CBSE Class 12 Biology Deleted Syllabus 2025-26: The Central Board of Secondary Education (CBSE) has rationalized the syllabus for Class 12 Biology for the academic session 2025-26, continuing its effort to streamline the curriculum and emphasize core concepts. This updated syllabus removes several complete chapters and specific detailed topics, particularly from Unit-VI (Reproduction), Unit-VIII (Biology and Human Welfare), and Unit-X (Ecology and Environment). This crucial rationalization ensures students focus intensely on essential biological principles, genetics, and biotechnology, aligning the content with the National Education Policy (NEP).
CBSE Class 12 Biology Deleted Syllabus 2026
From the below table students can check the Biology deleted syllabus which is being implemented in the current academic session 2025-26:
Units | Chapters | Deleted Topics |
| Unit-VI: Reproduction | Chapter 1: Reproduction in Organisms | Complete Chapter |
| Unit-VIII: Biology and Human Welfare | Chapter 9: Strategies for Enhancement in Food Production | Complete Chapter |
| Unit-X: Ecology and Environment | Chapter 13: Organisms and Populations | 13.1 Organism and Its Environment • 13.1.1 Major Abiotic Factors • 13.1.2 Responses to Abiotic Factors • 13.1.3 Adaptations • Summary (para 2) Ques. 1, 2, 3, 9, 10, 11, 12 |
| Chapter 14: Ecosystem | 14.6 Ecological Succession • 14.6.1 Succession of Plants 14.7 Nutrient Cycling • 14.7.1 Ecosystem – Carbon Cycle • 14.7.2 Ecosystem – Phosphorus Cycle 14.8 Ecosystem Services | |
| Chapter 16: Environmental Issues | Full Chapter |
CBSE 10th Biology: Practical Syllabus Deleted
Practicals A (Experiments Removed):
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Practicals B (Spotting Exercises Removed):
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