Bihar Board is Conducting Class 12/ Intermediate Examinations during February 2026. The Biology (I.Sc) Exam is going to be conducted on 07th February 2026.┬а Schools360 Team has Collected Some Previous Year and Model Papers for the Students to Prepare and Practice at Home. Here are the Download Links of Bihar Board Class 12 Biology Model Papers 2026. We are producing exam Paper patterns, Lesson-wise Syllabus and Model Papers.
Bihar Board BSEB Class 12 / Intermediate Biology Question Paper Blueprint
Main Highlights of the Paper:
- The total duration of the exam is 3 hours 15 minutes.
- The MCQs have 4 options.
- Answers for MCQs will be on OMR Sheet.
| Section | Question type | Total no. of questions | No. of questions to be attempted | Mark per question | Total marks |
| Section A | Multiple Choice Questions (MCQs) | 70 | 35 | 1 | 35 |
| Section B | Short Answer Type Questions | 20 | 10 | 2 | 20 |
| Section C | Long Answer Type Questions | 6 | 3 | 5 | 15 |
| Total | 96 | 48 | 70 |
Bihar Board Class 12 Lesson wise Weightage
| Unit | рдЗрдХрд╛рдИ рдХрд╛ рдирд╛рдо | Weightage |
| Unit 1: Sexual Reproduction | рдЗрдХрд╛рдИ 1: рд▓реИрдВрдЧрд┐рдХ рдЬрдирди | 06 |
| Unit 2: Genetics and evolution | рдЗрдХрд╛рдИ 2: рдЖрдиреБрд╡рдВрд╢рд┐рдХреА рддрдерд╛ рд╡рд┐рдХрд╛рд╕ | 18 |
| Unit 3: Biology & human welfare | рдЗрдХрд╛рдИ 3: рдЬреАрд╡ рд╡рд┐рдЬреНрдЮрд╛рди рдПрд╡рдВ рдорд╛рдирд╡ рдХрд▓реНрдпрд╛рдг | 18 |
| Unit 4: Biotechnology and its applications | рдЗрдХрд╛рдИ 4: рдЬреИрд╡ рдкреНрд░рджреНрдпреЛрдЧрд┐рдХреА рдПрд╡рдВ рдЗрд╕рдХрд╛ рдЙрдкрдпреЛрдЧ | 18 |
| Unit 5: Ecology and environment | рдЗрдХрд╛рдИ 5: рдкрд░рд┐рд╕реНрдерд┐рддрд┐рдХреА рддрдерд╛ рдкрд░реНрдпрд╛рд╡рд░рдг | 10 |
| Total | рдпреЛрдЧ рдЕрдВрдХ | 70 |
BSEB Bihar Board 12th Biology Syllabus 2026
Students who are going to attend the Bihar Board Class 12th Biology Exam Must know About the Syllabus in lesson-wise.
Unit 1: Reproduction
- Sexual Reproduction in Flowering plant: Pollination and fertilization
- Development of seed and fruit
- Reproduction in Humans: Male and Female Reproductive System, Menstrual cycle, production of gametes.
- Fertilization, 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 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: 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
Bihar Board Class 12th Intermediate Previous Year Question Papers Model Papers PDF
| Question Paper Type | Download Link |
| Bihar Board Class 12 Biology Question Paper 2020 pdf | Click Here to Download |
| Bihar Board Class 12 Biology Question Paper 2026 pdf | Click Here to Download |
| Bihar Board Class 12 Biology Model Question Paper pdf | Click Here to Download |
| Bihar Board Class 12 Biology Questions Set-1 pdf | Click Here to Download |
| Bihar Board Class 12 Biology Questions Set-2 pdf | Click Here to Download |
| Bihar Board Class 12 Biology Questions Set-3 pdf | Click Here to Download |
| Bihar Board Class 12 Biology Questions Set-4 pdf | Click Here to Download |
| Bihar Board Class 12 Biology Previous and Model Papers Folder | Click Here to Download |
