ISC 12th Biology Marks Distribution 2026 Chapter-Wise
The ISC Class 12 Biology Marks Distribution 2026 shows how marks are given chapter-wise. It helps students understand which units carry more weight.
ISC 12th Biology Paper: The 2026 ISC Class 12 Biology marks distribution will provide the clear structure of marks for the theory portion i.e. ( 70 marks ) amongst various units and chapters. This pattern will give students an idea about the chapters (units Genetics, Evolution & Ecology, etc .) that have higher weightage in terms of marks. With this blueprint, students will be able to plan their revision in a better way by allocating more time to those sections that are high scoring and strengthening fundamental concepts that frequently appear in exams.
By knowing the chapter-wise weightage in advance, students can approach their preparation with better clarity and confidence. The distribution shows a good balance between theory, diagrams, application-based questions, and descriptive answers. It also helps in devising a focused study plan without missing a major unit while studying at home.
ISC Class 12 Biology Paper Unit-Wise Weightage Marks 2026
The table below highlights the ISC Class 12 Biology unit-weightage 2026 here:
Unit No. | Unit Name | Marks |
I | Reproduction | 14 |
II | Genetics & Evolution | 20 |
III | Biology & Human Welfare | 14 |
IV | Biotechnology | 10 |
V | Ecology & Environment | 12 |
Total | 70 | |
ISC Class 12 Biology 2026 – Chapter-Wise Detailed Blueprint
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Below is the chapter-wise weightage based on the 2026 ISC Biology syllabus structure.
Unit | Chapter Name | Weightage (Approx.) |
Unit I: Reproduction | Reproduction in Organisms | 3 |
Sexual Reproduction in Flowering Plants | 4 | |
Human Reproduction | 4 | |
Reproductive Health | 3 | |
Total | 14 Marks | |
Unit II: Genetics & Evolution | Principles of Inheritance & Variation | 7 |
Molecular Basis of Inheritance | 8 | |
Evolution | 5 | |
Total | 20 Marks | |
Unit III: Biology & Human Welfare | Human Health & Diseases | 5 |
Strategies for Enhancement in Food Production | 5 | |
Microbes in Human Welfare | 4 | |
Total | 14 Marks | |
Unit IV: Biotechnology | Biotechnology: Principles & Processes | 5 |
Biotechnology & Its Applications | 5 | |
Total | 10 Marks | |
Unit V: Ecology | Organisms & Populations | 3 |
Ecosystem | 3 | |
Biodiversity & Conservation | 3 | |
Environmental Issues | 3 | |
Total | 12 Marks | |
PDF: ISC 12th Biology Marks Distribution 2026 Chapter-Wise
The ISC Biology exam for 2026 consists of a 70-mark theory paper and a 30-mark practical exam. The theory paper includes a mix of MCQs, short answers, and long descriptive questions, along with compulsory diagrams. Using this blueprint wisely can make exam preparation smoother and improve overall scoring potential.
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