The Class 12 Biology Formula Sheet (2026-27 syllabus) consolidates every facts, diagrams and definitions you need for the 70-mark CBSE theory paper into a chapter-wise quick-recall PDF. The format is built for the last-week revision pass and the night-before-the-paper skim, when concept reading is too slow and full notes 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
Every formula in this Collegedunia Class 12 Biology Formula Sheet is curated by subject experts, mapped to the 2026-27 rationalised NCERT, and tagged with the physical meaning or biological context a CBSE / NEET / AIIMS / CUET examiner looks for.
Class 12 Biology Formula Sheet: All Chapters
Every chapter of the 2026-27 Class 12 Biology syllabus, with the chapter-specific Formula Sheet PDF linked on each row.
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. Used in the final week, it shortens 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, organised by chapter and unit.
- Physical-meaning glosses: every formula carries a one-line gloss on what the symbols mean and when to apply the formula - no naked equations.
- Sectioned by chapter: orange formula boxes inside blue chapter headers; the visual hierarchy reads in 60 seconds per page.
- NEET / AIIMS / CUET extensions: the few extra formulae that competitive exams test (beyond NCERT) are flagged in a separate box per chapter.
- Constants and conversion tables: a one-page constants index at the front of the combined sheet, useful when a numerical question references a constant by name.
- Print-friendly two-column layout: the compact format prints to half the page count of the Notes; useful for the 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)
How the 13 chapters group into the CBSE units below. Each chapter's Formula Sheet covers the equations listed 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
The NCERT 2026-27 syllabus for Class 12 Biology has been rationalised by the examination authority to reduce content load for CBSE Boards and NEET. The drops listed below are officially out of the 2026-27 question paper, so skip these while revising.
| Chapter | Deleted Topics (2026-27) |
|---|---|
| Reproduction in Organisms (formerly Ch 1) | Full chapter removed in the 2026-27 rationalisation - 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 no longer in scope. |
| Microbes in Human Welfare (Ch 10) | Microbes in industrial production - some sub-parts removed; sewage treatment retained. |
| Biodiversity and Conservation (Ch 15) | Ecosystem services valuation and hotspots-of-biodiversity details removed. |
| Environmental Issues (formerly Ch 16) | Full chapter removed - air pollution, water pollution, greenhouse effect 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 linked in the All Chapters index above already flag every deleted line inline so you don't waste revision hours on dropped topics.
FORMULA SHEET · CLASS 12 BIOLOGY
Class 12 Biology - Exam Weightage
Class 12 Biology contributes roughly 160 marks combined across CBSE Boards and NEET UG, the single largest scoring block for medical-entrance 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 questions and on the derivation slots. Genetics and Evolution leads the table at 20 marks, roughly 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 is split into five sections. Knowing the section-by-section weight is half the revision plan; once you know which section a chapter feeds, you can pick the right resource (Notes for Section A recall, 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; diagram-with-labels questions and process-explanation questions sit here.
- Section D (2 case-study questions of 4 marks each): Application of genetics, ecology, or biotechnology to a passage; sub-parts test interpretation.
- 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 combined with the 30-mark internal assessment (practical, project, viva) makes the 100-mark scheme. Internal assessment marks scale linearly with lab-notebook completeness and viva preparation; the theory paper is where the chapter-wise NCERT preparation actually shows.
Where to Start in the Class 12 Biology Formula Sheet Index
For final-week revision, prioritise the formula sheets of the six high-weightage chapters; together they account for 39 of 70 board marks:
- Chapter 5, Molecular Basis of Inheritance (8 marks): the single highest-weightage chapter. Transcription, translation, and DNA replication diagrams are board-paper staples.
- Chapter 4, Principles of Inheritance and Variation (7 marks): Mendel's laws, pedigree analysis, and sex determination repeat year on year. Punnett-square problems are routine 5-mark slots.
- Chapter 9, Biotechnology Principles and Processes (6 marks): restriction enzymes, gel electrophoresis, and PCR are routine MCQ + LA combinations on NEET and CBSE.
- Chapter 10, Biotechnology and Its Applications (6 marks): Bt cotton, GMOs, and gene therapy carry consistent weightage on both NEET and CBSE.
- Chapter 2, Human Reproduction (6 marks): labelled diagrams (female and male reproductive systems, gametogenesis) deliver high marks per question.
- Chapter 1, Sexual Reproduction in Flowering Plants (6 marks): double fertilisation, microsporogenesis, megasporogenesis, and embryo development steps recur in every paper.
Class 12 Biology Formula Sheet: PDF Formats
- HD print-ready PDF: two-column compact layout, high-resolution typesetting, optimised for the printed last-week revision booklet.
- Standard download PDF: smaller file size for phone reading.
- Hindi-medium Formula Sheet: chapter-wise Hindi translations using NCERT's own vocabulary (Jaiv Vigyan); terms like वंशागति (inheritance) and पारिस्थितिकी तंत्र (ecosystem) are preserved as NCERT writes them.
- Combined all-chapters sheet: one ~14 to 22-page file with every chapter back to back.
