The CBSE board has released the latest Biology curriculum for senior secondary students, featuring a rationalized syllabus based on the NEP 2020 framework that promotes experiential learning and creative thinking, and includes 5 units with 13 chapters; this article provides a comprehensive list of the deleted syllabus for CBSE Class 12 Biology 2023-24 in a unit and chapter-wise format with page numbers for clarity.
CBSE Biology Class 12 Unit-wise Weightage 2023-24
Check the latest CBSE 12th Biology Unit-Wise Marks Distribution:
| Unit | Title | Marks |
| VI | Reproduction | 16 |
| VII | Genetics and Evolution | 20 |
| VIII | Biology and Human Welfare | 12 |
| IX | Biotechnology and its Applications | 12 |
| X | Ecology and Environment | 10 |
| TOTAL | 70 |
Next are the set of deleted topics from the theory and practical syllabus:
| Unit & Chapter | Deleted Topic |
| Unit-VI Reproduction Chapter-1: Reproduction in Organisms | (whole chapter deleted) |
| Unit-VIII Biology and Human Welfare Chapter-9: Strategies for Enhancement in Food Production | (whole chapter deleted) |
| Unit-X Ecology and Environment Chapter-13: Organisms and Populations | Organism and its Environment, Major Aboitic Factors, Responses to Abioitic Factors, Adaptations |
| Unit-X Ecology and Environment Chapter-14: Ecosystem | Ecological Succession and Nutrient Cycles |
| PRACTICALS A. List of Experiments | 2. Collect and study soil from at least two different sites and study them for texture, moisture content, pH and water holding capacity. Correlate with the kinds of plants found in them. 3. Collect water from two different water bodies around you and study them for pH, clarity and presence of any living organism. 4. Study the presence of suspended particulate matter in air at two widely different sites. 8. Study the effect of different temperatures and three different pH on the activity of salivary amylase on starch. |
| PRACTICALS B. Study/observation of the following (Spotting) | 10. Two plants and two animals (models/virtual images) found in xeric conditions. Comment upon their morphological adaptations. 11. Two plants and two animals (models/virtual images) found in aquatic conditions. Comment upon their morphological adaptations. |
| Chapter | Page No. | Dropped Topics/Chapters |
| Chapter 1: Reproduction in Organisms | 3–18 | Full Chapter |
| Chapter 9: Strategies for Enhancement in Food Production | 165–176 178 | Full Chapter |
| Chapter 13: Organisms and Populations | 220 221–222 223–225 225–226 250–252 253–254 254–255 255 | 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 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 | 270–286 | Full Chapter |
The question paper design has also been updated:
| Competencies | |
| Demonstrate Knowledge and Understanding | 50% |
| Application of Knowledge / Concepts | 30% |
| Analyse, Evaluate and Create | 20% |