ISC Biology Exam Pattern and Marking Scheme: The ISC Class 12 Biology Exam Pattern 2025 is designed to measure students' understanding of biological concepts, analytical thinking, and application skills. This pattern emphasizes both theory and practical knowledge, and ensures a balanced assessment of recall, comprehension, and higher-level thinking skills. By including a variety of questions, it encourages students to develop a holistic understanding of the subject. This pattern helps in preparing for competitive exams, builds a strong foundation for advanced study, and promotes critical reasoning. Understanding this structure of the exam is essential for effective preparation, time management, and achieving success in the final exam.
Check: ISC Class 12 Syllabus 2024-25
ISC Class 12 Biology Question Paper Design 2024-25
Here is the question paper design for ISC 12th Biology:
| Section | Number of Questions | Marks per Question | Total Marks | Remarks |
| A | 1 | 1 / 2 | 1 / 2 | 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 | - | 50 | Entire paper |
- Reading Time: 15 minutes for reading the question paper, writing is not permitted during this time.
- Paper Format: 11 printed pages, diagrams to be drawn with pencil only.
- Internal Choices: Provided in one question each in Sections B, C, and D.
- Marks Distribution: Marks for each question are indicated in brackets [ ].
Check: ISC Class 12 Biology Specimen Paper 2025
ISC Class 12 Biology Unit-Wise Weightage 2025
Here's an analysis of the provided ISC Class 12 Biology question paper, detailing the unit-wise weightage and the number of questions from each unit:
Unit-Wise Analysis and Weightage
| Unit Name | Number of Questions | Marks | Section-wise Distribution |
| Reproduction | 8 | 12 | A: 4, B: 2, C: 1, D: 1 |
| Genetics and Evolution | 11 | 21 | A: 7, B: 1, C: 2, D: 1 |
| Biology and Human Welfare | 6 | 11 | A: 3, B: 2, C: 0, D: 1 |
| Biotechnology | 8 | 14 | A: 5, B: 1, C: 2, D: 0 |
| Ecology and Environment | 8 | 12 | A: 3, B: 2, C: 1, D: 2 |
| Miscellaneous/Interdisciplinary | 3 | 5 | A: 2, C: 1 |
Total Questions and Marks:
- Questions: 18
- Marks: 70
Distribution Across Sections:
- Section A (20 Marks): Focused on short-answer recall and application-based questions from all units.
- Section B (14 Marks): Primarily understanding and application questions.
- Section C (21 Marks): Involves reasoning, analysis, and diagram-based answers.
- Section D (15 Marks): Elaborate questions requiring diagrams and explanations.
Unit Focus:
- Genetics and Evolution contributes the most (21 marks, 11 questions).
- Biotechnology and Ecology both have significant representation (14 marks and 12 marks respectively).
Skill-Based Question Types:
- Recall: ~50% of the questions, covering direct facts and definitions.
- Understanding and Application: ~35%, involving problem-solving and contextual interpretation.
- Analysis/Evaluation: ~15%, focusing on reasoning and critical thinking.
ISC Class 12 Biology Exam Pattern 2025
The typology of questions is given here in each section of the specimen paper released for ISC 12th Biology 2025. The question count may exceed as it include the questions under choice.
| Section | Question Types | Number of Questions | Marks | Examples/Focus Areas |
| Section A | Recall | 9 | 9 | Biological names, chromosomal numbers, abbreviations, simple definitions. |
| Application | 4 | 4 | Genetic crosses, chromosome numbers in hybrids, PCR cycles, pollination. | |
| Understanding | 2 | 2 | Biodiversity conservation, plant physiology (apomictic seeds, embryo sac ploidy). | |
| Analysis/Evaluate/Create | 3 | 5 | Assertion-reason questions, palindromic sequences, identifying diagrams. | |
| Section B | Recall | 2 | 4 | Pollination agents, factors affecting biodiversity. |
| Understanding | 4 | 8 | Seed types, embryo functions, mosquito larvicide effects, competition outcomes. | |
| Evaluate | 1 | 2 | HIV detection using diagnostic techniques. | |
| Section C | Recall | 3 | 9 | ZIFT, GIFT, diagrams of tRNA/nucleosome, biodiversity conservation types. |
| Application | 3 | 9 | Genetic traits (genotypic ratios), species richness, ecosystem pyramids. | |
| Evaluate | 1 | 3 | DNA fragment analysis in gel electrophoresis, STDs and their effects. | |
| Section D | Understanding | 3 | 15 | Biocontrol agents vs pesticides, energy transfer in pyramids, pedigree analysis of PKU. |
Section A:
- Major focus on Recall and Application questions, which are concise.
- Includes assertion-reason and creative questions, making it a mixed typology section.
Section B:
- Dominated by Understanding questions, requiring explanations and context-based answers.
Section C:
- Balanced between Recall, Application, and Evaluation questions, demanding deeper knowledge and reasoning.
Section D:
- Focused entirely on Understanding, with longer and integrative questions combining theoretical and practical aspects.
- This typology table will help align preparation strategies with each section's specific demands
Conclusion
The ISC Class 12 Biology exam 2025 follows a structured pattern with a total of 70 marks for the theory paper and 30 marks for practicals. The theory paper consists of four sections: Section A (20 marks, short answer questions), Section B (14 marks, moderate-length questions), Section C (21 marks, application-based and descriptive questions), and Section D (15 marks, long answer questions). Internal choices are provided in one question each in Sections B, C, and D. The questions test recall, understanding, application, analysis, and evaluation skills. Diagrams are crucial and must be drawn with a pencil for clarity.
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