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Nitrogen Metabolism

Telangana Open School (TOSS) · Class 12 · Biology

Quick revision notes for Nitrogen Metabolism — Telangana Open School (TOSS) Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

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 Notes

Key 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?
Nitrogen Metabolism covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Nitrogen Metabolism — Telangana Open School (TOSS) Class 12 Biology?
Understand the core concepts first, then work through the 52 practice questions available for this chapter. Revise formulas and 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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