CBSE Class 12 Biology Sample Question Papers with Solutions - FREE PDF Download
CBSE Class 12 Biology Sample Question Papers with Solutions are considered valuable study resources for students preparing for board exams.
Want to know what to expect in your exams? These papers break down the latest patterns, question styles, and marking systems for every subject in the CBSE Class 12 syllabus.
Practicing these sample papers enables students to enhance their confidence, develop effective time management skills and evaluate their readiness for upcoming board exams.
Each question paper includes detailed solutions that guide students step by step, helping them understand concepts better and improve how they write answers.
CBSE Class 12 Exam Pattern 2025-26: Updated Subject-Wise Marking Scheme, Weightage and Key Changes
The Central Board of Secondary Education (CBSE) has released the latest exam pattern and marking scheme for Class 12 students for the 2025–26 academic session. The board exams are tentatively scheduled to begin in February 2026, and with mid-term exams nearly over, this is the ideal time for students to gear up for full-scale preparation.
Staying informed about the updated question paper format, marking weightage, and key structural changes is crucial for effective exam strategy and time management. The 2025–26 pattern emphasizes competency-based learning, in line with the National Education Policy (NEP) 2020, encouraging analytical thinking and practical understanding over rote memorization.
Question Paper Typology Breakdown
|
Component |
Description |
|
Exam Conducting Authority |
Central Board of Secondary Education |
|
Question Paper Pattern |
MCQs: 20% |
|
Competency-based questions (case-based, source-based, or other types): 30% |
|
|
Short/long answer type questions: 50% |
|
|
Total Duration |
3 hours |
|
Mode of Examination |
Offline |
|
Number of Subjects |
5 or 6 (as elected by the student) |
|
Maximum Marks |
100 (Theory+Practical) |
|
80 marks for Maths written exam + 20 marks for internal assessment. |
|
|
70 marks theory + 30 marks practical for Physics, Chemistry & Biology |
|
|
80 marks theory + 20 marks project works for Commerce subjects (Accountancy, Business Studies & Economics) |
|
|
Passing Marks for Each Subject |
33% |
|
Passing Marks for the Overall Exam |
Aggregate 33% |
Increased weightage for Competency-Based Questions
As per recent updates, the new exam pattern introduces more competency-based questions and reduces the number of constructed response questions by 10% compared to the previous year.
|
Particulars |
Type of Questions |
Academic Session 2024-25 (Weightage) |
Academic Session 2025-26 (Weightage) |
|
Composition of question paper for year-end exam/ Board Exams (Theory) |
Competency Focused Questions in the form of MCQs/ Case-Based Questions, Source-based Integrated Questions, or any other type |
40% |
50% |
|
Select response-type questions (MCQ) |
20% |
20% |
|
|
Constructed response questions |
40% |
30% |
CBSE Class 10 Mathematics Exam Pattern, Marking Scheme & Weightage 2025-26
The CBSE Class Exam Pattern 2025-26 features an equitable blend of objective and subjective items, aiming to evaluate both analytical reasoning and problem-solving skills.
|
Category |
Information |
|
Total Score |
100 Marks (divided into 80 for the written exam and 20 for the internal assessment) |
|
Written Paper Structure |
55% Objective Type (MCQs, fill-in-the-blanks, true/false, or very short answer type) |
|
25% Application-Based (Case/Source-based) |
|
|
20% Descriptive (Short & Long Answers) |
|
|
Internal Evaluation |
Periodic tests (best 2 out of 3 will be counted) and subject-based activities in Mathematics, each carrying 10 marks. |
|
Time Duration |
3 Hours for the theory exam |
|
Qualifying Marks |
Minimum 33% required per subject and overall total |
CBSE Class 12 Mathematics 2025-26 - Marking Scheme
|
Sections |
Type of Questions |
Marks |
Weightage |
|
A |
18 MCQs and 2 Assertion-Reason Based Questions |
1 |
20 |
|
B |
5 Very Short Answer Type Questions |
2 |
10 |
|
C |
6 Short Answer Type Questions |
3 |
18 |
|
D |
4 Long Answer Type Questions |
5 |
20 |
|
E |
3 Source-Based/Case-Based Questions/Passage-Based/Integrated units of Assessment |
4 |
12 |
|
Total Marks |
80 |
||
CBSE Class 12 Mathematics 2025-26 - Weightage
|
S.No |
Title |
Marks |
|
Unit-I |
Relations & Functions |
8 |
|
|
Chapter-1: Relations and Functions |
|
|
Chapter-2: Inverse Trigonometric Functions |
||
|
Unit-II |
Algebra |
10 |
|
|
Chapter-3: Matrices |
|
|
Chapter-4: Determinants |
||
|
Unit-III |
Calculus |
35 |
|
|
Chapter-5: Continuity and Differentiability |
|
|
Chapter-6: Application of Derivatives |
||
|
Chapter-7: Integrals |
||
|
Chapter-8: Application of Integrals |
||
|
Chapter-9: Differential Equations |
||
|
Unit-IV |
Vectors & Three-Dimensional Geometry |
14 |
|
|
Chapter-10: Vector Algebra |
|
|
Chapter-11: Three Dimensional Geometry |
||
|
Unit-V |
Linear Programming |
5 |
|
|
Chapter-12: Linear Programming |
|
|
Unit-VI |
Probability |
8 |
|
|
Chapter-13: Probability |
|
|
Total |
80 |
|
|
Internal Assessment |
20 |
|
CBSE Class 10 Physics Exam Pattern, Marking Scheme & Weightage 2025-26
The CBSE Class 12 Physics exam (2025-26) will be a 100-mark paper, split into a 70-mark theory section and a 30-mark practical section. The theory paper will include MCQs, strategic questions, short answers, and long answers.
