BSEB Class 12 Biology Latest Syllabus 2025-26: Download Latest and Revised BSEB Class 12th Biology Syllabus PDF
Get your Bihar Board 12th Biology syllabus for 2026! It covers marking, units, and exam pattern. Max marks come from Genetics, Evolution, Bio & Human Welfare, and Biotechnology. The exam has 70 marks theory and 30 practical. Download the PDF to start preparing for MCQs and subjective questions.
Table of Contents
The Bihar Board School Examination (BSEB) curates the Bihar Board 12th Biology syllabus 2026 and can be availed on its official website. Students can access the syllabus and get detailed information on the marking strategy, vital units, and paper complexity. Essential chapters such as Biology and Human Welfare, Biotechnology, Genetics, and Evolution comprise maximum marks and are heavily tested in the Bihar Board 10th Exam 2026.
The Bihar board 12th biology exam 2026 contains 100 marks, of which 70 are for theory, and the remaining 30 are for practical. The questions combine MCQs and subjective questions, and students must prepare for the exams accordingly.
Bihar Board 12th Biology Syllabus 2026: Download PDF
The Bihar Board 12th Biology Syllabus 2026 is curated by academic experts and uploaded online at biharboardonline.bihar.gov.in. The PDF link to download the syllabus of Biology class 12 Bihar Board 2025-26 is below.
| Particular | PDF Link |
| Bihar Board 12th Biology Syllabus | Download Here |
How to Download the Bihar Board 12th Biology Syllabus 2026?
The Bihar Board syllabus class 12 2026 Biology syllabus can be downloaded from the official website. Students can follow the stepwise process below to download the class 12 Bihar Board Biology syllabus 2026.
- Step 1: Visit the Bihar Board online portal at biharboardonline.bihar.gov.in.
- Step 2: Click on the 'Biology Class 12 Syllabus Bihar Board 2026' header on the homepage.
- Step 3: A list of syllabi for various subjects will be displayed.
- Step 4: Select the class 12 Bihar Board 2026 Biology syllabus.
- Step 5: Download the Class 12th Biology syllabus Bihar Board 2026, and refer to it for preparation.
Bihar Board 12th Biology Syllabus 2026: Chapter wise Topics 2026
The Bihar Board 12th biology exams will consist of 50% MCQ and 50% subjective questions. Students must aim to cover the entire Bihar Board Class 12 Biology syllabus 2026 to ensure maximum marks. The chapter-wise unit in the Bihar Board 12th Biology Syllabus 2026 is given below.
Unit 1: Sexual Reproduction
- Pollination and fertilisation in flowering plants.
- Development of the seed and fruit
- Human Reproduction: Reproductive system in males and females, menstrual cycle, production of gametes. Fertilisation, implantation, embryo development, pregnancy and parturition.
- Reproductive health: birth control, contraception and sexually transmitted diseases.
Unit 2: Genetics and evolution
- Mendelian Inheritance
- Chromosome theory of inheritance, Deviations from Mendelism ratio (Incomplete dominance, Codominance, Multiple alleles).
- Sex determination in human beings: XX, XY
- Linkage and crossing over
- Inheritance pattern of haemophilia and blood groups in human beings.
- DNA, replication, transcription, translation
- Gene expression and regulation
- Genome and Human Genome Project
- DNA Fingerprinting
- Evolution: Theories and evidence
Unit 3: Biology & human welfare
- Animal Husbandry
- Basic concepts of immunology, vaccines
- Pathogens, parasites
- Plant bleeding, tissue culture, and food production
- Microbes in household food processing, industrial production, Sewage treatment and energy generation
- Cancer and AIDS
- Adolescence and drug and alcohol abuse
Unit 4: Biotechnology and its applications
- Recombinant DNA technology
- Applications in Health, Agriculture and Industry
- Genetically modified (GM) organisms, Biosafety issues
- Insulin and Bt.cotton
Unit 5: Ecology and environment
- Organisms and Populations
- Ecosystem
- Biodiversity and Its Conservation
- Environmental Issues
Read More: Bihar Board 12th Syllabus 2024-25
Bihar Board 12th Biology Exam Marks Distribution 2026
The BSEB 12th biology paper has two segments: botany and zoology. Candidates can get detailed marks allocation for various units incorporated in the class 12 Biology syllabus Bihar Board 2025-26 below.
| Number of Units | Topics | Marks |
| 1 | Sexual Reproduction | 6 |
| 2 | Genetics and evolution | 18 |
| 3 | Biology & human welfare | 18 |
| 4 | Biotechnology and its applications | 18 |
| 5 | Ecology and environment | 10 |
Also Read: Bihar Board Class 12 English Syllabus 2025-26
Bihar Board 12th Biology Exam Pattern 2026
Candidates can comprehend the types of questions asked and the marks allotted. The BSEB will follow the structure below for the class 12th biology exams 2024-25.
| Questions | Total Marks |
| Objective | 35 |
| Subjective | 35 |
| Practical | 30 |
| Total | 100 |
Read more: Bihar Board 12th Exam Pattern 2026
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