Central Board of Secondary Education (CBSE), this year made some important changes in the examination pattern of class 12. Class 12 Biology Important Question with Answer 2025-2026 .From introducing internal assessment in all subjects to changing the format of question paper for board exams, students must be aware of every minute detail of the changed examination pattern. As per the new exam pattern, CBSE has given more weight to the school-based/internal assessment. Major change will be observed in the questions paper format in the board exam 2023-2024. Question papers will have more number of objective type questions.
CBSE changed the examination pattern with an aim to
- discourage students from rote learning
- develop analytical skills and reasoning abilities among students
- produce better results and improve the academic quality of institutions
Marking Scheme for Class 12 CBSE 2025
The exam pattern and marking scheme of CBSE 12th of some of the subjects is given in the following tables:
| Subjects | Theory Exam | Practical Exam |
|---|---|---|
| English | 80 | 20 |
| Sociology | 80 | 20 |
| Political Science | 80 | 20 |
| Physics | 70 | 30 |
| Mathematics | 80 | 20 |
| History | 80 | 20 |
| Geography | 70 | 30 |
| Economics | 80 | 20 |
| Computer Science | 70 | 30 |
| Chemistry | 70 | 30 |
| Business Studies | 80 | 20 |
| Accountancy | 80 | 20 |
| Biology | 70 | 30 |
| CBSE Class 12 Syllabus 2024-25 PDF | |
| CBSE Class 12 English Literature Syllabus 2024 | Click here |
| CBSE Class 12 English Elective Syllabus 2024 | Click here |
| CBSE Class 12 Hindi Elective Syllabus 2024 | Click here |
| CBSE Class 12 Hindi Core Syllabus 2024 | Click here |
| CBSE Class 12 Home Science Syllabus 2024 | Click here |
| CBSE Class 12 Biology Syllabus 2024 | Click here |
| CBSE Class 12 Business Studies Syllabus 2024 | Click here |
| CBSE Class 12 Biotechnology Syllabus 2024 | Click here |
| CBSE Class 12 Chemistry Syllabus 2024 | Click here |
| CBSE Class 12 Computer Science Syllabus 2024 | Click here |
| CBSE Class 12 Geography Syllabus 2024 | Click here |
| CBSE Class 12 History Syllabus 2024 | Click here |
| CBSE Class 12 Physics Syllabus 2024 | Click here |
| CBSE Class 12 Mathematics Syllabus 2024 | Click here |
| CBSE Class 12 Political Science Syllabus 2024 | Click here |
| CBSE Class 12 Applied Mathematics Syllabus 2024 | Click here |
| CBSE Class 12 Psychology Syllabus 2024 | Click here |
| CBSE Class 12 Accountancy Syllabus 2024 | Click here |
The pattern of board exams has changed from this year onwards, so I have mentioned here most important questions for class 12 biology , which I guess is more than sufficient to score 80%+ by just doing these questions.
1. There are a total of 27 questions and five sections in the question paper. All questions are compulsory.
2. Section A contains question numbers 1 to 5, multiple choice questions of one mark each.
3. Section B contains question numbers 6 to 12, short answer type I questions of two marks each.
4. Section C contains question numbers 13 to 21, short answer type II questions of three marks each.
5. Section D contains question number 22 to 24, case-based short answer type questions of three marks each.
6. Section E contains question numbers 25 to 27, long answer type questions of five marks each.
7. There is no overall choice in the question paper. However, internal choices are provided in two questions of one mark, one question of two marks, two questions of three marks and all three questions of five marks. An examinee is to attempt any one of the questions out of the two given in the question paper with the same question number.
Marking scheme for CBSE Class 12th Biology
| Unit | Title | Weightage |
|---|---|---|
| 1 | Reproduction | 14 |
| 2 | Genetics and Evolution | 18 |
| 3 | Biology and Human Welfare | 14 |
| 4 | Biotechnology and Its Applications | 10 |
| 5 | Ecology and Environment | 14 |
| Total Marks | 70 |
Find the CBSE Class 12 Biology course structure 2024 in the table attached below. On the basis of the course structure provided here, the syllabus and topics are covered in the board exams. Also, check unit-wise marks distribution for better preparation of the exam. Students should focus on the unit with more marks weightage and give the least importance to the unit with the lowest marks weightage. However, for a perfect score students should ensure the coverage of full syllabus in detail.