- Constants quick reference: the front page of the combined sheet lists the constants and conversion factors that recur 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 (application layer) for a complete revision routine.
- Class 12 Biology Notes: open this when you need the why behind a formula; the Formula Sheet only carries the formula itself.
- Class 12 Biology NCERT Solutions: keep the Formula Sheet open while attempting the back-exercise so unit conversions and constants 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; pairs naturally with the Formula Sheet for the final week.
- Class 12 Biology NCERT Book PDF: the original textbook for cross-checking a formula's derivation.
- Class 12 Biology Exemplar Book PDF: the source for 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 cycle.
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 resource assumes you understand the concepts already.
- 2Attempt each question on your own. Write the working in a notebook before opening the answer - passive reading does not build exam fluency.
- 3Compare your working to the resource. Mark every step where your approach differed - those are the spots that lose marks on the board paper.
- 4Flag questions taking over 7 minutes. These go on the re-attempt list for the final-week revision pass.
- 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 jitters.
- 2 weeks before the boards: print the combined Formula Sheet and bind it as a revision booklet. Add personal annotations against the formulae you tend to forget.
- 1 week before the boards: read one chapter's formula sheet per evening, focusing on the high-weightage shortlist first.
- Night before the boards: skim the constants page and the formulae for the six high-weightage chapters above. The Formula Sheet is the highest-ROI pre-exam read in the final 60 minutes.
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; autosomal dominant appears in every generation. Always tag the parents' phenotype before predicting the children's.
- Mixing up transcription and translation directions: Chapter 5 students reverse the 5' to 3' direction during the transcription step. mRNA is synthesised 5' to 3' using the template strand read 3' to 5'.
- Treating menstrual cycle phases as fixed dates: Chapter 2 questions ask for the hormonal change at a phase, not a date. Ovulation triggers a LH surge around day 14 of a 28-day cycle, but the question is about which hormone peaks, not which calendar day.
- Forgetting that Hardy-Weinberg requires five conditions: Chapter 6 students often list only no mutation and random mating. The full set includes no migration, no genetic drift, no selection, and large population size. CBSE deducts 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 formation of new species. Read the verb carefully before answering.
- Ignoring the difference between in-situ and ex-situ conservation: Chapter 13 students often list a zoo as in-situ. Zoos and seed banks are ex-situ; biosphere reserves and national parks are in-situ. The CBSE marking scheme penalises the mismatch.
- Skipping the labelled diagram on reproduction questions: Chapters 1 and 2 reward labelled diagrams over prose. A complete labelled diagram of the human female reproductive system or a typical anatropous ovule is the 3-mark backbone of those questions.
Student Pulse: 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 as the highest-effort chapter, ahead of 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 (skipped by ~28% of students despite carrying 5 marks). Toppers flagged this as a high-ROI reclaim because the in-situ vs ex-situ table is memorisable in under an hour.
- Toppers reported 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 paper score, mostly from the transcription-translation diagram-and-label answers.
- The average Class 12 Biology student spent 46 hours across the 13 chapters to finish the NCERT back-exercise once, with Chapters 4, 5, 9, 10 eating 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.
- Cross-check every Formula Sheet entry against the NCERT Book PDF derivation at least once; understanding the derivation locks the formula in.
- Keep the Formula Sheet open while attempting 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. Every chapter-wise Class 12 Biology Formula Sheet PDF is downloadable directly from the index above, from Chapter 1 Sexual Reproduction in Flowering Plants through Chapter 13 Biodiversity and Conservation. A combined all-chapters PDF is also linked. Both Normal and HD resolutions are free.
Ques. Is this Class 12 Biology Formula Sheet aligned with the 2026-27 NCERT?
Ans. Yes. Every chapter reflects the current 2026-27 syllabus. Where NCERT rationalised content out of the older edition, the affected sections carry an inline callout flagging the change so you do not over-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 tracks each chapter's mark share so you can plan your revision time around the high-yield 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 is best paired with the concept layer (Notes) and the back-exercise (NCERT Solutions). Each resource on Collegedunia covers the same chapter list but 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 ships with a Hindi-medium download alongside the English version. The Hindi files follow NCERT's own technical vocabulary (Jaiv Vigyan) so that students preparing in Hindi medium find the same terminology they have studied in.
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), Ecology and Environment (Ch 11, Ch 12, Ch 13). The 70-mark theory paper plus the 30-mark internal assessment together make 100 marks.
Ques. Which is the most-scoring chapter in Class 12 Biology?
Ans. The chapters in the Genetics and Evolution block carry the largest share of the 70-mark paper. The six-chapter shortlist in the Where to Start section above together delivers 39 of 70 board marks.
Ques. How should I structure my Class 12 Biology preparation?
Ans. Build chapter by chapter, prioritising the high-weightage units. Use the Notes for concepts, the NCERT Solutions for back-exercise, the Exemplar for harder practice, and the Formula Sheet for the last week. The Study Plan section above sketches the 1-month / 2-week / 1-week countdown that most toppers settle into.
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