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ISC Class 12 Biology: Chapter-wise Notes and PYQs

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ISC · Class 12 · 2026-27

ISC Class 12 Biology: chapter-wise study guide

All 13 chapters of ISC Class 12 Biology for the 2026-27 session. Each chapter page explains the ideas, gives tricks to remember them, shows where students lose marks, and links to practice.

  • 13 chapters
  • 39 topic pages
Start with the first chapter

Exam note: Paper 1 (Theory) is a 3-hour, 70-mark board paper on the Class XII syllabus, plus 15 minutes reading time. Paper 2 (Practical, 15 marks), Project Work (10) and Practical File (5) make up the other 30 marks.

Reproduction

  1. Sexual Reproduction in Flowering Plants

  2. Human Reproduction

  3. Reproductive Health

Genetics and Evolution

  1. Principles of Inheritance and Variation

  2. Molecular Basis of Inheritance

  3. Evolution

Biology and Human Welfare

  1. Human Health and Diseases

  2. Microbes in Human Welfare

Biotechnology and its Applications

  1. Biotechnology - Principles and Processes

  2. Biotechnology and its Applications

Ecology and Environment

  1. Organisms and Populations

  2. Ecosystem

  3. Biodiversity and its Conservation

Syllabus source: CISCE ISC 2027 Biology syllabus, CISCE ISC 2027 Biology Paper 1 specimen question paper and answer key