Each chapters and topics in CBSE Class 12th Biology exam has different weightage. Knowing about the weightage helps students prioritise topics accordingly. Check here CBSE Class 12th Biology Weightage 2026!
Table of Contents
The CBSE Class 12th Biology Weightage 2026 covers the unit-wise, chapter-wise marks distribution along with the marks distribution in internal assessment. Before you appear for the CBSE Class 12th Exam 2026, you are advised to check the weightage of every subject carefully. The theory exam is conducted for 70 marks, and the internal assessment is 30 marks. The CBSE Class 12th Biology Syllabus is divided into five units, which are further divided into various chapters.
If you check the CBSE Class 12th Biology Weightage 2026 carefully, you will find that, unit "Genetics and Evolution" has high weightage in the exam among all other units. Then the unit " Reproduction" comes, and after that the rest units. Checking the weightage does not mean you have to study the high-weightage units only. This means that you have to focus more on units that have high weightage and revise them multiple times, and also have to study the low weightage chapters. In case you have less time, then you can only study the high-weightage topics.
Read the entire article to know what is the unit-wise and chapter-wise weightage of CBSE Class 12th Biology.
CBSE Class 12th Biology Exam Pattern 2026
You should know the CBSE Class 12th Biology Weightage 2026 along with the CBSE Class 12th Biology Exam Pattern 2026. The exam pattern will help you in understanding what the exam paper looks like. In the CBSE Class 12th Biology exam 2026, there will be five sections and a total of 33 questions. The total marks for which the exam will be conducted are 70. The exam will consist of objective, description, and case-based questions, which encourage you to focus more on concepts rather than rote learning. A detailed breakdown is provided below for the CBSE Class 12th Exam Pattern 2026.
|
Sections |
Types of Question |
Number of Questions |
Total Marks |
|
A |
Multiple Choice Questions or Assertion-reason-based questions |
16 |
16 (One mark each question) |
|
B |
Short Answer Question |
5 |
12 (Two marks each question) |
|
C |
Short Answer Question |
7 |
21 (Three marks each question) |
|
D |
Case-based questions |
2 |
8 (Four marks each question) |
|
E |
Long Answer Question |
3 |
15 (Five marks each question) |
|
Total |
33 questions |
70 |
|
CBSE Class 12th Biology Unit-Wise Weightage 2026
There are five units in CBSE Class 12th Biology. The two units "Biology and Human Welfare" and "Biotechnology and its application" consist of 12 marks each. The remaining units have different weightage. The highest weightage is of the unit "Genetics and Evolution". The following table summarises the CBSE Class 12th Biology Weightage 2026 as per the units.
|
Units |
Marks Weightage |
|
Reproduction |
16 |
|
Genetics and Evolution |
20 |
|
Biology and Human Welfare |
12 |
|
Biotechnology and its application |
12 |
|
Ecology and Environment |
12 |
|
Total |
70 marks |
Also Read: CBSE Class 12th Biology Syllabus 2026
CBSE Class 12th Biology Chapter-Wise Weightage 2026
There are a total of 13 chapters that cover the entire units of the CBSE Class 12th Biology. Knowing the chapter-wise weightage is also important. You get to know which chapter carries how much weightage. In CBSE Class 12th Biology Weightage 2026, chapter one under the unit "Reproduction" carries more weightage. The chapter that carries the most weightage among others is "Human Health and Diseases," which carries 9 marks. You can see the CBSE Class 12th Biology Chapter-Wise Weightage 2026 in detail from the table below.
|
Units |
Chapters |
Marks Weightage |
|
Reproduction |
Chapter 1: Sexual Reproduction in Flowering |
7 |
|
Chapter 2: Human Reproduction |
6 |
|
|
Chapter 3: Reproductive Health |
3 |
|
|
Genetics and Evolution |
Chapter 4: Principles of Inheritance and Variation |
8 |
|
Chapter 5: Molecular Basis of Inheritance |
8 |
|
|
Chapter 6: Evolution |
4 |
|
|
Biology and Human Welfare |
Chapter 7: Human Health and Diseases |
9 |
|
Chapter 8: Microbes in Human Welfare |
3 |
|
|
Biotechnology and its application |
Chapter 9: Biotechnology- Principles and Processes |
6 |
|
Chapter 12: Biotechnology and Its Applications |
6 |
|
|
Ecology and Environment |
Chapter 11: Organisms and Populations |
5 |
|
Chapter 12: Ecosystem |
3 |
|
|
Chapter 13: Biodiversity and Conservation |
2 |
|
|
Total |
70 marks |
|
Also Read: CBSE Class 12th Biology Preparation
CBSE Class 12th Biology Internal Assessment Weightage 2026
The CBSE Class 12th Biology Weightage 2026 says that the CBSE Class 12th Internal Assessments are of 30 marks overall. These marks are distributed among various components. You can check which component is allotted how many marks from the table shown below.
|
Components |
Marks Allotted |
|
Finding out the apparatus name |
05 |
|
A written test |
12 |
|
Practical Records |
05 |
|
Viva |
12 |
|
Total |
30 |
Also Read: CBSE Class 12th Biology Previous Year Question Papers 2026
Tips to Score High Using CBSE Class 12th Biology Weightage 2026
The points mentioned below will help you know the tips that can help you immensely to use the CBSE Class 10 Biology Weightage 2026 for scoring high marks.
- Firstly, get the PDF of CBSE Class 12th Biology Weightage 2026. Refer to it when you are studying any unit or chapter.
- When you are studying a unit, check the CBSE Class 12th Biology Weightage 2026 to know in that unit, which chapter carries high weightage. The chapter that carries high weightage is important, and you have to focus more on that.
- When you are revising the Biology subject, also, check the CBSE Class 12th Biology Weightage 2026 once, so that you can once again make yourself aware of the high-weightage topics.
- Along with high-weightage chapters, you have to focus on low-weightage chapters also. These chapters will also help you score good marks.
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