Class 12 Biology CBSE Syllabus 2026-27: Updated
Updated for 2026-27: this guide follows the CBSE senior secondary curriculum listed for 2026-27 on cbseacademic.nic.in. Some subject PDFs there still carry a 2025-26 label inside, so check the official PDF for your subject before you finalise your plan.
Class 12 Biology sets you up with the knowledge of life systems, genetics, evolution, and the environment. Modern biology is dealt with in the syllabus. It relates you to current biological problems from molecules to ecosystems. Let's have a detailed look at each topic and subtopic.
Practising past papers is the best way to use this syllabus. Gradehunt’s CBSE Class 12 Biology test series gives you chapter-wise and full-syllabus papers with detailed evaluation, so you know where you lose marks before the board exam.
CBSE Class 12 Biology syllabus for 2025–26:
The syllabus is divided into five key units, covering both plant and animal biology, as well as biotechnology and ecology. Here's a quick look at the complete unit-wise distribution:
| Unit No. | Unit Title | Key Topics and Subtopics |
|---|---|---|
1. | Reproduction | - Flowering plant sexual reproduction - Male and female reproductive system organisation and functioning in human beings - Gametogenesis - Fertilisation - Implantation - Embryonic development - Menstrual cycle - Parturition - Lactation |
2. | Genetics and Evolution | - Mendel's laws - Single gene and two gene inheritance - Chromosomal theory - Sex determination - Mutations - Genetic disorders - DNA structure - Replication - Transcription - Translation - Genetic code - Human genome project - DNA fingerprinting - Darwin's theory - Speciation - Adaptive radiation - Evidences of evolution |
3. | Biology and Human Welfare | - Microbes in domestic and industrial products - Antibiotics - Microbes in sewage treatment - Biocontrol agents - Biofertilisers - Drug and alcohol addiction - Prevention and control |
4. | Application of Biotechnology | - Principles of biotechnology - Tools such as restriction enzymes and plasmids - Cloning - PCR - Applications in agriculture (Bt cotton) - Medicine (insulin) - Transgenic organisms - Ethical concerns - Biosafety |
5. | Ecology and Environment | - Ecosystems - Energy flow - Food chain - Ecological pyramids - Ecological succession - Levels of biodiversity and conservation - Hotspots - Endangered species - Air, water, soil, noise pollution - Solid waste management - Greenhouse effect - Ozone layer depletion |
Conclusion
The syllabus promotes thinking and applicability. It's not memorising facts. It's learning to understand life, sustainability, and your place in the world of living organisms. Get curious, and Biology would never be a chore.