| Unit | Title | Chapters | Marks |
| VI | Reproduction | Chapter 2: Sexual Reproduction in Flowering Plants Chapter 3: Human Reproduction Chapter 4: Reproductive Health | 16 |
| VII | Genetics and Evolution | Chapter 5: Principles of Inheritance and Variation Chapter 6: Molecular Basis of Inheritance | 20 |
| VIII | Biology and Human Welfare | Chapter 8: Human Health and Diseases Chapter 10: Microbes in Human Welfare Microbes in food processing, industrial production, sewage treatment, energy generation and microbes as bio-control agents and bio-fertilizers. Antibiotics; production and judicious use. | 12 |
| IX | Biotechnology and its application | Chapter 11: Biotechnology – Principles and Processes Chapter 12: Biotechnology and its Applications | 12 |
| X | Ecology and Environment | Chapter 13: Organisms and Populations Chapter 14: Ecosystem Chapter 15: Biodiversity and its Conservation | 10 |
CBSE Class 12 Biology Question Paper Pattern 2023
The Biology paper will be of 70 Marks and 3 hours of time duration. Students can have a look at the paper pattern below.
| Section | No. of Questions | Marks per Question |
| A | 14 | 1 Mark Each |
| 2 | Case Based Questions | |
| B | 9 | 2 Marks Each |
| C | 5 | 3 Marks Each |
| D | 3 | 5 Marks Each |
CBSE Class 12 Biology Assessment Areas (Theory Paper)
The type of questions based on which the assessment will be done are mentioned below. Also, an internal choice of approximately 33% would be provided to the students in the exam.
- Very Small Answer Question including MCQs
- Assertion – Reasoning type questions
- Small Answer Question
- Large Answer Question-I
- Large Answer Question-II
- Source-based/ Case-based/ Passage-based/ Integrated assessment questions
| Competencies | |
| Demonstrate Knowledge and Understanding | 50% |
| Application of Knowledge / Concepts | 30% |
| Analyse, Evaluate and Create | 20% |
CBSE Class 12 Biology Practical Evaluation Scheme
| Evaluation Scheme | Marks |
| One Major Experiment | 5 |
| One Minor Experiment | 4 |
| Slide Preparation | 5 |
| Spotting | 7 |
| Practical Record + Viva Voce | 4 |
| Investigatory Project and its Project Record + Viva Voce | 5 |
| Total | 30 |
| S.No. | Typology of Questions | Very Short Answer (VSA) (2 Marks) | Short Answer-I (SA-I) 2 Marks | Short Answer-II (SA-II) (3 marks) | Long Answer (LA) (5 marks) | Total Marks | Percentage |
|---|---|---|---|---|---|---|---|
| 1. | Remembering- (Knowledge based Simple recall questions, to know specific facts, terms, concepts, principles, or theories, Identify, define, or recite, information) | 2 | 1 | 1 | – | 7 | 10% |
| 2. | Understanding- (Comprehension – To be familiar with meaning and to understand conceptually, interpret, compare, contrast, explain, paraphrase information) | – | 2 | 4 | 1 | 21 | 30% |
| 3. | Application (Use abstract information in concrete situation, to apply knowledge to new situations,Use given content to interpret a situation, provide an example, or solve a problem) | – | 2 | 4 | 1 | 21 | 30% |
| 4. | Evaluating & Analysis – Classify, Compare, Contrast, or differentiate between different pieces of information, Organize and/or integrate unique pieces of information from a variety of sources) | 2 | 1 | 1 | 1 | 12 | 17% |
| 5. | Creating – (Appraise, judge, and/or justify the value or worth of a decision or outcome, or to predict outcomes based on values) | 1 | 1 | 2 | – | 9 | 13% |
| Total | 5×1=5 | 7×2=14 | 12×3=36 | 3×5=15 | 70(27) | 100% |
Even if you are studying for the board exam in one day, you can surely get good marks in Biology provided you don’t panic and study earnestly.
Do not use any other reference books except for NCERT and maybe, Arihant Chapterwise if you have time.
Firstly, know the breakdown of the chapters/units
- Do Genetics. That includes Principle of Inheritance, Molecular Basis of Inheritance, Evolution. These 3 chapters can easily fetch you 18 marks. This should take you about 3 hours or so.
