CBSE Class 12th Science
🧬 Class 12th Biology Syllabus & Marks Weightage
Official CBSE 2025-2026 curriculum and unit-wise weightage distribution. Use this blueprint to prioritize high-weightage chapters and maximize your board exam score.
Theory Examination
70 Marks
Internal / Practical
30 Marks
Total Units
5 Units
Exam Duration
3 Hours
01
Reproduction
16 Marks
22.9%
02
Genetics and Evolution
20 Marks
28.6%
03
Biology and Human Welfare
12 Marks
17.1%
04
Biotechnology and Its Applications
12 Marks
17.1%
05
Ecology and Environment
10 Marks
14.3%
💡 CBSE Class 12 Biology Preparation Strategy
- Focus on units carrying 8 or more marks first to secure high scoring foundational sections early.
- Solve the last 10 years of CBSE previous year question papers to master recurring derivation and question patterns.
- Download comprehensive chapter notes and step-by-step marking schemes inside the official Class 12th CBSE mobile application.