Nitrogen Cycle - Natural Resources | Class 9 Biology | 2023-24

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✅ In this video,

✔️ Class: 9th
✔️ Subject: Biology
✔️ Chapter: Natural Resources
✔️ Topic Name: Nitrogen Cycle
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00:00 Introduction: Nitrogen Cycle
00:35 Nitrogen Cycle?
21:28 Website Overview
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Points covered in this video:-
Nitrogen gas makes up 78% of our atmosphere.
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 biologically important compounds such as alkaloids and urea too.
Nitrogen is thus an essential nutrient for all life-forms.
Other than a few forms of bacteria, life-forms are not able to convert the comparatively inert nitrogen molecule into forms like nitrates and nitrites which can be taken up and used to make the required molecules.
These ‘nitrogen-fixing’ bacteria may be free-living or be associated with some species of dicot plants.
Commonly, the nitrogen-fixing bacteria are found in the roots of legumes.
Plants (which give us pulses) - Special structures called root nodules.
Other manner in which the nitrogen molecule is converted to nitrates and nitrites is by a physical process.
During lightning, the high temperatures and pressures created in the air convert nitrogen into oxides of nitrogen.
These oxides dissolve in water to give nitric and nitrous acids and fall on land along with rain.
These are then utilised by various life forms. .

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Видео Nitrogen Cycle - Natural Resources | Class 9 Biology | 2023-24 канала Magnet Brains