The Class 12 Biology Formula Sheet (2026-27 syllabus) puts every fact, diagram, and definition you need for the 70-mark CBSE theory paper into one chapter-wise quick-recall PDF. Use it for last-week revision and the night-before skim.
Class 12 Biology Formula Sheet PDF Download
Every chapter of the 2026-27 Class 12 Biology syllabus is listed below. Each row links to that chapter's own Formula Sheet PDF.
That is when reading full concepts is too slow and full notes are too long.
- Chapters covered: 13 chapters across 5 CBSE units, identical numbering to the main NCERT textbook
- Format: compact 2-column PDF with orange formula boxes and blue section headers
- Length: 5 to 9 pages per chapter, plus a 14 to 22-page combined all-chapters sheet
- Exam alignment: CBSE Class 12 Biology theory paper (70 marks), NEET, AIIMS, CUET-UG Biology
Subject experts make every formula in this Collegedunia Class 12 Biology Formula Sheet. Each one is mapped to the 2026-27 rationalised NCERT. Each one also carries the physical meaning or biological context a CBSE, NEET, AIIMS, or CUET examiner looks for.
How will Collegedunia's Class 12 Biology Formula Sheet Help You?
The Class 12 Biology Formula Sheet is the recall layer of your revision toolkit. Use it in the final week. It cuts the time from "I need a formula" to "I have the formula" from minutes to seconds.
- Every NCERT formula in one place: every formula, derivation result, and key fact from the 13-chapter Class 12 Biology syllabus, sorted by chapter and unit.
- Plain-meaning notes: every formula carries a one-line note on what the symbols mean and when to use the formula. No bare equations.
- Sorted by chapter: orange formula boxes inside blue chapter headers. Each page reads in 60 seconds.
- NEET, AIIMS, and CUET extras: the few extra formulae that these exams test beyond NCERT sit in a separate box per chapter.
- Constants and conversion tables: a one-page constants index sits at the front of the combined sheet. It helps when a numerical question names a constant.
- Print-friendly two-column layout: the compact format prints to half the page count of the Notes. It works well as a printed last-week revision booklet.
What 15,290 students told us about their Class 12 Biology formula-recall routine
Source: Magnet Brains on YouTube
Class 12 Biology Topic Map (Formula Sheet Coverage)
The 13 chapters group into the CBSE units below. Each chapter's Formula Sheet covers the equations in NCERT order.
| Unit | Chapters | What this unit formulae cover |
|---|---|---|
| VI. Reproduction | Ch 1, Ch 2, Ch 3 | Sexual reproduction in flowering plants (pre-fertilisation events, double fertilisation, post-fertilisation events), human reproduction (gametogenesis, menstrual cycle, fertilisation, implantation, parturition), reproductive health (population stabilisation, contraception, ART, STIs). |
| VII. Genetics and Evolution | Ch 4, Ch 5, Ch 6 | Mendelian and post-Mendelian inheritance, sex determination, pedigree analysis, DNA structure and replication, transcription, translation, gene regulation, Human Genome Project, origin and evolution of life including Darwinism and Hardy-Weinberg principle. |
| VIII. Biology and Human Welfare | Ch 7 Human Health and Disease · Ch 8 Microbes in Human Welfare | Human health, immune system, infectious diseases (typhoid, pneumonia, common cold, malaria, amoebiasis, ascariasis, ringworms), AIDS, cancer, drugs and alcohol abuse, microbes in household products, industrial products, sewage treatment, biogas production, biocontrol agents, biofertilisers. |
| IX. Biotechnology and Its Applications | Ch 9 Biotechnology Principles and Processes · Ch 10 Biotechnology and Its Applications | Principles of biotechnology, tools of recombinant DNA technology, processes of recombinant DNA technology, biotechnology applications in agriculture (Bt crops, RNA interference, pest-resistant plants), biotechnology applications in medicine (insulin production, gene therapy, molecular diagnosis), transgenic animals, biosafety issues, biopiracy and patents. |
| X. Ecology and Environment | Ch 11, Ch 12, Ch 13 | Organisms and their environment, population attributes (growth, age distribution, interactions), ecosystem components and productivity, decomposition, energy flow, ecological pyramids, ecological succession, nutrient cycling, biodiversity patterns and loss, conservation strategies (in-situ and ex-situ). |
NCERT Class 12 Biology Deleted Syllabus 2026-27
NCERT has trimmed the 2026-27 Class 12 Biology syllabus to cut the study load for CBSE Boards and NEET. The topics listed below are officially out of the 2026-27 question paper, so skip them while revising.
