describe nitrogen cycle
Answers
1.nitrogen fixation
2.nitrification
3.assimilation
4.ammonification
5.denitrification
the nitrogen cycle is nothing but the cycling process of using nitrogen and sending back to it's source.
1.nitrogen fixation:the process in which the atmospheric nitrogen is converted into a compound or a suitable form which can be absorbed by symbiotic organisms like rhizobium which provide nutrients to plants especially nitrogen.
2.nitrification:nitrates can also be converted into ammonia by dentrifying bacteria in soil.this can be converted into proteins,nucleic acids,nitrites and nitrates.nitrites are produced mainly by nitrosomonas .death of these nitrosomonas add nitrogeneous compounds to the soil.and it is absorbed by plants.
3.assimilation:nitrogen compounds mainly ammonium ions are taken up from soilsby plants which are then used in the formation of plant proteins and animals eat these plants,animal proteins are synthesised.
4.ammonification: production of ammonia from nitrates is called ammonification.
5.denitrification:the release of nitrogen back to the atmosphere is called denitrification.
Answer:
• The atmospheric nitrogen cannot be taken directly by the plants and animals.
• Certain bacteria and blue green algae process of soil fix nitrogen from atmosphere, can convert it into compounds of nitrogen.
• After the conversion, these usable compounds are utilised by plants from the soil through their root system.
• Nitrogen stain used for synthesis of plant protein and other compounds.
• Animals feeding on plants get these proteins and other nitrogen compounds.
• When plants and animals die, bacteria and fungi present in the soil convert the nitrogenous wastes into nitrogenous compounds to be used by the plants again.
• Certain other bacteria convert some part of them nitrogen gas which goes back into the atmosphere.
•As a result, the percentage of nitrogen in the atmosphere remains more or less constant.
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