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Nitrogen Metabolism

NIOS · Class 12 · Biology

Summary of Nitrogen Metabolism for NIOS Class 12 Biology. Key concepts, important points, and chapter overview.

45 questions20 flashcards5 concepts

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Overview

Nitrogen is one of the most essential elements for all living organisms, ranking second only to carbon in biological importance. While the atmosphere contains 78% nitrogen gas (N₂), most organisms cannot directly utilize this atmospheric nitrogen due to the molecule's exceptional stability (triple b

Key Concepts

Nitrogen exists in the atmosphere as

Nitrogen exists in the atmosphere as diatomic nitrogen (N₂) with a triple covalent bond (N≡N) that makes it extremely stable and unreactive under norm

The nitrogen cycle is a continuous

The nitrogen cycle is a continuous process that converts atmospheric N₂ into biologically available forms and returns it back to the atmosphere. Key s

Abiological nitrogen fixation converts N₂

Abiological nitrogen fixation converts N₂ to ammonia without involving living cells. It occurs through two main processes: (1) Industrial fixation via

Biological nitrogen fixation is the enzymatic

Biological nitrogen fixation is the enzymatic reduction of N₂ to ammonia by specialized microorganisms containing the enzyme nitrogenase. Free-living

Symbiotic nitrogen fixation occurs when nitrogen

Symbiotic nitrogen fixation occurs when nitrogen-fixing microorganisms establish special relationships with other organisms. Key examples include: (1)

Learning Objectives

  • Describe the modes of nitrogen fixation including both biological and abiological processes
  • Explain the steps involved in nitrogen fixation by free-living microorganisms
  • Understand symbiotic nitrogen fixation in leguminous plants and the role of Rhizobium
  • Describe the assimilation of nitrate and ammonia by plants through enzymatic reduction
  • Explain amino acid synthesis in plants through reductive amination and transamination reactions

Frequently Asked Questions

What are the important topics in Nitrogen Metabolism for NIOS Class 12 Biology?
Key topics in Nitrogen Metabolism include Nitrogen Metabolism — Complete Chapter Overview, Nitrogen Metabolism: Comprehensive Overview, Nitrogen Metabolism — Complete Overview. These are the concepts NIOS Class 12 examiners draw on most — study them first, then practise related questions.
How to score full marks in Nitrogen Metabolism — NIOS Class 12 Biology?
Understand the core concepts first, then work through the 45 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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All 9 chapters — NIOS Class 12 Biology Chapter Summary

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