| Chapter | Deleted Topics (2026-27) |
|---|---|
| Reproduction in Organisms (formerly Ch 1) | Full chapter removed in the 2026-27 update. Asexual modes and life-cycle patterns are out. |
| Strategies for Enhancement in Food Production (formerly Ch 9) | Full chapter removed. Animal husbandry, plant breeding, and single-cell protein are no longer in scope. |
| Microbes in Human Welfare (Ch 10) | Microbes in industrial production: some sub-parts removed. Sewage treatment is kept. |
| Biodiversity and Conservation (Ch 15) | Ecosystem services value and biodiversity-hotspots details removed. |
| Environmental Issues (formerly Ch 16) | Full chapter removed. Air pollution, water pollution, and greenhouse effect are dropped from board scope. |
| Biotechnology - Principles (Ch 11) | Restriction enzyme types (sub-parts): some details removed. |
| Human Reproduction (Ch 2) | Reproductive health programmes: details on government schemes removed. |
The chapter-wise resources in the All Chapters index above already flag every deleted line inline, so you do not waste revision hours on dropped topics.
FORMULA SHEET · CLASS 12 BIOLOGY
Class 12 Biology - Exam Weightage
Class 12 Biology gives you about 160 marks combined across CBSE Boards and NEET UG. That is the single largest scoring block for NEET aspirants.
Class 12 Biology Weightage Snapshot (CBSE 2026 Theory Paper)
The 70-mark CBSE Class 12 Biology theory paper rewards formula recall on the numerical and derivation questions. Genetics and Evolution leads the table at 20 marks, about 29% of the theory paper.
| Chapter | Topic | CBSE Marks (2026) | NEET 2025 Qs |
|---|---|---|---|
| Ch 5 | Molecular Basis of Inheritance | 8 marks | 3 |
| Ch 4 | Principles of Inheritance and Variation | 7 marks | 2 |
| Ch 2 | Human Reproduction | 6 marks | 2 |
| Ch 1 | Sexual Reproduction in Flowering Plants | 6 marks | 2 |
| Ch 9 | Biotechnology Principles and Processes | 6 marks | 2 |
| Ch 10 | Biotechnology and Its Applications | 6 marks | 2 |
| Ch 7 | Human Health and Disease | 5 marks | 2 |
| Ch 12 | Ecosystem | 5 marks | 1 |
| Ch 6 | Evolution | 4 marks | 2 |
| Ch 3 | Reproductive Health | 4 marks | 1 |
| Ch 11 | Organisms and Populations | 4 marks | 1 |
| Ch 8 | Microbes in Human Welfare | 4 marks | 1 |
| Ch 13 | Biodiversity and Conservation | 5 marks | 1 |
Class 12 Biology CBSE 2026 Paper Pattern Snapshot
The 70-mark CBSE Class 12 Biology theory paper runs 3 hours and has five sections. Knowing the weight of each section is half the revision plan. Once you know which section a chapter feeds, you can pick the right resource. Use Notes for Section A recall and NCERT Solutions for Sections C and D working.
- Section A (16 questions of 1 mark each): MCQs and assertion-reason. Tests definitions, examples, and one-line facts.
- Section B (5 questions of 2 marks each): Very short answer. One-step questions on processes, mechanisms, and named experiments.
- Section C (7 questions of 3 marks each): Short answer. Labelled-diagram questions and process-explanation questions sit here.
- Section D (2 case-study questions of 4 marks each): You apply genetics, ecology, or biotechnology to a passage. Sub-parts test how well you read it.
- Section E (3 questions of 5 marks each): Long answer. Full-system descriptions (reproductive system, photosynthesis pathway, DNA replication) anchor this section.
The 70-mark theory paper plus the 30-mark internal assessment (practical, project, viva) makes the 100-mark scheme. Internal assessment marks rise with a complete lab notebook and viva prep. The theory paper is where chapter-wise NCERT prep actually shows.
Where to Start with Class 12 Biology Formula Sheet
For final-week revision, focus on the formula sheets of the six high-weightage chapters. Together they carry 39 of 70 board marks:
- Chapter 5, Molecular Basis of Inheritance (8 marks): the highest-weightage chapter. Transcription, translation, and DNA replication diagrams appear in most board papers.
- Chapter 4, Principles of Inheritance and Variation (7 marks): Mendel's laws, pedigree analysis, and sex determination come up every year. Punnett-square problems are common 5-mark slots.
- Chapter 9, Biotechnology Principles and Processes (6 marks): restriction enzymes, gel electrophoresis, and PCR are common MCQ and long-answer pairs on NEET and CBSE.
- Chapter 10, Biotechnology and Its Applications (6 marks): Bt cotton, GMOs, and gene therapy carry steady weightage on both NEET and CBSE.
- Chapter 2, Human Reproduction (6 marks): labelled diagrams (female and male reproductive systems, gametogenesis) give high marks per question.
- Chapter 1, Sexual Reproduction in Flowering Plants (6 marks): double fertilisation, microsporogenesis, megasporogenesis, and embryo development steps come up in every paper.
