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Preservatives, Stains and Reagents — Syllabus

Telangana Open School (TOSS) · Class 12 · Biology

What Preservatives, Stains and Reagents covers in Telangana Open School (TOSS) Class 12 Biology: 3 topics, for the 2026-27 session.

53 questions25 flashcards3 concepts

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3 Topics · Telangana Open School (TOSS) Class 12 Biology · 2026-27

Topics in Preservatives, Stains and Reagents

1

Preservatives

  • Preservatives prevent decay and decomposition of biological tissues.
  • They fix tissues quickly and maintain structural integrity for microscopic study.
  • Common preservatives include Bouin's fluid, Carnoy's fluid, and FAA (Formalin Acetic Alcohol).
2

Stains

  • Stains are chemical dyes used to make cellular components visible under the microscope.
  • Types of staining: Single, Double, Multiple, and Vital staining.
  • Acetocarmine stains chromosomes pink and is used in mitosis studies.
3

Reagents

  • Reagents are chemicals used to detect specific substances in biological samples.
  • Benedict’s and Fehling’s solutions test for reducing sugars.
  • Iodine solution detects starch by turning it blue-black.

Key Concepts

Central concept: Chemicals Used in Biological Studies

PreservativesStainsReagents

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Frequently Asked Questions

What are the important topics in Preservatives, Stains and Reagents for Telangana Open School (TOSS) Class 12 Biology?
Key topics in Preservatives, Stains and Reagents include Preservatives, Stains, Reagents. Study these first, then practise questions on each for the Telangana Open School (TOSS) Class 12 board exam.
How should I revise Preservatives, Stains and Reagents for the Telangana Open School (TOSS) Class 12 board exam?
Learn the core ideas first, then work through the 53 practice questions on Preservatives, Stains and Reagents. 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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