which give us pulses ) in special structures called root nodules.
other than these bacteria. the only other manner in which the nitrogen molecule is converted to nitrates and nitrites is by physical process .
during lightning the high temperatures and pressures created in the air Convent nitrogen into oxides of Nitrogen.
these oxides dissolve inverter to give nitric and nitrous acid and fall on land along with rain .
There are then utilised by various life forms .
