Create CBSE Class 12 Biology board-pattern question papers in seconds — fully aligned with the 2025-26 examination format (Code 044). Every paper includes all 5 sections (A to E), 50% competency-based questions, source-based case studies, and step-wise marking schemes with detailed answer keys.
Covers all 5 units — Reproduction, Genetics & Evolution, Biology in Human Welfare, Biotechnology, and Ecology. Trusted by 5,000+ CBSE schools, biology teachers, and coaching institutes across India.
No sign-up required • PDF & DOCX download • Answer key included
The CBSE Class 12 Biology Question Paper Generator by SchoolDeck is a free AI-powered tool that helps teachers, tutors, and students create board-pattern question papers for Biology (Code 044) within minutes — without spending hours manually selecting questions and checking blueprints.
Whether you need a full 70-mark board exam mock paper, a chapter-wise unit test on Genetics, a half-yearly examination covering Reproduction and Genetics, or quick revision worksheets on Biotechnology — this generator produces professionally formatted papers that exactly match the CBSE 2025-26 examination blueprint, including the latest competency-based question format mandated under NEP 2020.
Every generated paper comes with a detailed step-wise marking scheme and answer key, making it ideal for both formal assessment and student self-practice. The tool supports diagram-based questions, pedigree chart problems, experimental data interpretation, and source-based case studies — all the question types that appear in actual CBSE board examinations.
Official 70-Mark Theory Paper Blueprint — Unit-Wise Weightage
| Unit No. | Unit Name | Key Topics / Chapters | Marks |
|---|---|---|---|
| VI | Reproduction | Sexual Reproduction in Flowering Plants, Human Reproduction (Male & Female Reproductive System, Fertilisation, Embryo Development), Reproductive Health (STIs, Contraception, IVF, ART) | 16 |
| VII | Genetics and Evolution | Mendelian Genetics, Chromosomal Disorders, Pedigree Analysis, DNA Structure & Replication, Transcription & Translation, Regulation of Gene Expression, Human Genome Project, DNA Fingerprinting, Evolution Theories | 20 |
| VIII | Biology in Human Welfare | Human Health & Disease (Immunity, AIDS, Cancer, Drugs), Microbes in Human Welfare (Biogas, Sewage Treatment, Antibiotics, Biocontrol) | 12 |
| IX | Biotechnology and its Applications | Principles & Processes of Biotechnology (Recombinant DNA Technology, PCR, Restriction Enzymes, Gel Electrophoresis), Biotechnology Applications (Bt Cotton, Golden Rice, Gene Therapy, Bioreactors) | 12 |
| X | Ecology and Environment | Organisms and Populations (Adaptations, Population Interactions), Ecosystem (Energy Flow, Nutrient Cycles), Biodiversity & Conservation (Hotspots, Threatened Species, In-situ & Ex-situ) | 10 |
| Total Theory Examination | 70 | ||
| Practical / Internal Assessment | 30 | ||
| Grand Total | 100 | ||
Source: CBSE Academic Session 2025-26 Curriculum for Biology (Code 044). Genetics & Evolution carries the highest weightage of 20 marks (approx. 28.5%) in the theory paper.
The SchoolDeck generator precisely follows this 5-section structure in every generated paper
14 MCQs + 2 Assertion-Reasoning questions. Tests conceptual recall across all 5 units — pollination types, Mendelian ratios, DNA replication enzymes, types of immunity, ecological pyramids. No internal choice. All questions are compulsory.
5 questions with internal choice. Covers direct 2–3 line answers — naming hormones in human reproduction, defining key terms (restriction enzymes, gene pool), identifying structures in diagrams, stating the significance of ecological concepts.
7 questions with internal choice. Multi-point answers on pedigree chart analysis, dihybrid crosses, process of recombinant DNA technology, immunity (innate vs. adaptive), sewage treatment stages, and population growth models (logistic vs. exponential).
3 long-form questions with internal choice. Detailed explanations with labelled diagrams — gametogenesis & fertilisation in flowering plants, Central Dogma with regulation of lac operon, energy flow through ecosystem with diagram, applications of biotechnology in medicine and agriculture.