|
Category |
Information |
|
Marks Distribution |
Theory: 70 marks |
|
Practical/Project Work: 30 marks |
|
|
Type of Questions |
Multiple Choice Questions (38%) |
|
Application-Based Questions (32%) |
|
|
Descriptive – Short & Long Answers (30%) |
|
|
Time Duration |
The total duration of the written paper is 3 hours. |
CBSE Class 12 Physics 2025-26 - Marking Scheme
|
Sections |
Type of Questions |
Marks |
Weightage |
|
A |
16 Questions (MCQs, Very short and Short response) |
1 |
16 |
|
B |
5 Short Answer Type Questions |
2 |
10 |
|
C |
7 Short Answer Type Questions |
3 |
21 |
|
D |
2 Case-Based Questions |
4 |
8 |
|
E |
3 Short Answer Type Questions |
5 |
15 |
|
Theory Total |
- |
- |
70 |
|
Practical Exam |
Activities, Experiments, Viva and Record work |
- |
30 |
|
Grand Total |
Combined Score of Theory and Practical |
- |
100 |
CBSE Class 12 Physics 2025-26 - Weightage
|
S.No |
Title |
Marks |
|
Unit-I |
Electrostatics |
16 |
|
|
Chapter-1: Electric Charges and Fields |
|
|
Chapter-2: Electrostatic Potential and Capacitance |
||
|
Unit-II |
Current Electricity |
|
|
|
Chapter-3: Current Electricity |
|
|
Unit-III |
Magnetic Effects of Current & Magnetism Unit |
17 |
|
|
Chapter-4: Moving Charges and Magnetism |
|
|
Chapter-5: Magnetism and Matter |
||
|
Unit-IV |
Electromagnetic Induction & Alternating Currents |
|
|
|
Chapter-6: Electromagnetic Induction |
|
|
Chapter-7: Alternating Current |
||
|
Unit-V |
Electromagnetic Waves |
18 |
|
|
Chapter-8: Electromagnetic Waves |
|
|
Unit-VI |
Optics |
|
|
|
Chapter-9: Ray Optics and Optical Instruments |
|
|
Chapter-10: Wave Optics |
||
|
Unit-VII |
Dual Nature of Radiation & Matter |
12 |
|
|
Chapter-11: Dual Nature of Radiation & Matter |
|
|
Unit-VIII |
Atoms and Nuclei |
|
|
|
Chapter-12: Atoms |
|
|
Chapter-13: Nuclei |
||
|
Unit-IX |
Electronic Devices |
7 |
|
|
Chapter-14: Semiconductor Electronics: Materials, Devices and Simple Circuits |
|
|
Total Theory Marks |
70 |
|
|
Practical Components |
||
|
Two Experiments (One from each section) |
7+7 |
|
|
Practical file (with activities and experiments recorded) |
5 |
|
|
One hands-on activity from any section |
3 |
|
|
Project work (investigatory type) |
3 |
|
|
Viva, based on experiments and a project |
5 |
|
|
Practical/Project Work |
30 |
|
CBSE Class 10 Chemistry Exam Pattern, Marking Scheme & Weightage 2025-26
The CBSE Class 12 Chemistry exam for 2025-26 will be 70 marks for the written paper and 30 for practical. The theory paper has five sections with varied question types and weightage.
