CBSE Class 12 Biology Syllabus 2026-27 PDF, Marks Distribution, Exam pattern &Unit Wise Breakdown
CBSE has released Class 12 Biology syllabus for the academic year 2026-27 as an important resource for all science stream students. The syllabus covers five core units: Reproduction, Genetics and Evolution, Biology and Human Welfare, Biotechnology, and Ecology. The theory paper consists of 70 marks with 30 marks for practicals. Students, must focus on diagrams, NCERT textbooks and previous year questions.
CBSE Class 12 Biology Syllabus 2026-27 Overview:
CBSE Class 12 Biology syllabus 2026-27 is a blueprint designed for students preparing for board exams and competitive medical entrance test NEET. It includes five core units: Reproduction, Genetics and Evolution, Biology and Human welfare, Biotechnology and its Applications, and Ecology and Environment, combining theory and practical components for a total of 100 marks. The syllabus covers both conceptual understanding and practical skills, including experiments, slide preparation, spotting, viva, and project work.
CBSE Class 12 Biology Syllabus 2026 Marks Distribution
Students can also use the unit-wise mark distribution of the CBSE Class 12 Biology Syllabus 2026-27 to highlight relevant topics for last-minute revision. The syllabus’s PDF download link is provided at the end.
CBSE Class 12 Biology Syllabus 2026
The Class 12 Biology syllabus is divided into 5 main units, each covering important concepts in detail. Every unit includes 3 to 4 chapters that help students build a clear understanding of the subject. This syllabus not only improves knowledge but also makes learning interesting and meaningful for the students.
Unit-VI Reproduction
Chapter 1: Sexual Reproduction in Flowering Plants
- Flower and gametophytes
- Pollination
- Fertilization
- Post- fertilisation
- Special modes
- Significance
Chapter 2: Human Reproduction
- Reproductive systems
- Gametogenesis
- Cycle and fertilisation
- Development
- Birth and feeding
Chapter 3: Reproductive Health
- Awareness
- Birth control
- Diagnosis
- Infertility
Unit-VII Genetics and Evolution
Chapter 4: Principles of Inheritance and Variation
- Basics
- Deviations from Mendelism
- Polygenic inheritance
- Chromosomal basis
- Sex determination
- Linkage
- Sex-linked inheritance
- Genetic disorders
Chapter-5: Molecular Basis of Inheritance
- Genetic material
- Structure
- Replication and flow of information
- Gene regulation
- Genomics
- Application
Chapter-6: Evolution
- Origin and evidence
- Theories
- Mechanism
- Population genetics
- Other topics
Unit-VIII: Biology and Human Welfare
Chapter-7: Human Health and Diseases
- Pathogens and parasites
- Immunology
- Other diseases
- Adolescence
Chapter-8: Microbes in Human Welfare
- Application
- Agriculture
- Antibiotics
Unit-IX Biotechnology and its Applications
Chapter-9: Biotechnology – Principles and Processes
Genetic Engineering (Recombinant DNA Technology).
Chapter-10: Biotechnology and its Applications
- Health and agriculture
- Genetically modified issues
- Ethical and legal issues
Unit-X Ecology and Environment
Chapter-11: Organisms and Populations
- Population interactions
- population attributes
Chapter-12: Ecosystem
Ecosystems: Patterns, components; productivity and decomposition; energy flow; pyramids of number, biomass, energy.
Chapter-13: Biodiversity and its Conservation
- Biodiversity
- loss of biodiversity
- biodiversity conservation
CBSE Class 12 Biology Exam Pattern 2026-27 key Highlights:
Here’s table summarising the exam paper pattern:
| Section | Number of Question | Marks per Question | Total Marks | Question Type |
| Section A | 16 | 1 | 16 | Short answer type |
| Section B | 5 | 2 | 10 | Short answer type |
| Section C | 7 | 3 | 21 | Medium answer question |
| Section D | 2 | 4 | 8 | Case-based question |
| Section E | 3 | 5 | 15 | Long answer question |
CBSE Class 12 Biology Syllabus 2026-27 PDF
CBSE Class 12 Biology Syllabus for 2026-27 is now available at the official website of the Central Board of Secondary Education (CBSE). This comprehensive guide not only lists all the important chapters and topics but also explains the exam pattern, question paper structure, and internal assessment process. Download the PDF from the link below to get started on your preparation journey.
