Bihar Board 12th Biology Syllabus | Download PDF
The Bihar Board 12th Biology Syllabus is divided into 5 units — Reproduction, Genetics & Evolution, Biology & Human Welfare, Biotechnology, and Ecology & Environment — carrying a total of 70 marks. Genetics, Biotechnology, and Human Welfare each carry 18 marks, making them the highest-priority units for BSEB Class 12 board exam preparation.
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eSaral › Bihar Board › Class 12 › Biology Syllabus PDF
Bihar Board Class 12 Biology is one of the most scoring subjects in the BSEB Science stream — especially for students targeting NEET. Knowing the exact syllabus before you start studying is the single most important step you can take. Without it, you risk spending equal time on a 6-mark unit and an 18-mark unit.
The Bihar Board (BSEB) Class 12 Biology syllabus is structured into 5 units, totalling 70 marks in theory. The remaining 30 marks come from practicals. This article gives you the complete unit-wise syllabus breakdown, a marks-priority matrix, and a clear study plan so you can walk into the exam with confidence.
Whether you are preparing only for the BSEB boards or also targeting NEET, understanding this syllabus will help you plan smarter, not harder.
| Unit | Weightage |
| Unit 1: Reproduction | 06 |
| Unit 2: Genetics and evolution | 18 |
| Unit 3: Applied Biology & Human Welfare | 18 |
| Unit 4: Biotechnology and its applications | 18 |
| Unit 5: Ecology and Environment | 10 |
| Total | 70 |
Bihar Board Class 12 Biology Chapterwise PDF Download (In English)
| Chapter no. | Chapter name | Download |
|---|---|---|
| Chapter 1 | Reproduction in Organisms | Download PDF |
| Chapter 2 | Sexual Reproduction in Flowering Plants | Download PDF |
| Chapter 3 | Human Reproduction | Download PDF |
| Chapter 4 | Reproductive Health | Download PDF |
| Chapter 5 | Principles of Inheritance and Variation | Download PDF |
| Chapter 6 | Molecular Basis of Inheritance | Download PDF |
| Chapter 7 | Evolution | Download PDF |
| Chapter 8 | Human Health and Disease | Download PDF |
| Chapter 9 | Strategies for Enhancement in Food Production | Download PDF |
| Chapter 10 | Microbes in Human Welfare | Download PDF |
| Chapter 11 | Biotechnology: Principles and Processes | Download PDF |
| Chapter 12 | Biotechnology and Its Applications | Download PDF |
| Chapter 13 | Organisms and Populations | Download PDF |
| Chapter 14 | Ecosystem | Download PDF |
| Chapter 15 | Biodiversity and Conservation | Download PDF |
| Chapter 16 | Environmental Issues | Download PDF |
Bihar Board Class 12 Biology Chapterwise PDF Download (In Hindi)
| Chapter No. | Chapter Name | Download |
|---|---|---|
| Chapter 1 | जीवों में जनन | Download PDF |
| Chapter 2 | पुष्पी पादपों में लैंगिक जनन | Download PDF |
| Chapter 3 | मानव जनन | Download PDF |
| Chapter 4 | जनन स्वास्थ्य | Download PDF |
| Chapter 5 | वंशागति तथा विविधता के सिद्धान्त | Download PDF |
| Chapter 6 | वंशागति के आणविक आधार | Download PDF |
| Chapter 7 | विकास | Download PDF |
| Chapter 8 | मानव स्वास्थ्य तथा रोग | Download PDF |
| Chapter 9 | खाद्य उत्पादन में वृद्धि की कार्यनीति | Download PDF |
| Chapter 10 | मानव कल्याण में सूक्ष्मजीव | Download PDF |
| Chapter 11 | जैव प्रौद्योगिकी — सिद्धान्त व प्रक्रम | Download PDF |
| Chapter 12 | जैव प्रौद्योगिकी एवं उसके उपयोग | Download PDF |
| Chapter 13 | जीव और समष्टियाँ | Download PDF |
| Chapter 14 | पारितंत्र | Download PDF |
| Chapter 15 | जैव विविधता एवं संरक्षण | Download PDF |
| Chapter 16 | पर्यावरण के मुद्दे | Download PDF |
Unit 1: Reproduction
- Sexual Reproduction in Flowering Plants: Pollination and Fertilisation
- Development of the seed and fruit
- Reproduction in Humans: Male and Female Reproductive System, Menstrual cycle, production of gametes.
- Fertilisation, implantation, embryo development, pregnancy, and parturition.