- Since covering an entire unit of Genetics can be tiresome, do the last unit which talks all about the environment after that. I think reading each chapter twice should do it. It talks about advantages of CNG, disadvantages of Petrol, Global warming, sewage treatment. These 4 chapters can fetch you 14 marks.
- Biotechnology- Principles and Application. Again, if you read the chapter line by line, underline the definitions, make possible questions, you can do these two chapters in about 3 hours or so. These 2 chapters are of 10 marks.
- Reproduction in Flowering Plants. Read the chapter along with diagrams.
Before sleeping, just go through the scientific names of microbes and their uses in the chapter related to Microbes and read Human Health once.
Next morning, you can easily do Human reproduction, Human health, Strategies of Food production and Microbes.
It shouldn’t take you more than 3 hours.
Biology Most Important Questions Pdf – Click to download
Chemistry 150 Most important Questions – Download
Class 12 Important Question With Solution
| Topic | Link |
|---|---|
| Physics Imp Question | Click |
| Chemistry Imp Question | Click |
| Mathematics Imp Question | Click |
| Physical Education Imp Question | Click |
| English Imp question | Click |
| Top Engineering Exams Apply | Click |
| COLLEGE REVIEWS | Click |
| Biology Imp Question | Click |
Understand CBSE Class 12th Board Pattern
You have allocated total 3 hour to solve the entire paper of class 12 biology and having full marks 70 and rest 30 marks will be allocated for practice exam conducted by your school and fixed syllabus of practice will be followed for this. It is important to have good understand about the new pattern of CBSE class 12 biology there is major change for class 12th board exam of CBSE biology from 2020.In 3 hours of time you will get different biology paper as compared to 2019.
What is the difference? To answering this questions CBSE board applied lot of new thinks in class 12 Biology papers such as now the class 12 Biology paper consist of different types of questions having marks range 1 to 5.40% weightage is given to objective type questions and these are not only MCQ based but also consist of fill in the blanks.True and false, single sentence answers or short one liner answer type.Start your preparation accordingly. Students can also access the class 12 notes from here.
CBSE Class 12 Exam Pattern Highlights
Check the key highlights about the CBSE class 12 exam pattern from the below table:
| Particulars | Details |
|---|---|
| Name of the Exam | CBSE Senior Secondary Examinations 2023 |
| Conducted By | Central Board of Secondary Examination (CBSE) |
| Mode of Exam | Offline |
| Frequency | Once in a year |
| Type of Question | MCQs and Application Based Questions |
| Total Number of Subject | 5 or 6 (As elected) |
| Maximum Marks | 100 (80 marks in written exam and 20 marks for internal assessments and projects) |
| Total Time | 3 hours |
| Passing Marks | 33% (each subject) and 33% (aggregate) |
| Medium of Exam | English/Hindi |
CBSE Class 12 Marking Scheme 2023
The division of marks weightage for board exams 2023 is given below:
| Type of Questions | Weightage |
|---|---|
| Competency Based Questions would be minimum 30% (Multiple Choice Questions, Case Studies, Source based Integrated Questions etc.) | 30% (Minimum) |
| Objective Type Questions | 20% |
| Short Answer/Long Answer Questions | 50% (as per existing pattern) |
CBSE Class 12 Assessment Scheme 2022-23
In the academic year 2022-23, CBSE will be implementing the old exam pattern which was followed up to 2020. As per the revised CBSE 12th exam pattern, there will be one exam in the year. The full marks for every subject will be 100 marks (80 for written exam and 20 for internals and viva). Along with class 12 exam pattern the syllabus has also been revised for the session 2022-23.
CBSE Assessment Scheme Details
- Only one exam will be conducted at the end of the academic session by CBSE Board.
- Syllabus for some of the subjects will be reduced by 30%, similarly as the previous two sessions.
- Efforts will be made to make Internal Assessment/ Practical Project work more credible and valid as per the guidelines and Moderation Policy to be announced by the Board to ensure fair distribution of marks.
CBSE Class 12 Examination Details
- For AY 2022-23, CBSE 12th exams will be conducted tentatively in the month of February-March 2023.
- The question paper will contain Multiple Choice Questions (MCQs), short and long answer type questions.
- The total duration of the exam will be 3 hours.
- CBSE 12th practice papers are also released as per the new exam pattern.
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