CBSE Sample Question Papers Class 12 Biology (For 2025 Exam)

1.     Exam Pattern and Marking Scheme

1. Section A: MCQs + Assertion and Reasoning – 16 questions of 1 marks each
2. Section B: Short Answer Type Questions – I – 5 questions of 2 marks each.
3. Section C: Short Answer Type Questions II – 7 questions of 3 marks each.
4. Section D: Case Based Questions – 2 questions of 4 marks each.
5. Section E: Long Answer Type Questions – 3 questions of 5 marks each.

2.     Description of Questions

1. MCQs and Objective Questions: Test factual knowledge and application skills (e.g., naming processes, identifying stages in diagrams).
2. Short Answer Questions: Focus on concepts, definitions, and short explanations (e.g., Mendel’s law, importance of biodiversity).
3. Diagram-Based Questions: Questions requiring drawing, labeling, or interpreting diagrams (e.g., reproductive systems, DNA structure).
4. Long Answer Questions: Detailed explanations of processes, mechanisms, or case studies (e.g., transcription in DNA, sewage treatment processes).
5. Application-Based Questions: Real-life applications of biological concepts (e.g., uses of biotechnology, impacts of pollution).
6. HOTS (Higher-Order Thinking Skills): Analytical and critical thinking questions, often involving problem-solving or extrapolation (e.g., analyzing genetic disorders, interpreting data from ecological studies).

3.     Recommendations for Preparation

1. Study NCERT Thoroughly: CBSE exams are closely aligned with the NCERT textbook.
2. Practice Diagrams: Be able to draw and label important diagrams accurately.
3. Focus on Key Processes: Understand biological processes and their applications, such as DNA replication, photosynthesis, and human reproduction.
4. Solve Sample Papers: Practice CBSE sample papers and previous years’ papers to understand question patterns and time management.
5. Revise Biotechnology and Ecology Thoroughly: These units carry significant weight and often include application-based questions.
6. Prepare Notes: Create concise notes for quick revision, focusing on definitions, key concepts, and diagrams.