CBSE Class 12 Biology Weightage 2026 Unit and Chapter-Wise Marks Distribution

CBSE Class 12 Biology Weightage for all chapters is mentioned here. Check the marks distribution in detail and prepare the chapters accordingly. More focus can be given on chapters with high marks. Continue reading the article for more information.

Table of Contents

Class 12 Biology Weightage 2026 Theory Exam - Chapter Wise
CBSE Class 12 Biology Weightage 2026 Practical Exam
CBSE Class 12 Biology Question Paper Blueprint 2026

CBSE Class 12 Biology Weightage 2026 : The subject is divided into a theory exam and a practical exam of 70 marks and 30 marks, respectively. In the theory exam, Genetics and Evolution carry the highest marks. The students will find questions worth 20 marks from this chapter. Besides this, students can check the marking scheme for each of the chapters from the table provided below in the article. When preparing the CBSE Class 12 Biology Syllabus 2025-26 , students can check the marks for each of the chapters. According to the marks, they can prepare the topics and questions. For more details about the CBSE Class 12 Biology chapter-wise weightage, you can continue reading the article.

Class 12 Biology Weightage 2026 Theory Exam - Chapter Wise

From the following table, check out the names of the units, the chapters included in each unit and the weightage given to each chapter.

Unit	Chapter	Weightage
Unit VI: Reproduction	Sexual Reproduction in Flowering Plants	7 marks
	Human Reproduction	6 marks
	Reproductive Health	3 marks
	Total	16 marks
Unit VII: Genetics and Evolution	Principles of Inheritance and Variation	8 marks
	Molecular Basis of Inheritance	8 marks
	Evolution	4 marks
	Total	20 marks
Unit VIII: Biology and Human Welfare	Human Health and Diseases	9 marks
	Microbes in Human Welfare	3 marks
	Total	12 marks
Unit IX: Biotechnology and Its Applications	Biotechnology - Principles and Processes	6 marks
	Biotechnology and Its Applications	6 marks
	Total	12 marks
Unit X: Ecology and Environment	Organisms and Populations	5 marks
	Ecosystem	3 marks
	Biodiversity and Its Conservation	2 marks
	Total	10 marks

Also Check CBSE Class 12 Biology Important Questions 2026

CBSE Class 12 Biology Weightage 2026 Practical Exam

The practical exam will be of 30 marks. Check out the following details and aim at performing your best.

Evaluation Scheme for Examination	Marks
One Major Experiment	5 Marks
One Minor Experiment	4 Marks
Slide Preparation	5 Marks
Spotting	7 Marks
Practical record + viva voce	4 Marks
Investigatory project and its project record + viva voce	5 Marks

CBSE Class 12 Biology Question Paper Blueprint 2026

When preparing for the board exams, students should go through the blueprint. It gives an idea of the types of questions asked in the exam and marks allotted to each of the sections in the question paper.

The Biology Question paper is divided into five parts: A, B, C, D, and E.
Section A includes 16 multiple-choice questions of 1 mark each.
Section B consists of 5 short questions for 2 marks each.
Section C contains 7 short questions of 3 marks each.
Section D consists of 2 case-based questions of 4 marks each.
Section E consists of 3 long questions of 5 marks each.

S. No.	Competencies	Weightage (%)
1.	Demonstrate Knowledge and Understanding	50
2	Application of Knowledge/Concepts	20%
3	Analyse, Evaluate and Create	30%
-	Total	100%

For better performance in exams, students can regularly solve the CBSE 12th Biology Sample Paper 2025-26 and practice a variety of questions. Regularly visit the page for the latest information about the CBSE Class 12 Biology Weightage 2026.

Students can also check the weightage of other subjects from the links added below:

CBSE Class 12 Chemistry Weightage 2026	CBSE Class 12 Physics Weightage 2026
CBSE Class 12 Math Weightage 2026	CBSE Class 12 English Weightage 2026

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Are the LPUNEST PYQs available?

-naveenUpdated on January 16, 2026 05:49 PM

71 Answers

vridhi, Student / Alumni

Yes, LPU PYQ are available for practical and students can easily access sample papers and previous year papers through LPU official site and student support. these papers help in understanding exam pattern and preparing better, LPU always supports students with proper guidance and resources. In addition the official website also provides sample papers to help students with their preparation.

What kind of laboratory, farm, and research facilities are available for B.Sc. Agriculture students at Alpine Group of Institutes.

-PavitraUpdated on January 16, 2026 01:37 PM

1 Answer

Aindrila, Content Team

At Alpine Group of Institutes (AGI), Dehradun, B.Sc. Agriculture students get access to a mix of practical labs and field exposure to support hands-on learning. The institute has well-equipped laboratories where students work on crop science, soil testing, plant pathology and related experiments. They also engage in fieldwork and practical farm activities as part of the curriculum, gaining real-world experience in crop production and farm management.

How do I prepare for NMIMS and Somaiya BBA program?

-ArchanaUpdated on January 16, 2026 12:50 PM

1 Answer

Aindrila, Content Team

You need to understand the exam pattern first and focus on arithmetic (percentages, ratios, profit & loss), algebra basics, and data interpretation to build strong fundamentals. Solve mock tests and previous-year questions to improve speed and accuracy. You can also analyse mistakes after each mock to identify weak areas.