NCERT Class 12 Biology Book
Table of Contents
- Class 12 Biology Syllabus – Unit & Chapter Overview
- Which Chapters Were Removed from NCERT Biology Class 12?
- NCERT Class 12 Biology Chapterwise PDF Download
- Which Topics Are Most Important for NEET?
- Why Does the NCERT Class 12 Biology Book Matter for Board & NEET Exams?
- Should You Read NCERT Biology Line by Line for NEET?
- What Other NCERT Books Should Class 12 Science Students Download?
eSaral › Class 12 › Biology › NCERT Class 12 Biology Book
Class 12 Biology Syllabus – Unit & Chapter Overview
What Are the 5 Units in NCERT Class 12 Biology?
NCERT biology class 12 is organised into 5 units spanning 13 chapters (not 16 — three chapters were removed in the syllabus rationalisation). The table below reflects the current 2026-27 structure.
| Unit | Unit Name | Chapters (Current) | CBSE Marks |
|---|---|---|---|
| Unit VI | Reproduction | Sexual Reproduction in Flowering Plants, Human Reproduction, Reproductive Health | 16 |
| Unit VII | Genetics and Evolution | Principles of Inheritance and Variation, Molecular Basis of Inheritance, Evolution | 20 |
| Unit VIII | Biology and Human Welfare | Human Health and Disease, Microbes in Human Welfare | 14 |
| Unit IX | Biotechnology | Biotechnology: Principles and Processes, Biotechnology and Its Applications | 12 |
| Unit X | Ecology | Organisms and Populations, Ecosystems, Biodiversity and Conservation | 8 |
| Practical / Internal Assessment | 30 | ||
| Total | 13 chapters | 100 |
Genetics and Evolution (20 marks) carries the highest weightage in NCERT solutions class 12 biology, followed by Reproduction (16 marks) — together these two units account for 36 of the 70 theory marks.
Note: Marks distribution is based on the latest CBSE Class 12 Biology pattern. Always verify with the official CBSE website.
Which Chapters Were Removed from NCERT Biology Class 12?
As part of CBSE's NEP-2020-driven syllabus rationalisation, three chapters have been permanently removed from NCERT Biology Class 12 and are no longer part of the current textbook or exam:
- Reproduction in Organisms (previously Chapter 1)
- Strategies for Enhancement in Food Production (previously Chapter 9)
- Environmental Issues (previously Chapter 16)
If you find an older PDF, guidebook, or website still listing 16 chapters or offering downloads for these three, treat it as outdated — no questions will be asked from them in CBSE boards, JEE, or NEET for the 2026-27 session.
India's Best Exam Preparation for Class 12th - Download Now
NCERT Class 12 Biology Chapterwise PDF Download
All 13 chapters are available as individual PDF downloads below. Click any chapter link to download or read online.
Class 12 Biology syllabus includes topics like Human reproduction, Reproductive health, Evolution, Molecular basics of inheritance, Microbes in human welfare, Ecosystem, Organism, and Populations, etc.
Unit VI – Reproduction (3 Chapters)
| Chapter | Chapter Name | Download Link |
|---|---|---|
| 1 | Sexual Reproduction in Flowering Plants | Download PDF |
| 2 | Human Reproduction | Download PDF |
| 3 | Reproductive Health | Download PDF |
Unit VII – Genetics and Evolution (3 Chapters, Highest Weightage)
| Chapter | Chapter Name | Download Link |
|---|---|---|
| 4 | Principles of Inheritance and Variation | Download PDF |
| 5 | Molecular Basis of Inheritance | Download PDF |
| 6 | Evolution | Download PDF |
Unit VIII – Biology and Human Welfare (2 Chapters)
| Chapter | Chapter Name | Download Link |
|---|---|---|
| 7 | Human Health and Disease | Download PDF |
| 8 | Microbes in Human Welfare | Download PDF |
Unit IX – Biotechnology (2 Chapters)
| Chapter | Chapter Name | Download Link |
|---|---|---|
| 9 | Biotechnology: Principles and Processes | Download PDF |
| 10 | Biotechnology and Its Applications | Download PDF |
Unit X – Ecology (3 Chapters)
| Chapter | Chapter Name | Download Link |
|---|---|---|
| 11 | Organisms and Populations | Download PDF |
| 12 | Ecosystems | Download PDF |
| 13 | Biodiversity and Conservation | Download PDF |
Which Topics Are Most Important for NEET?
For NEET, Biology carries 360 marks out of 720 — the highest of any subject. From NCERT Biology Class 12, the highest-weightage topics are:
- Genetics and Evolution (highest unit weightage, 20 marks) — consistently 8–10 NEET questions
- Human Reproduction and Reproductive Health — 4–6 questions
- Molecular Basis of Inheritance — consistently high priority
- Ecology (now 3 chapters, not 4) — 3–4 questions each year
Why Does the NCERT Class 12 Biology Book Matter for Board & NEET Exams?
