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Revision Notes
Nitrogen Metabolism — Revision Notes
Telangana Open School (TOSS) · Class 12 · Biology
Nitrogen Metabolism revision notes for Telangana Open School (TOSS) Class 12 Biology: 3 topics in quick points.
52 questions28 flashcards4 concepts
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Key Topics to Revise
1
Nitrogen Cycle Overview
- The nitrogen cycle is a biogeochemical cycle that describes the movement of nitrogen between the atmosphere, soil, and living organisms.
- It consists of five main steps: Nitrogen Fixation, Nitrogen Assimilation, Ammonification, Nitrification, and Denitrification.
- Atmospheric nitrogen (N₂) is inert and must be 'fixed' into ammonia (NH₃) or nitrates (NO₃⁻) before plants can absorb it.
2
Nitrogen Fixation
- Nitrogen fixation is the conversion of atmospheric nitrogen (N₂) into ammonia (NH₃).
- It occurs through abiological (non-living) and biological methods.
- Abiological fixation happens during lightning or via the industrial Haber process.
3
Nitrogen Assimilation and Amino Acid Synthesis
- Plants absorb nitrogen in the form of nitrates (NO₃⁻) or ammonia (NH₄⁺) from the soil.
- Nitrates are reduced to nitrites (NO₂⁻) by nitrate reductase, then to ammonia by nitrite reductase.
- Ammonia is incorporated into amino acids via two main processes: Reductive Amination and Transamination.
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Full NotesKey Concepts
The process of converting atmospheric nitrogenRhizobium bacteria live in root nodulesPlants absorb nitrates (NO₃⁻) fromAmmonia is incorporated into organic molecules
Frequently Asked Questions
What are the important topics in Nitrogen Metabolism for Telangana Open School (TOSS) Class 12 Biology?
Key topics in Nitrogen Metabolism include Nitrogen Cycle Overview, Nitrogen Fixation, Nitrogen Assimilation and Amino Acid Synthesis. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Nitrogen Metabolism for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 52 practice questions on Nitrogen Metabolism. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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