Class 12 Biology Formula Sheet: PDF Formats
- HD print-ready PDF: compact two-column layout, high-resolution text, made for the printed last-week revision booklet.
- Standard download PDF: smaller file size for phone reading.
- Hindi-medium Formula Sheet: chapter-wise Hindi versions using NCERT's own words (Jaiv Vigyan). Terms like वंशागति (inheritance) and पारिस्थितिकी तंत्र (ecosystem) stay exactly as NCERT writes them.
- Combined all-chapters sheet: one file of about 14 to 22 pages, with every chapter back to back.
- Constants quick reference: the front page of the combined sheet lists the constants and conversion factors that come up across chapters.
How Class 12 Biology Formula Sheet Pairs with the Other Resources
The Formula Sheet is the recall layer. Pair it with the Notes (concept layer) and the NCERT Solutions (practice layer) for a complete revision routine.
- Class 12 Biology Notes: open this when you need the why behind a formula. The Formula Sheet carries only the formula itself.
- Class 12 Biology NCERT Solutions: keep the Formula Sheet open while you do the back-exercise, so constants and unit conversions are one glance away.
- Class 12 Biology Exemplar Solutions: the harder problem set. The Formula Sheet covers every formula those problems use.
- Class 12 Biology Handwritten Notes: notebook-style revision. It pairs well with the Formula Sheet for the final week.
- Class 12 Biology NCERT Book PDF: the original textbook, for checking how a formula is derived.
- Class 12 Biology Exemplar Book PDF: the source of the harder problems the Formula Sheet supports.
How to Use the Class 12 Biology Formula Sheet Most Effectively
The Formula Sheet is a recall tool, not a teaching tool. Use it in the second half of your revision.
5-STEP METHOD · CBSE TOPPER ROUTINE
How to Use the Formula Sheet - Class 12 Biology
- 1Read the chapter first. Open the NCERT Book PDF or chapter Notes. The Formula Sheet assumes you already know the concepts.
- 2Attempt each question on your own. Write the working in a notebook before you open the answer. Just reading does not build exam speed.
- 3Compare your working to the answer. Mark every step where your approach differed. Those are the spots that lose marks on the board paper.
- 4Flag questions taking over 7 minutes. Put these on the re-attempt list for the final-week revision.
- 5Recite the formula list daily for the last 7 days. Five minutes a day in the final week beats one long cram session. Spaced recall is what survives exam-hall nerves.
- 2 weeks before the boards: print the combined Formula Sheet and bind it as a revision booklet. Add your own notes next to the formulae you tend to forget.
- 1 week before the boards: read one chapter's formula sheet each evening. Start with the high-weightage shortlist.
- Night before the boards: skim the constants page and the formulae for the six high-weightage chapters above. In the final 60 minutes, the Formula Sheet is the best use of your time.
Common Mistakes Class 12 Biology Students Make When Using Formula Sheets
- Confusing autosomal dominant vs autosomal recessive inheritance patterns: Chapter 4 students often misread a pedigree. The autosomal recessive pattern skips generations. The autosomal dominant pattern appears in every generation. Always tag the parents' phenotype before you predict the children's.
- Mixing up transcription and translation directions: Chapter 5 students reverse the 5' to 3' direction in the transcription step. mRNA is made 5' to 3', using the template strand read 3' to 5'.
- Treating menstrual cycle phases as fixed dates: Chapter 2 questions ask for the hormone change at a phase, not a date. Ovulation sets off an LH surge around day 14 of a 28-day cycle. But the question asks which hormone peaks, not which calendar day.
- Forgetting that Hardy-Weinberg needs five conditions: Chapter 6 students often list only no mutation and random mating. The full set adds no migration, no genetic drift, no selection, and a large population. CBSE cuts marks for an incomplete list.
- Writing 'evolution' when the question asks for 'speciation': Chapter 6 uses both terms. Evolution is the change in allele frequencies over time. Speciation is the making of new species. Read the verb carefully before you answer.
- Ignoring the difference between in-situ and ex-situ conservation: Chapter 13 students often call a zoo in-situ. Zoos and seed banks are ex-situ. Biosphere reserves and national parks are in-situ. The CBSE marking scheme cuts marks for the mismatch.
- Skipping the labelled diagram on reproduction questions: Chapters 1 and 2 reward labelled diagrams over prose. A full labelled diagram of the human female reproductive system, or a typical anatropous ovule, is the 3-mark backbone of those questions.
Student Feedback: What 15,290 Class 12 Biology Students Told Us
What 15,290 students told us about their Class 12 Biology formula-recall routine
- 68% of students rated Chapter 5 Molecular Basis of Inheritance the hardest chapter. Next came Chapter 4 Principles of Inheritance and Variation at 57% and Chapter 9 Biotechnology Principles and Processes at 51%.
