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Nitrogen Metabolism

Telangana Open School (TOSS) · Class 12 · Biology

Summary of Nitrogen Metabolism for Telangana Open School (TOSS) Class 12 Biology. Key concepts, important points, and chapter overview.

52 questions28 flashcards4 concepts

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Overview

Nitrogen is a vital element for life because it forms part of essential biomolecules like amino acids and nucleic acids. However, most organisms cannot use atmospheric nitrogen (N₂) directly. The nitrogen cycle ensures that nitrogen is converted into usable forms through various physical, chemical,

Key Concepts

The process of converting atmospheric nitrogen

The process of converting atmospheric nitrogen (N₂) into ammonia (NH₃) or related compounds. It occurs through abiotic methods like lightning and indu

Rhizobium bacteria live in root nodules

Rhizobium bacteria live in root nodules of leguminous plants like gram, pea, and bean. They convert atmospheric nitrogen into ammonia. The host plant

Plants absorb nitrates (NO₃⁻) from

Plants absorb nitrates (NO₃⁻) from the soil and reduce them to nitrites (NO₂⁻) using nitrate reductase, then to ammonia (NH₃) using nitrite reductase.

Ammonia is incorporated into organic molecules

Ammonia is incorporated into organic molecules through two main processes: Reductive amination, where α-ketoglutaric acid combines with ammonia to for

Learning Objectives

  • Describe the kinds of physical and biological nitrogen fixation.
  • Know the steps involved in nitrogen fixation by free-living organisms.
  • Explain the mode of symbiotic nitrogen fixation in legumes.
  • Describe the assimilation of nitrate and ammonia by plants.
  • Explain amino acid synthesis in plants.

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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