Bihar Board 12th Biology Syllabus 2025: Download PDF
Table of Contents
The Bihar Board School Examination (BSEB) curates the Bihar Board 12th Biology syllabus 2025 and can be availed on its official website. Students can access the syllabus and get detailed information on 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 2025.
The Bihar board 12th biology exam 2025 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 2025: Download PDF
The Bihar Board 12th Biology Syllabus 2025 is curated by academic experts and uploaded online at biharboardonline.bihar.gov.in. The PDF link to download the syllabus is below.
| Particular | PDF Link |
| Bihar Board 12th Biology Syllabus | Download Here |
How to Download the Bihar Board 12th Biology Syllabus 2025?
The class 12 biology syllabus can be downloaded from the official website. Students can follow the stepwise process below.
- Candidates must visit the Bihar Board online portal, biharboardonline.bihar.gov.in.
- Then, click on the syllabus header on the homepage.
- A list of syllabus for various subjects will be displayed.
- Students are required to select the BSEB 12th biology syllabus.
- Download the class 12 biology syllabus Bihar Board and refer to it for preparation.
Bihar Board 12th Biology Syllabus 2025: Chapter wise Topics 2025
The Bihar Board 12th biology exams will consist of 50% MCQ and 50% subjective questions. Students must aim to cover the entire syllabus to ensure maximum marks. The chapter-wise unit in the Bihar Board 12th Biology Syllabus 2025 is given below.
Unit 1: Sexual Reproduction
- Pollination and fertilization in flowering plants.
- Development of seed and fruit
- Human Reproduction: Reproductive system in male and females, menstrual cycle, production of gametes. Fertilization, 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 evidences
Unit 3: Biology & human welfare
- Animal Husbandry
- Basic concepts of immunology, vaccines
- Pathogens, parasites
- Plant bleeding, tissue culture, food production
- Microbes in household food processing, industrial production, Sewage treatment and energy generation
- Cancer and AIDS
- Adolescence and drug 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 2025
The BSEB 12th biology paper has two segments: botany and zoology. Candidates can get detailed marks allocation for various units incorporated in class 12 biology syllabus 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 |
Bihar Board 12th Biology Exam Pattern 2025
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 2025
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