The NCERT Class 12 Biology textbook is the single most important resource for both CBSE board exams and NEET. According to NTA's official NEET syllabus, approximately 50–60% of Biology questions in NEET are directly based on NCERT Class 11 and Class 12 Biology textbooks. For board exams, NCERT is the prescribed textbook — every question in CBSE finals can be traced to it.
Written by top subject-matter experts and approved by the Central Board of Secondary Education (CBSE), this textbook builds concepts progressively — from cellular reproduction to complex ecological relationships. The language is precise, the diagrams are exam-standard, and every chapter ends with NCERT exercise questions that frequently appear in board papers.
Students preparing for NEET with eSaral's Kota-quality faculties consistently cite NCERT mastery as the backbone of their scores. If you can recall every diagram, definition, and example in this book, you have already cleared the most important hurdle in both exams.
For complete solutions to the exercise questions in this book, refer to NCERT Solutions for Class 12 — chapterwise, step-by-step answers written by expert faculty.
Should You Read NCERT Biology Line by Line for NEET?
Yes — and this is not an exaggeration. NEET questions are often framed using the exact phrasing from NCERT. Here is a structured reading approach used by toppers:
1. First Read — Read the full chapter without stopping. Build familiarity with concepts and flow.
2. Second Read — Highlight definitions, bold terms, and diagram labels. Write these in your own words.
3. Third Read (Revision) — Cover the text and try to recall key points. Use NCERT exercise questions as a self-test.
4. Diagram Practice — Redraw all labelled diagrams from memory. This alone improves retention by 40–50% based on spaced repetition research.
5. NCERT Solutions Cross-check — After attempting exercise questions, compare with NCERT Solutions for Class 12 Biology to identify gaps.
What Other NCERT Books Should Class 12 Science Students Download?
Biology is only one part of the CBSE Class 12 science stream. Make sure you also have:
- NCERT Class 12 Chemistry Book PDF — essential for both NEET and JEE
- NCERT Class 12 Physics Book PDF — critical for JEE Main and Advanced
- All NCERT Books for Class 12 — one-stop page for all subjects
Benefits of using NCERT books
- It provides In-depth knowledge
- Helps to learn concepts easily
- NCERT books offer extensive knowledge about the subject
- NCERT Books offer Eye-Catching illustrations that help to understand complex topics easily
- These books are prepared by top subject experts.
- Easy to understand.
So, that’s all from this article. I hope you enjoyed this post. If you found this article helpful, then please share it with other students.
Also Read,
Chemistry class 12 NCERT book
If you have any Confusion related to the NCERT Class 12 Biology book, then feel free to ask in the comments section below.
To watch Free Learning Videos on Biology by Kota’s top faculties, install the eSaral App
Frequently Asked Questions
Find answers to common questions.
Is NCERT Class 12 Biology enough for NEET preparation?
NCERT Class 12 Biology is the foundation for NEET, but it is not fully sufficient on its own. NEET requires you to master both Class 11 and Class 12 NCERT Biology thoroughly — approximately 95% of Biology questions are NCERT-based. For the remaining 5% application-based questions, additional practice with NEET mock tests and previous year papers is necessary.
Can I download the NCERT Class 12 Biology book as a single PDF?
Yes. The complete NCERT Class 12 Biology book is available as a single PDF on the official NCERT website (ncert.nic.in) and as individual chapterwise PDFs through the links provided on this page. The chapterwise format is more practical for targeted revision.
Is NCERT Class 12 Biology available in Hindi PDF?
Yes. The NCERT Class 12 Biology book is officially available in Hindi as "Jeev Vigyan" on the NCERT website (ncert.nic.in) under the Hindi medium textbook section. You can download each chapter in Hindi PDF format free of cost.
How is NCERT Class 12 Biology different from Class 11?
Class 11 NCERT Biology covers foundational topics — cell biology, plant physiology, human physiology, and the diversity of life. Class 12 builds on this foundation with applied topics like reproduction, genetics, biotechnology, and ecology. Both are equally important for NEET; together they form the complete Biology syllabus tested by NTA.
Which chapter of Class 12 Biology is most important for NEET?
Molecular Basis of Inheritance and Principles of Inheritance and Variation, both from the highest-weighted Genetics and Evolution unit (20 marks), are consistently the most NEET-critical chapters in ncert biology class 12.
Which chapters were removed from NCERT Class 12 Biology?
Reproduction in Organisms, Strategies for Enhancement in Food Production, and Environmental Issues were removed from ncert biology class 12 as part of CBSE's syllabus rationalisation, and no questions are asked from them in the current session.
How many chapters are in the NCERT Class 12 Biology book?
The NCERT Class 12 Biology textbook currently has 13 chapters organised across 5 units for the 2026-27 session: Reproduction (3 chapters), Genetics and Evolution (3 chapters), Biology and Human Welfare (2 chapters), Biotechnology (2 chapters), and Ecology (3 chapters). Three earlier chapters — Reproduction in Organisms, Strategies for Enhancement in Food Production, and Environmental Issues — have been removed.