2 passage-based case study questions with 3–4 sub-parts each. Real-world scenarios: clinical genetics case (inheritance of a genetic disorder from a pedigree), an ecological or biotechnology application scenario. Tests analysis, interpretation, and higher-order thinking (HOTS) — central to NEP 2020 competency framework.
| Section | Questions | Marks Each | Total Marks | Internal Choice |
|---|---|---|---|---|
| A — MCQ + AR | 16 | 1 | 16 | No |
| B — VSA | 5 | 2 | 10 | Yes |
| C — SA | 7 | 3 | 21 | Yes |
| D — LA | 3 | 5 | 15 | Yes |
| E — Case Study | 2 | 4 | 8 | Yes (sub-parts) |
| Total | 33 Questions | 70 Marks | ||
4 simple steps — no sign-up needed to get started
Choose CBSE → Class 12 → Biology (044). The tool auto-loads the official 2025-26 syllabus, unit-wise weightage, and the correct paper blueprint.
Select full syllabus for a board exam mock, or pick specific chapters (e.g., Genetics + Biotechnology only for unit tests). Set difficulty as Easy, Medium, Hard, or Mixed.
Select Board Exam Pattern (full 70-mark), Pre-Board Mock, Half Yearly, Quarterly, or Unit Test. The AI auto-applies the correct section structure and marks allocation for each format.
Click Generate. Review the question paper and step-wise marking scheme on screen. Download separately as PDF or DOCX — with or without the answer key included.
Our question bank covers all 13 chapters from NCERT Class 12 Biology (Part I & Part II)
Built specifically for the depth and diversity of CBSE Class 12 Biology assessments
Includes questions requiring labelled diagrams — T.S. of ovary, human male reproductive system, lac operon, Krebs cycle, food web, ecosystem components — with clear marking guidelines for diagram marks.
Generates Mendelian genetics problems (monohybrid, dihybrid, incomplete dominance, codominance), pedigree analysis questions, and chromosomal disorder identification — with full worked solutions.
Automatically balances knowledge-recall, comprehension, application, and analysis questions in the correct ratio per CBSE 2025-26 mandates — ensuring students are board-exam ready.
Every paper respects the official unit-wise marks distribution — 20 for Genetics, 16 for Reproduction, 12 each for Biology in Human Welfare and Biotechnology, 10 for Ecology. Zero manual calculation.
Every solution includes marks-per-point breakdown — e.g., "1 mark for diagram + 2 marks for correct labelling + 1 mark for function" — aligned with official CBSE board evaluation standards.
Passage-based questions on real-world biology — genetic counselling cases, biotechnology applications in insulin production, conservation challenges, infectious disease outbreaks — updated for CBSE 2025-26 format.
Generate multiple unique papers from the same chapter selection. Each paper has different questions with consistent difficulty and blueprint — perfect for Set A/B/C, parallel sections, or weekly practice tests.
Board Exam (70 marks), Pre-Board, Half Yearly, Quarterly, Unit Test, Chapter Test, and Revision Worksheet — all with appropriate question count and section distribution for Biology.
Save 3–4 hours per paper. Generate unit tests for Genetics, half-yearly papers, and full pre-board mocks in minutes with correct blueprinting done automatically.
Create audit-ready, standardized papers across all sections simultaneously. Generate Set A, B, C, and D with different questions but identical blueprint and difficulty.
Practice with unlimited board-pattern mock papers. Use step-wise solutions to understand marking criteria. Ideal for CBSE board preparation and NEET Biology foundation building.
SchoolDeck also helps generate practical exam documentation and viva questions for the 30-mark practical component:
One major experiment from the prescribed list (e.g., study of pollen germination, identification of chromosomal disorders from karyotype)
Identification and comment on 4 biological specimens, models, or slides from the spotting list
Practical file/record (5 marks) and viva voce based on experiments performed during the year (2 marks)
Student investigatory project report (3 marks) and project viva (2 marks) on a biology topic of choice
Starting from the 2024-25 session, CBSE has mandated that approximately 50% of questions in the Class 12 Biology board paper must be competency-based. These questions test a student's ability to apply biological concepts to real-world or novel situations — interpreting data, analyzing experimental results, drawing conclusions, and solving problems — rather than simply reproducing textbook definitions.
Examples of competency-based questions in Class 12 Biology include:
SchoolDeck's AI generator automatically includes the correct ratio of competency-based, application-level, and knowledge-recall questions in every paper, ensuring your students are fully prepared for the actual CBSE board examination format.
Our AI prioritizes these high-weightage, repeatedly tested topics in every board-pattern paper
DNA structure, replication, transcription, translation, lac operon, Human Genome Project, DNA fingerprinting — consistently 6–8 marks in board exams.
