Bihar Board 12th Biology Model Paper 2025-26
Bihar Board 12th Biology Model Paper 2025-26: Here is a Biology Model Paper with Solutions for students preparing for the Bihar Board (BSEB) Class 12th examination in 2026.
By practicing with this model paper, you can score good marks in the board exam. This model paper is designed according to the latest exam pattern and syllabus of the Bihar Board.
Step-by-step solutions are provided for all questions to make it easier for students to understand. You can download the Bihar Board 12th Biology Model Paper 2025-26 with Solutions in PDF format for free from the links given below.
Bihar Board 12th Biology Model Paper 2025-26: PDF Download Links
Bihar Board 12th Biology Model Paper 2025-26: Exam Pattern (Official)
The official pattern for the Bihar Board 12th Biology exam is as follows:
| विवरण (Details) |
जानकारी (Information) |
| Board |
BSEB (Bihar Board) |
| Class |
12th (Intermediate) |
| Subject |
Biology (जीवविज्ञान) |
| Subject Code |
119 |
| Full Marks |
70 |
| Total Questions |
96 |
| Total Printed Pages |
27 |
| Exam Duration |
3 Hours 15 Minutes |
| Paper Type |
Objective + Subjective |
| Sections |
Section A + Section B |
| Passing Marks |
33% |
| Negative Marking |
No |
Bihar Board 12th Biology Model Paper 2025-26: Question Paper Pattern (Official)
| Section |
Question Type |
Total Questions |
Attempt |
Marks Each |
Total Marks |
| Section A (खण्ड-अ) |
Objective (MCQ) |
70 |
35 |
1 Mark |
35 Marks |
| Section B (खण्ड-ब) |
Short Answer |
20 |
10 |
2 Marks |
20 Marks |
| Section B (खण्ड-ब) |
Long Answer |
6 |
3 |
5 Marks |
15 Marks |
| Total |
- |
96 |
48 |
- |
70 Marks |
Section A: Objective Questions (OMR Based) – Official Pattern
| Details |
Information |
| Question Type |
Objective (MCQ) |
| Total Questions |
70 |
| Questions to Attempt |
35 |
| Marks per Question |
1 Mark |
| Total Marks |
35 Marks |
| Answer Sheet |
OMR Sheet |
| Pen to Use |
Blue/Black Ball Pen |
| Evaluation |
First 35 answers evaluated if more attempted |
Important Instructions for Section A (खण्ड-अ के लिए निर्देश):
- In Section – A there are 70 objective type questions out of which 35 questions are to be answered.
- If the candidates answer more than 35 questions, the first 35 questions only will be evaluated.
- Each question carries 1 mark.
- For answering these darken the circle with blue/black ball pen against the correct option on OMR Answer Sheet provided to you.
- Do not use whitener/liquid/blade/nail etc on the OMR Answer Sheet otherwise the result will be treated invalid.
Section B: Subjective Questions – Official Pattern
| Question Type |
Total Questions |
Attempt |
Marks Each |
Total Marks |
| Short Answer (लघु उत्तरीय) |
20 |
10 |
2 Marks |
20 Marks |
| Long Answer (दीर्घ उत्तरीय) |
6 |
3 |
5 Marks |
15 Marks |
| Total |
26 |
13 |
- |
35 Marks |
Important Instructions for Section B (खण्ड-ब के लिए निर्देश):
- In Section-B there are 20 short answer type questions. Each question carries 2 marks. Out of which any 10 questions are to be answered.
- Apart from these, there are 6 long answer type questions out of which any 3 questions are to be answered. Each question carries 5 marks.