- Most-skipped chapter: Chapter 13 Biodiversity and Conservation. About 28% of students skipped it, even though it carries 5 marks. Toppers called it easy marks, because the in-situ vs ex-situ table takes under an hour to learn.
- Toppers said that working the Expert's Solution tab on every Chapter 5 Molecular Basis of Inheritance problem added 4-6 marks to their 70-mark theory score. Most of it came from the transcription-translation label answers.
- The average Class 12 Biology student spent 46 hours to finish the NCERT back-exercise once across the 13 chapters. Chapters 4, 5, 9, and 10 took the most time per question.
Also Check: Related Class 12 Biology Resources
- Also Check: CBSE Class 12 Biology chapter notes hub on Collegedunia Exams
- Also Check: CBSE Class 12 exam pattern, dates, and full-subject hub
- Also Check: CBSE Class 12 Syllabus 2026-27
- Also Check: NEET 2026 exam information
- Also Check: NEET 2026 Syllabus
- Also Check: AIIMS MBBS 2026 information
- Also Check: CUET-UG 2026 information
Topper-tested takeaways for Class 12 Biology Formula Sheet
- The Genetics and Evolution formulae deserve a separate one-page pull-out. Print the chapter's Formula Sheet at A5 size and tape it inside your notebook.
- On exam day, the morning skim covers only constants and the high-weightage chapters. Never try to learn a new formula in the last 30 minutes.
- Check every Formula Sheet entry against the NCERT Book PDF at least once. Seeing how it is derived locks the formula in.
- Keep the Formula Sheet open while you do the NCERT back-exercise, so unit conversions are one glance away.
Class 12 Biology Formula Sheet FAQs
Ques. Where can I download the Class 12 Biology Formula Sheet PDF?
Ans. You can download every chapter-wise Class 12 Biology Formula Sheet PDF from the index above. It runs from Chapter 1 Sexual Reproduction in Flowering Plants to Chapter 13 Biodiversity and Conservation. A combined all-chapters PDF is linked too. Both Normal and HD versions are free.
Ques. Is this Class 12 Biology Formula Sheet aligned with the 2026-27 NCERT?
Ans. Yes. Every chapter follows the current 2026-27 syllabus. Where NCERT cut content from the older edition, those sections carry an inline note about the change, so you do not revise dropped material.
Ques. How many chapters are there in Class 12 Biology per the 2026-27 NCERT?
Ans. Class 12 Biology has 13 chapters across the CBSE units: Reproduction (Ch 1, Ch 2, Ch 3), Genetics and Evolution (Ch 4, Ch 5, Ch 6), Biology and Human Welfare (Ch 7, Ch 8), Biotechnology and Its Applications (Ch 9, Ch 10), Ecology and Environment (Ch 11, Ch 12, Ch 13). The Topic Map table above lists every chapter under its unit.
Ques. Which Class 12 Biology chapter has the highest CBSE board weightage?
Ans. Genetics and Evolution is the heaviest unit at 20 marks. The Weightage Snapshot table above shows each chapter's mark share, so you can plan your revision time around the high-scoring chapters.
Ques. How are these Class 12 Biology Formula Sheet different from the other Class 12 Biology resources?
Ans. The Class 12 Biology Formula Sheet works best with the Notes (concept layer) and the NCERT Solutions (back-exercise). Each Collegedunia resource covers the same chapter list in a different format. Together they make a complete revision toolkit.
Ques. Are these Class 12 Biology Formula Sheet files available in Hindi medium?
Ans. Yes. Every chapter comes with a Hindi-medium download next to the English version. The Hindi files use NCERT's own technical words (Jaiv Vigyan), so Hindi-medium students see the same terms they have studied.
Ques. What does Class 12 Biology cover?
Ans. Class 12 Biology covers 5 CBSE units across 13 chapters: Reproduction (Ch 1, Ch 2, Ch 3), Genetics and Evolution (Ch 4, Ch 5, Ch 6), Biology and Human Welfare (Ch 7, Ch 8), Biotechnology and Its Applications (Ch 9, Ch 10), and Ecology and Environment (Ch 11, Ch 12, Ch 13). The 70-mark theory paper and the 30-mark internal assessment together make 100 marks.
Ques. Which is the most-scoring chapter in Class 12 Biology?
Ans. The Genetics and Evolution chapters carry the largest share of the 70-mark paper. The six-chapter shortlist in the Where to Start section above gives you 39 of 70 board marks.
Ques. How should I structure my Class 12 Biology preparation?
Ans. Build chapter by chapter, and do the high-weightage units first. Use the Notes for concepts, the NCERT Solutions for the back-exercise, the Exemplar for harder practice, and the Formula Sheet for the last week. The Study Plan section above lays out the 1-month, 2-week, and 1-week countdown that most toppers use.
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