ISC Class 12 Biology Weightage 2026 Unit and Chapter-Wise Marks Distribution

ISC Class 12 Biology Weightage 2026 was announced through the syllabus PDF available online at cisce.org. You can ind a total of 5 units in the ISC Class 12 Biology Syllabus 2025-26 , such as Reproduction of 16 marks, Genetics and Evolution & Ecology and Environment of 15 marks each, Biology and Human Welfare of 14 marks, Biotechnology and Its Applications of 10 marks. Overall, the theory paper will be of 70 marks, and you will have to appear for the practical paper for 30 marks. In the practical exam, do not forget to carry your project and practical file. The final question paper of theory will be divided into 4 sections. The sections will be diverse in nature, consisting of MCQs, very short answer type questions, short answer type questions, long answer type questions, etc. You can check the ISC Class 12 Biology Weightage 2026 for theory and practical exam here.

Also Read: ISC Class 12 Biology Previous Year Question Paper

ISC Class 12 Biology Weightage 2026 Theory Exam - Unit Wise

A total of 5 units are included in the ISC Class 12 Biology Syllabus 2025-26. The theory paper will be conducted for 70 marks according to the weightage provided below:

ISC Class 12 Biology Weightage 2026 Practical Exam

The practical exam will be conducted for 30 marks in the ISC class 12 Biology. It is compulsory to pass the practical as well as the theory paper to successfully pass the ISC 12th. You can check out the weightage given to the different aspects of the practical exam from the table given below:

ISC Class 12 Biology Question Paper Blueprint 2026

Having complete information about the question paper pattern is the first step towards getting a good score. You can also learn about the question paper pattern by using the ISC Class 12 Biology Sample Paper 2025-26 . Check out the format of the specimen question paper from the pointers given below:

• The theory paper will be held for 70 marks with a 3-hour duration. 15 minutes will be given to read the question paper.
• There are four sections in the paper: A, B, C, and D. Internal choices have been provided in one question each in Sections B, C, and D.
• Section A consists of one question, each carrying one / two marks.
• Section B consists of seven questions, each carrying two marks.
• Section C consists of seven questions, each carrying three marks.
• Section D consists of three questions, each carrying five marks.
• You need to draw diagrams wherever necessary.