ISC Class 12 Biology Exam Pattern 2025-26: Paper Pattern, Marking Scheme, and Topic-wise Weightage
ISC Class 12 Biology Exam Pattern 2026: Get the complete breakdown of ISC Biology Class 12 exam format, marking scheme, and topic-based mark distribution to guide students in preparing for the board exams.
ISC Class 12 Biology Exam Pattern and Marking Scheme 2026: ISC Class 12 Biology Exam Pattern and Marking Scheme 2026 helps students to prepare for the exam. The pattern covers different types of questions such as very short answer questions, short answer questions, long answer questions, and case studies based on real life.
The Biology assessment is rigorously structured for 100 marks, following the standard Science stream split: a high-stakes 70-mark Written Theory Paper and a crucial 30-mark Practical/Project component. The pattern tests your knowledge across five core units (including Genetics, Reproduction, and Ecology) using diverse question types from essential labeling and short reasoning questions to complex long-answer conceptual problems. Understanding the precise unit-wise weightage is key.
| Also Check: ISC Class 12 Syllabus 2025-26: All Subjects |
ISC Class 12 Biology Exam Pattern 2026: Key Highlights
| Particulars | Details |
| Conducting Body | Council for the Indian School Certificate Examinations (CISCE) |
| Exam Name | ISC Class 12 Biology Exam 2025–26 |
| Class | 12 |
| Academic Year | 2025-26 |
| Subject | Biology |
| Total Marks | 100 Marks |
| External Exam Weightage | 70 Marks |
| Internal Assessment Weightage | 30 Marks |
| Exam Duration | 2 Hours |
| Types of Questions | MCQs, Short Answers, and Long Answers (Choice Based) |
| Mode of Exam | Offline (Pen and Paper) |
| Medium of Exam | Hindi, English |
ISC Class 12 Biology Exam Pattern 2025-26
ISC Class 12 Biology Exam Pattern for 2025–26 helps students understand how marks are distributed between external and internal assessments. Knowing the pattern allows students to plan their preparation effectively and score better in exams.
| Subject Name | Percentage Marks - External Exams (%) | Percentage Marks - Internal Exams (%) |
| Biology | 70% | 30% |
ISC Class 12 Unit-wise Weightage of Biology 2025-26
The weightage of different topics in the ISC Class 12 Biology exam, presented in a table format:
| Sl.no | Unit | Weightage |
| 1 | Reproduction | 16 marks |
| 2 | Genetics and evolution | 15 marks |
| 3 | Biology and Human Welfare | 14 marks |
| 4 | Biotechnology and its applications | 10 marks |
| 5 | Ecology and environment | 15 marks |
| Total | 70 marks |
ISC Class 12 Biology Question Format 2025-26
Here's a tabular format showing the types of questions for the ISC Class 12 Biology exam 2026, along with their weightage in percentage:
| Section | Number of Questions | Marks per Question | Total Marks | Remarks |
| A | 20 | 1 | 20 | Short-answer questions |
| B | 7 | 2 | 14 | Internal choice in one question |
| C | 7 | 3 | 21 | Internal choice in one question |
| D | 3 | 5 | 15 | Internal choice in one question |
| Total | 18 | - | 70 | Entire paper |
Apeksha Agarwal is an Education Journalist with over 3.5 years of experience. She covers a wide range of topics, including school board examinations, entrance tests, admissions, results, scholarships, and higher education updates. Over the years, she has closely tracked major examinations such as JEE Main, NEET UG, CUET, and various state-level entrance exams, helping students stay informed throughout their academic journey. Apeksha has a Master's degree in Journalism and Mass Communication and a certificate in Digital Journalism. She is passionate about transforming complex educational developments into clear, accessible, and useful information. Her reporting focuses on providing students, parents, and educators with accurate updates and practical insights on examinations, results, and policy changes. She believes that quality education journalism can make a meaningful difference by helping students make informed decisions about their future.
-1792409534300_t.webp)
![NIOS Hall Ticket 2026 [OUT] LIVE: Download Class 10th, 12th October Theory Admit Card at sdmis.nios.ac.in, Direct link here](https://img.jagranjosh.com/images/2026/October/16102026/NIOS-Hall-Ticket-2026.jpg)
![[OUT] UPSSSC PET Admit Card 2026 LIVE: यूपी पीईटी एडमिट कार्ड जारी, upsssc.gov.in पर Direct Link](https://img.jagranjosh.com/images/2026/October/15102026/UPSSSC-PET-Admit-Card-2026.jpg)