|
Category |
Information |
|
Marks Distribution |
Theory: 70 marks |
|
Practical/Project Work: 30 marks |
|
|
Type of Questions |
Multiple Choice Questions (40%) |
|
Competency-Based Questions (30%) |
|
|
Descriptive – Short & Long Answers (30%) |
|
|
Time Duration |
The total duration of the written paper is 3 hours. |
CBSE Class 12 Chemistry 2025-26 - Marking Scheme
|
Sections |
Type of Questions |
Marks |
Weightage |
|
A |
16 Questions (MCQs, Very short and Short response) |
1 |
16 |
|
B |
5 Very Short Answer Type Questions |
2 |
10 |
|
C |
7 Short Answer Type Questions |
3 |
21 |
|
D |
2 Case-Based Questions |
4 |
8 |
|
E |
3 Short Answer Type Questions |
5 |
15 |
|
Theory Total |
- |
- |
70 |
|
Practical Exam |
Activities, Experiments, Viva and Record work |
- |
30 |
|
Grand Total |
Combined Score of Theory and Practical |
- |
100 |
CBSE Class 12 Chemistry 2025-26 - Weightage
|
S.No |
Title |
Marks |
|
Unit-1 |
Solutions |
7 |
|
Unit-2 |
Electrochemistry |
9 |
|
Unit-3 |
Chemical Kinetics |
7 |
|
Unit-4 |
d -and f- f-block elements |
7 |
|
Unit-5 |
Coordination Compounds |
7 |
|
Unit-6 |
Haloalkanes & Haloarnes |
6 |
|
Unit-7 |
Alcohol, Phenols & Ethers |
6 |
|
Unit-8 |
Aldehydes, Ketones & Carboxylic Acids |
8 |
|
Unit-9 |
Amines |
6 |
|
Unit-10 |
Biomolecules |
7 |
|
Total Theory Marks |
70 |
|
|
Practical Components |
||
|
Volumetric Analysis |
8 |
|
|
Salt Analysis |
8 |
|
|
Content-Based Experiment |
6 |
|
|
Project |
4 |
|
|
Class record & viva |
4 |
|
|
Practical/Project Work |
30 |
|
CBSE Class 10 Biology Exam Pattern, Marking Scheme & Weightage 2025-26
The CBSE Class 12 Biology exam for 2025-26 will be 70 marks for the written paper and 30 for practical. The theory paper has five sections with varied question types and weightage.
|
Category |
Information |
|
Marks Distribution |
Theory: 70 marks |
|
Practical/Project Work: 30 marks |
|
|
Type of Questions |
Multiple Choice Questions (50%) |
|
Competency-Based Questions (30%) |
|
|
Descriptive – Short & Long Answers (20%) |
|
|
Time Duration |
The total duration of the written paper is 3 hours. |
CBSE Class 12 Biology 2025-26 - Marking Scheme
|
Sections |
Type of Questions |
Marks |
Weightage |
|
A |
16 Questions (MCQs, Very short and Short response) |
1 |
16 |
|
B |
5 Short Answer Type Questions |
2 |
10 |
|
C |
7 Short Answer Type Questions |
3 |
21 |
|
D |
2 Case-Based Questions |
4 |
8 |
|
E |
3 Short Answer Type Questions |
5 |
15 |
|
Theory Total |
- |
- |
70 |
|
Practical Exam |
Acitivities, Experiments, Viva and Record work |
- |
30 |
|
Grand Total |
Combined Score of Theory and Practical |
- |
100 |
CBSE Class 12 Biology 2025-26 - Weightage
|
Unit |
Title |
Marks |
|
Unit VI |
Reproduction |
16 |
|
|
Chapter-1: Sexual Reproduction in Flowering Plants |
|
|
Chapter-2: Human Reproduction |
||
|
Chapter-3: Reproductive Health |
||
|
Unit VII |
Genetics and Evolution |
20 |
|
|
Chapter-4: Principles of Inheritance and Variation |
|
|
Chapter-5: Molecular Basis of Inheritance |
||
|
Chapter-6: Evolution |
||
|
Unit VIII |
Biology and Human Welfare |
12 |
|
|
Chapter-7: Human Health and Diseases |
|
|
Chapter-8: Microbes in Human Welfare |
||
|
Unit IX |
Biotechnology |
12 |
|
|
Chapter-9: Biotechnology: Principles and Processes |
|
|
Chapter-10: Biotechnology and its Applications |
||
|
Unit X |
Ecology |
10 |
|
|
Chapter-11: Organisms and Populations |
|
|
Chapter-12: Ecosystem |
||
|
Chapter-13: Biodiversity and Conservation |
||
|
Total Theory Marks |
70 |
|
|
Practical Components |
||
|
1 Major experiment |
5 |
|
|
1 Minor experiment |
4 |
|
|
Slide preparation |
5 |
|
|
Spotting |
7 |
|
|
Practical record & viva |
4 |
|
|
Investigatory Project and its Project Record + Viva |
5 |
|
|
Practical/Project Work |
30 |
|