Disclaimer: This question bank is for practice and revision purposes. It is curated using leading sources, teacher insights, and previous board trends, but does not guarantee actual board appearance.
As we approach the CBSE Class XII HSC Board Exam 2026, our expert faculty has analyzed emerging board trends and examination patterns to create this comprehensive question bank. This strategic compilation benefits students by providing targeted practice aligned with the latest CBSE guidelines, ensuring thorough preparation for the upcoming biology examination.
Why This Matters
Your performance in the CBSE Class XII Biology examination directly impacts your academic future and career opportunities. Our comprehensive trend analysis reveals that students who practice with expertly curated question banks score significantly higher than those relying solely on textbooks. This collection has undergone rigorous expert review to ensure alignment with current board expectations and emerging examination patterns.
Biology is one of the most fascinating yet challenging subjects in the CBSE Class XII curriculum, requiring a deep understanding of life processes, molecular mechanisms, and ecological relationships. This comprehensive question bank has been designed to help students prepare effectively for their HSC Board Exam 2026, covering all important topics and providing practice questions that mirror the actual exam pattern.
Key Topics Covered
This question bank covers all essential biology topics from the CBSE Class XII syllabus:
- Reproduction in Organisms
- Sexual Reproduction in Flowering Plants
- Human Reproduction
- Reproductive Health
- Principles of Inheritance and Variation
- Molecular Basis of Inheritance
- Evolution
- Human Health and Disease
- Strategies for Enhancement in Food Production
- Microbes in Human Welfare
- Biotechnology: Principles and Processes
- Biotechnology and its Applications
- Organisms and Populations
- Ecosystem
- Biodiversity and Conservation
- Environmental Issues
Question Types and Format
This question bank includes various types of questions designed to test different levels of understanding and application:
- Multiple Choice Questions (MCQs) – Test conceptual understanding and quick recall
- Short Answer Questions – Require brief explanations and process descriptions
- Long Answer Questions – Detailed explanations and comprehensive analysis
- Diagram-based Questions – Labeling and structural identification
- Assertion-Reason Questions – Critical thinking and logical reasoning
- Case Study Questions – Real-world application and analysis
Study Tips and Exam Strategy
To maximize your performance in the CBSE Class XII Biology exam, follow these essential study tips:
- Focus on understanding biological processes rather than memorizing facts
- Practice drawing and labeling diagrams regularly
- Create flowcharts for complex processes like photosynthesis and respiration
- Use mnemonics for remembering classification and taxonomic hierarchies
- Solve previous year question papers to understand exam patterns
- Time yourself while practicing to improve exam speed
- Review and understand your mistakes to avoid repetition
- Connect theoretical concepts with real-life examples
This comprehensive question bank serves as your complete preparation guide for the CBSE Class XII Biology examination. Regular practice with these questions, combined with a thorough understanding of concepts and consistent revision, will significantly boost your confidence and performance in the 2026 HSC Board Exam. Remember, success in biology comes from understanding life processes and their interconnections.
Access our complete question bank with detailed solutions and expert explanations. Unlock premium content to boost your CBSE Class XII Biology preparation.
2026 Board-Ready Biology Important Questions
🧬 COMPREHENSIVE BIOLOGY QUESTION BANK – CBSE CLASS XII 2026
CHAPTER 1: REPRODUCTION IN ORGANISMS
- MCQ: Asexual reproduction occurs through:
a) Binary fission b) Budding c) Spore formation d) All of the above
Answer: d) All of the above - Short Answer: Define vegetative propagation and give two examples.
Answer: Vegetative propagation is a form of asexual reproduction where new plants develop from vegetative parts like roots, stems, or leaves. Examples: potato tubers, strawberry runners. - Long Answer: Compare sexual and asexual reproduction, highlighting their advantages and disadvantages.
CHAPTER 2: SEXUAL REPRODUCTION IN FLOWERING PLANTS
- MCQ: The male gamete in flowering plants is called:
a) Pollen tube b) Sperm c) Anther d) Stamen
Answer: b) Sperm - Diagram-based: Draw and label the structure of a mature pollen grain.
- Long Answer: Describe the process of double fertilization in angiosperms.
CHAPTER 3: HUMAN REPRODUCTION
- MCQ: The hormone responsible for ovulation is:
a) FSH b) LH c) Estrogen d) Progesterone
Answer: b) LH (Luteinizing Hormone) - Short Answer: What is the significance of the acrosome in sperm?
- Long Answer: Explain the menstrual cycle with hormonal regulation.
CHAPTER 4: REPRODUCTIVE HEALTH
- MCQ: Which is not a sexually transmitted infection?
a) AIDS b) Syphilis c) Tuberculosis d) Gonorrhea
Answer: c) Tuberculosis - Short Answer: Explain the ZIFT technique in assisted reproductive technology.
- Case Study: Analyze the impact of family planning methods on population control.
CHAPTER 5: PRINCIPLES OF INHERITANCE AND VARIATION
- MCQ: In Mendel’s dihybrid cross, the F2 phenotypic ratio is:
a) 3:1 b) 9:3:3:1 c) 1:2:1 d) 1:1
Answer: b) 9:3:3:1 - Short Answer: Define codominance with an example.
- Long Answer: Explain the law of independent assortment with suitable examples.
CHAPTER 6: MOLECULAR BASIS OF INHERITANCE
- MCQ: The enzyme that unwinds DNA during replication is:
a) DNA polymerase b) DNA ligase c) Helicase d) Primase
Answer: c) Helicase - Short Answer: What is the central dogma of molecular biology?
- Long Answer: Describe the process of transcription in prokaryotes.
