Biology — Syllabus & Chapters

The complete syllabus for Biology — every chapter you need to study, and how the exam paper is structured.

What you will study (chapters)

Chapter 1: Reproduction in Organisms
Chapter 2: Sexual Reproduction in Flowering Plants
Chapter 3: Human Reproduction
Chapter 4: Reproductive Health
Chapter 5: Principles of Inheritance and Variation
Chapter 6: Molecular Basis of Inheritance
Chapter 7: Origin of Life
Chapter 8: Evidences and Theories of Biological Evolution
Chapter 9: Human Evolution
Chapter 10: Human Health and Diseases
Chapter 11: Strategies for Enhancement in Food Production
Chapter 12: Microbes in Human Welfare
Chapter 13: Principles and Processes of Biotechnology
Chapter 14: Biotechnology and Its Applications
Chapter 15: Organisms and Populations
Chapter 16: Ecosystem
Chapter 17: Biodiversity and Its Conservation
Chapter 18: Environmental Issues

Frequently asked questions

How many chapters are there in Biology?

The Biology syllabus has 18 chapters, listed in full above. Cover the high-weightage chapters first using the exam pattern as a guide.

How do I know which Biology chapters carry the most marks?

Compare the chapter list above with the exam pattern and the last few years of question papers — the topics that appear most often and the units with the highest marks are where to focus first. Always confirm weightage against the official syllabus for your exam year.

Has the Biology syllabus changed this year?

Boards occasionally revise the syllabus or remove topics for a session. Always download the official syllabus for your exact exam year from the official ICSE & ISC portal rather than relying on an older copy or a social-media list.

How can I prepare for Biology faster?

Begin with the most-frequently-asked topics and the last few years of question papers, then test yourself under timed conditions. If you want guided help, you can use the free AI study tutor for Biology — practise past-paper questions and get instant feedback — or a focused Biology study guide that condenses the syllabus into the topics that matter most — both are free to start.