Microsporogenesis, megasporogenesis, pollination, double fertilisation, embryo development — frequently tested with diagrams (4–6 marks).
Tools (restriction enzymes, vectors, PCR), steps of rDNA technology, gene cloning, bioreactors — biotechnology's most important chapter for board + NEET.
Mendel's laws, incomplete dominance, co-dominance, multiple alleles, linkage & crossing over, pedigree charts, sex determination, chromosomal disorders.
Innate vs. adaptive immunity, antibody structure, vaccines, AIDS (HIV life cycle), cancer (types, causes, treatment), drugs and alcohol abuse.
Energy flow (10% law), ecological pyramids, nutrient cycles (carbon, phosphorus), biodiversity hotspots, in-situ vs. ex-situ conservation, extinction threats.
Everything you need to know about generating CBSE Class 12 Biology question papers
The CBSE Class 12 Biology (Code 044) theory paper carries 70 marks distributed across 5 units: Reproduction (16 marks), Genetics & Evolution (20 marks — highest weightage), Biology in Human Welfare (12 marks), Biotechnology (12 marks), and Ecology (10 marks). Practical/Internal Assessment carries an additional 30 marks, making the grand total 100.
The paper has 5 sections totaling 33 questions for 70 marks: Section A has 16 MCQs (including 2 Assertion-Reasoning) for 16 marks, Section B has 5 Very Short Answer questions (2 marks each) for 10 marks, Section C has 7 Short Answer questions (3 marks each) for 21 marks, Section D has 3 Long Answer questions (5 marks each) for 15 marks, and Section E has 2 Case/Source-Based questions (4 marks each) for 8 marks. Sections B–E have internal choice options.
Yes. Every board-pattern paper includes 2 Source-Based / Case Study questions in Section E (2 × 4 = 8 marks). These are passage-based questions with 3–4 sub-parts based on real-world biology scenarios — genetic counselling cases, clinical immunity scenarios, biotechnology applications, or ecological data analysis — as per official CBSE 2025-26 guidelines.
At the unit level, Genetics and Evolution (Unit VII) carries 20 marks — the highest in the paper. Within this unit, Molecular Basis of Inheritance (Chapter 5) and Principles of Inheritance & Variation (Chapter 4) are the most heavily tested individual chapters, often accounting for 10–12 marks combined. Calculus of Reproduction (Chapter 1 & 2) follows closely with consistent high-mark questions.
Absolutely. You can select single or multiple chapters from the NCERT Class 12 Biology syllabus. For example, generate a Genetics-only paper (Chapters 4, 5, 6), a Biotechnology unit test (Chapters 9 & 10), or a combined Reproduction + Genetics half-yearly paper. The AI auto-adjusts the section structure and question count based on your selection.
Yes. The generator includes diagram-based questions with clear instructions like "Draw a labelled diagram of..." or "Identify and label the parts shown in the figure." Marking schemes for such questions specify separate marks for the diagram and for labelling — exactly as per CBSE board evaluation standards.
Yes, SchoolDeck offers a free tier that lets teachers and students generate CBSE Class 12 Biology question papers with step-wise answer keys and marking schemes. Premium plans unlock unlimited generation, custom school branding/watermarking, bulk generation for Set A/B/C/D, and priority support for exam committees.
As per CBSE's directive for 2025-26, approximately 50% of the total questions in the Class 12 Biology board paper will be competency-based — testing application, analysis, data interpretation, and higher-order thinking (HOTS). SchoolDeck automatically maintains this 50:50 ratio of competency-based to knowledge-based questions in every generated paper.
The 30-mark practical is distributed as: Experiments — 14 marks (one major experiment from the prescribed list), Spotting — 4 marks (identifying 4 biological specimens/slides), Practical Record & Viva — 7 marks (file: 5 marks, viva: 2 marks), and Project Record & Viva — 5 marks (project report: 3 marks, viva: 2 marks).
Yes. Every generated marking scheme follows CBSE board checking conventions — specifying marks per point, marks for diagrams vs. labels, acceptable alternative answers, and value-based marking. This is especially important for Biology where partial credit for diagrams, sequences, and multi-point answers is standard practice in board evaluation.
Join 5,000+ CBSE schools using SchoolDeck to create board-pattern Biology question papers in minutes — with correct blueprinting, case studies, and step-wise marking schemes built in.
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