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Revision Notes

Immunobiology

Telangana Open School (TOSS) · Class 12 · Biology

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

39 questions28 flashcards5 concepts

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Key Topics to Revise

1

Concept of Self and Non-Self

  • The immune system distinguishes between 'self' (the body's own cells) and 'non-self' (foreign substances like pathogens).
  • Immune response is triggered only against non-self components.
  • Failure to distinguish self from non-self can lead to autoimmune diseases.
2

Lines of Defence in the Body

  • First line: Physical and chemical barriers like skin, mucus, lysozyme in tears and saliva.
  • Second line: Innate immune responses including phagocytes (macrophages, neutrophils), natural killer cells, inflammation, and fever.
  • Third line: Adaptive immune response involving lymphocytes (B and T cells) and antibodies.
3

Immune System: Organs and Cells

  • Primary lymphoid organs: Bone marrow (produces all blood cells) and Thymus (matures T-cells).
  • Secondary lymphoid organs: Spleen, lymph nodes, tonsils, Peyer’s patches, MALT—sites where immune responses are initiated.
  • Lymphocytes are of two types: B-cells (produce antibodies) and T-cells (regulate and destroy infected cells).
4

Antigens and Antibodies

  • Antigens are foreign molecules (usually proteins or large polysaccharides) that trigger immune response.
  • Epitope is the specific part of antigen that binds to antibody; paratope is the binding site on antibody.
  • Antibodies (immunoglobulins) are Y-shaped proteins produced by plasma cells derived from B-cells.

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Full Notes

Key Concepts

The immune system can distinguish betweenThe body uses three layersInnate immunity is present from birthBAntigens are foreign molecules (usually proteins)

Frequently Asked Questions

What are the important topics in Immunobiology for Telangana Open School (TOSS) Class 12 Biology?
Immunobiology 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 Immunobiology — Telangana Open School (TOSS) Class 12 Biology?
Understand the core concepts first, then work through the 39 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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