Bihar Board 12th Biology 2025-26: Marks Distribution
| Part |
Marks |
Percentage |
| Objective (Section A) |
35 Marks |
50% |
| Subjective (Section B) |
35 Marks |
50% |
| Total Theory |
70 Marks |
100% |
Complete Marks Distribution:
| Component |
Marks |
| Theory (Written Exam) |
70 Marks |
| Practical |
30 Marks |
| Grand Total |
100 Marks |
Bihar Board 12th Biology 2025-26: Chapter-wise Weightage
Unit-wise Marks Distribution:
| Unit No. |
Unit Name (Hindi/English) |
Expected Weightage |
| Unit 1 |
जनन (Reproduction) |
14 Marks |
| Unit 2 |
आनुवंशिकी तथा विकास (Genetics and Evolution) |
18 Marks |
| Unit 3 |
जीव विज्ञान एवं मानव कल्याण (Biology and Human Welfare) |
14 Marks |
| Unit 4 |
जैव प्रौद्योगिकी एवं उसके अनुप्रयोग (Biotechnology and its Applications) |
10 Marks |
| Unit 5 |
पारिस्थितिकी एवं पर्यावरण (Ecology and Environment) |
14 Marks |
| Total |
- |
70 Marks |
Chapter-wise Weightage:
| Chapter |
Expected Weightage |
| Reproduction in Organisms (जीवों में जनन) |
4-5 Marks |
| Sexual Reproduction in Flowering Plants (पुष्पी पादपों में लैंगिक जनन) |
5-6 Marks |
| Human Reproduction (मानव जनन) |
4-5 Marks |
| Reproductive Health (जनन स्वास्थ्य) |
3-4 Marks |
| Principles of Inheritance and Variation (वंशागति एवं विविधता के सिद्धांत) |
6-7 Marks |
| Molecular Basis of Inheritance (वंशागति का आण्विक आधार) |
6-7 Marks |
| Evolution (विकास) |
4-5 Marks |
| Human Health and Disease (मानव स्वास्थ्य एवं रोग) |
5-6 Marks |
| Strategies for Enhancement in Food Production (खाद्य उत्पादन में वृद्धि की कार्यनीति) |
4-5 Marks |
| Microbes in Human Welfare (मानव कल्याण में सूक्ष्मजीव) |
4-5 Marks |
| Biotechnology: Principles and Processes (जैव प्रौद्योगिकी: सिद्धांत व प्रक्रम) |
4-5 Marks |
| Biotechnology and its Applications (जैव प्रौद्योगिकी एवं उसके उपयोग) |
4-5 Marks |
| Organisms and Populations (जीव और समष्टियाँ) |
4-5 Marks |
| Ecosystem (पारितंत्र) |
4-5 Marks |
| Biodiversity and Conservation (जैव विविधता एवं संरक्षण) |
4-5 Marks |
| Environmental Issues (पर्यावरण के मुद्दे) |
3-4 Marks |
Bihar Board 12th Biology 2025-26: Marking Scheme
| Question Type |
Marks |
Marking Method |
| Objective (MCQ) |
1 Mark |
Correct answer = 1 mark |
| Short Answer (2 Marks) |
2 Marks |
Step-wise marking |
| Long Answer (5 Marks) |
5 Marks |
Step-wise marking with diagrams |
Detailed Marking Criteria:
| Question Type |
Marking Criteria |
| MCQ (1 Mark) |
Full marks for the correct answer. |
| Short Answer (2 Marks) |
Definition - 0.5 points, Explanation - 1 point, Example - 0.5 points |
| Long Answer (5 Marks) |
Definition - 1 point, Diagram - 1.5 points, Explanation - 2 points, Example - 0.5 points |
General Instructions for Candidates
| क्र.सं. |
Instructions (English) |
| 1 |
Candidates must enter his/her Question Booklet Serial No. (10 Digits) in the OMR Answer Sheet. |
| 2 |
Candidates are required to give their answer in their own words as far as practicable. |
| 3 |
Figures in the right-hand margin indicate full marks. |
| 4 |
An extra time of 15 minutes has been allotted to read the questions carefully. |
| 5 |
This question booklet is divided into two sections – Section-A and Section-B. |
| 6 |
Use of any electronic appliances is strictly prohibited. |
Important Tips for Exam Preparation
- Read the NCERT textbook thoroughly - this is the most important thing.
- Practice model papers regularly.
- Solve previous year's questions.
- Practice drawing diagrams - diagrams are crucial in Biology.
- Memorize scientific names and technical terms.
- Practice numerical problems in Genetics.
- Understand flow charts and life cycles.
- Pay attention to time management.
Important Diagrams for Biology Exam
| Chapter |
Important Diagrams |
| Human Reproduction |
Male & Female Reproductive System, Menstrual Cycle |
| Flowering Plants |
T.S. of Anther, Structure of Ovule, Embryo Sac |
| Genetics |
Punnett Square, Pedigree Analysis |
| Molecular Biology |
DNA Replication, Transcription, Translation |
| Biotechnology |
PCR, Gel Electrophoresis, rDNA Technology |
| Ecology |
Food Chain, Food Web, Ecological Pyramids |
Sign in
Profile
Signout
Home
Quiz
Short News
Web Story
Get latest Exam Updates 