- Reproductive health: birth control, contraception, and STDs.
Unit 2: Genetics and evolution
- Basics of Inheritance: Chromosome Theory
- Deviations from the Mendelism ratio
- Sex determination in Humans.
- Linkage and crossing over
- Blood groups in human beings: Inheritance pattern of haemophilia.
- DNA, replication, transcription, translation
- Gene expression and regulation, DNA Fingerprinting
- Genome and Human Genome Project
- Evolution: Theories and evidences
Unit 3: Biology & Human Welfare
- Microbes in Human Welfare: household food processing, industrial production, Sewage treatment and energy generation
- Cancer and AIDS
- Adolescence and drug and alcohol abuse
- Microbes as Biocontrol Agents Microbes as Biofertilizers
- Animal Husbandry
- Basic concepts of immunology, vaccines,
- Enhancement in Food Production Plant Breeding Tissue Culture: Concept of Cellular Totipotency, Requirements of Tissue Culture (in brief)
- Callus Culture, Suspension Culture
- Single Cell Protein. Biofortification
Unit 4: Biotechnology and its applications
- Biotechnology Process
- Recombinant DNA technology: a molecular diagnostic technique.
- Applications in Health & Medicines
- Applications in Agriculture
- Genetically modified (GM) organisms, Biosafety issues
Unit 5: Ecology and environment
- Organisms and Environment
- Ecosystem
- Ecological pyramids
- Ecological Succession
- Nutrient Cycling
- Ecosystem Services
- Biodiversity and Its Conservation
- Environmental Issues
Download PDF of Biology Syllabus, Bihar Board 12th
This information would be useful for those who are looking for the Biology Class 12th Syllabus of the Bihar Board. Get to know the detailed syllabus of Class 12th for all Subjects and prepare accordingly for the upcoming Exams. Download the eSaral App and get access to interactive learning and Video lectures related to Boards, JEE & NEET Preparation.
For students also targeting NEET alongside Bihar Board exams, eSaral's Biology video lectures — delivered by IIT Bombay faculty — cover both BSEB and NEET syllabuses in one structured course. Thousands of Bihar students have cleared NEET using eSaral's Kota-quality content at a fraction of the cost.
📥 Download the eSaral app to access full Biology video lectures, chapter-wise tests, and previous year BSEB papers — all in one place.
🔖 Bookmark this page and return before your exams for a quick unit-wise revision checklist.
Source: Bihar School Examination Board (BSEB) official syllabus. For the latest updates, always verify at biharboardonline.bihar.gov.in.
Frequently Asked Questions
Find answers to common questions.
Is the Bihar Board Class 12 Biology syllabus the same as NCERT?
Yes, the Bihar Board 12th Biology syllabus is largely aligned with the NCERT Class 12 Biology curriculum. All core topics — Reproduction, Genetics, Biotechnology, Human Welfare, and Ecology — are NCERT-based. Students preparing for BSEB boards can safely use NCERT textbooks as their primary study resource, supplemented with BSEB-specific previous year papers.
Which unit has the most marks in Bihar Board 12th Biology?
Three units — Genetics and Evolution, Biology & Human Welfare, and Biotechnology and Its Applications — each carry 18 marks, making them jointly the highest-weightage sections. Together they account for 54 out of 70 theory marks. Students should dedicate roughly 90% of their preparation time to these three units before revising Ecology and Reproduction.
What is the total marks for the Bihar Board 12th Biology theory exam?
The Bihar Board Class 12 Biology theory paper carries 70 marks. The remaining 30 marks are awarded for practical examinations, making the total out of 100. The theory paper covers all 5 units of the BSEB syllabus. Students should aim for at least 55–60 marks in theory to secure a strong overall grade
Is Bihar Board 12th Biology good preparation for NEET?
Yes, Bihar Board 12th Biology is an excellent base for NEET preparation because the BSEB syllabus closely mirrors the NEET Biology syllabus. All major NEET topics — Genetics, Reproduction, Ecology, Biotechnology, and Human Welfare — are part of the BSEB curriculum. Students should supplement BSEB preparation with NEET-level MCQ practice and NCERT exemplar questions.
Where can I download the Bihar Board 12th Biology Syllabus PDF?
The official Bihar Board (BSEB) Class 12 Biology syllabus PDF is available on the official BSEB website (biharboardonline.bihar.gov.in). You can also download it directly from this page on eSaral, where the complete unit-wise syllabus with marks distribution is provided in a structured, exam-ready format.