CHAPTER 7: EVOLUTION
- MCQ: The study of fossils is called:
a) Paleontology b) Archaeology c) Anthropology d) Geology
Answer: a) Paleontology - Short Answer: Explain adaptive radiation with Darwin’s finches as an example.
- Long Answer: Discuss the modern synthetic theory of evolution.
CHAPTER 8: HUMAN HEALTH AND DISEASE
- MCQ: Which cells are primarily affected by HIV?
a) RBC b) WBC c) T-helper cells d) Platelets
Answer: c) T-helper cells - Short Answer: What is autoimmunity? Give one example.
- Long Answer: Explain the different types of immunity with examples.
CHAPTER 9: STRATEGIES FOR ENHANCEMENT IN FOOD PRODUCTION
- MCQ: Green Revolution in India was primarily due to:
a) New varieties of crops b) Better irrigation c) Use of fertilizers d) All of the above
Answer: d) All of the above - Short Answer: What is single cell protein? Give examples.
- Long Answer: Discuss the role of plant breeding in crop improvement.
CHAPTER 10: MICROBES IN HUMAN WELFARE
- MCQ: Methane gas is produced by:
a) Methanogens b) Lactobacillus c) Penicillium d) Saccharomyces
Answer: a) Methanogens - Short Answer: How are antibiotics produced? Give one example.
- Long Answer: Explain the role of microbes in sewage treatment.
CHAPTER 11: BIOTECHNOLOGY – PRINCIPLES AND PROCESSES
- MCQ: The enzyme used to cut DNA at specific sites is:
a) DNA ligase b) Restriction endonuclease c) DNA polymerase d) Reverse transcriptase
Answer: b) Restriction endonuclease - Short Answer: What is gene cloning?
- Long Answer: Describe the process of PCR and its applications.
CHAPTER 12: BIOTECHNOLOGY AND ITS APPLICATIONS
- MCQ: Bt cotton contains gene from:
a) Bacillus thuringiensis b) E. coli c) Agrobacterium d) Rhizobium
Answer: a) Bacillus thuringiensis - Short Answer: What is gene therapy? Give one example.
- Long Answer: Discuss the applications of biotechnology in medicine.
CHAPTER 13: ORGANISMS AND POPULATIONS
- MCQ: The maximum number of individuals that can be supported by an environment is called:
a) Natality b) Mortality c) Carrying capacity d) Population density
Answer: c) Carrying capacity - Short Answer: Explain the difference between r-selected and K-selected species.
- Long Answer: Describe the different types of ecological interactions between species.
CHAPTER 14: ECOSYSTEM
- MCQ: The primary source of energy in an ecosystem is:
a) Wind b) Water c) Sunlight d) Soil
Answer: c) Sunlight - Short Answer: What is ecological succession? Name its types.
- Long Answer: Explain energy flow in an ecosystem with the help of a food chain.
CHAPTER 15: BIODIVERSITY AND CONSERVATION
- MCQ: Which is a biodiversity hotspot in India?
a) Thar Desert b) Western Ghats c) Gangetic Plains d) Central Highlands
Answer: b) Western Ghats - Short Answer: What are the major causes of biodiversity loss?
- Long Answer: Discuss in-situ and ex-situ conservation strategies.
CHAPTER 16: ENVIRONMENTAL ISSUES
- MCQ: Ozone depletion is caused by:
a) CO2 b) CFCs c) SO2 d) CH4
Answer: b) CFCs (Chlorofluorocarbons) - Short Answer: What is biological magnification?
- Long Answer: Explain the greenhouse effect and its consequences.
PRACTICE SETS:
SAMPLE PAPER 1 (70 Marks – 3 Hours)
Section A: MCQs (1 mark each) – 16 questions
Section B: Short Answer Questions (2 marks each) – 7 questions
Section C: Short Answer Questions (3 marks each) – 7 questions
Section D: Long Answer Questions (5 marks each) – 3 questions
IMPORTANT DIAGRAMS TO PRACTICE:
- Structure of flower and its parts
- Human male and female reproductive systems
- DNA replication process
- Protein synthesis
- Ecological pyramid
- Nitrogen cycle
- Cell division (meiosis)
- Embryonic development stages
HIGH-YIELD TOPICS FOR 2026:
- Genetics and molecular biology (25%)
- Reproduction and development (20%)
- Ecology and environment (20%)
- Evolution and diversity (15%)
- Biotechnology applications (10%)
- Human health and disease (10%)
💡 EXPERT SOLVING STRATEGIES:
- Read questions twice before answering
- Use flowcharts for process-based questions
- Include relevant diagrams wherever possible
- Start with easier questions to build confidence
- Allocate time: MCQs (30 min), Short answers (90 min), Long answers (75 min), Review (15 min)
This comprehensive question bank contains over 200 carefully selected questions aligned with CBSE guidelines and recent examination trends.
Focus on understanding biological processes, diagrams, and their applications as they carry maximum weightage in the CBSE Class XII Biology examination. Practice drawing neat, labeled diagrams and flowcharts, as they often fetch additional marks. Always write the process steps clearly and use scientific terminology appropriately. Time management is crucial – allocate specific time slots for different question types during your preparation.
Ready to Excel in Biology 2026?
This comprehensive question bank represents months of expert analysis and careful curation to ensure your success in the CBSE Class XII Biology examination. Regular practice with these questions will build your confidence and improve your problem-solving speed.
We’d love to hear about your preparation journey! Share your thoughts in the comments below and let us know which topics you find most challenging. Don’t forget to share this resource with your classmates and help them succeed too.
Best of luck for your 2026 board examinations!
Our question bank maintains the highest standards of academic accuracy and alignment with current CBSE examination patterns. Regular updates incorporate feedback from practicing teachers and recent board exam trends to provide students with the most relevant preparation material.
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