This page provides a comprehensive outline of the Class XII Biology syllabus for the academic year. It covers all the essential units and topics as per the latest guidelines. The syllabus includes detailed study areas such as Genetics, Evolution, Biotechnology, Ecology, and Human Physiology, ensuring students gain a thorough understanding of both theoretical and practical aspects of the subject.
Additionally, the marking scheme outlines the distribution of marks for each unit, helping students focus on the key areas to score well. The scheme also highlights the weightage of practicals, project work, and internal assessments, making it easier for students to plan their study strategy and excel in their final examinations.
|
Class |
Subject Code |
Subject Name |
Theory Marks |
Time (h) |
Internal Assessments Marks |
Total Marks |
Group |
|
12 |
44 |
Biology |
70 |
3 |
30 |
100 |
Group A |
The Class XII Biology syllabus, as outlined by the CBSE, is designed to provide students with a deep understanding of various biological concepts and their applications. The Class 12 Biology syllabus is designed to cover key concepts and skills essential for academic development. Overall, the Class XII Biology syllabus aims to prepare students for higher studies in life sciences, medical fields, and research, while also fostering an appreciation for biological diversity and sustainability. exams.
|
Class XII Biology Syllabus & Marking Scheme (2026-27) |
||||
|
Unit |
Unit Name |
Chapters & Topics |
Marks |
Weightage |
|
Unit-VI |
Reproduction |
Sexual Reproduction in Flowering Plants:Flower structure; gametophyte development; pollination; pollen-pistil interaction; double fertilization; post-fertilization events; seed and fruit development; apomixis, parthenocarpy, polyembryony. |
16 |
22.86% |
|
Human Reproduction:Male and female reproductive systems; testis and ovary anatomy; gametogenesis (spermatogenesis and oogenesis); menstrual cycle; fertilization, embryo development, blastocyst, implantation, pregnancy, parturition, lactation. |
||||
|
Reproductive health:STDs; birth control methods; contraception and MTP; amniocentesis; infertility; ART (IVF, ZIFT, GIFT). |
||||
|
Unit-VII |
Genetics and Evolution |
Principles of Inheritance and Variation:Mendelian inheritance; incomplete dominance, co-dominance, multiple alleles, blood groups; polygenic inheritance; chromosome theory; sex determination; linkage, crossing over; sex-linked inheritance; Mendelian and chromosomal disorders. |
20 |
28.57% |
|
Molecular Basis of Inheritance:Genetic material (DNA and RNA); DNA packaging, replication, transcription, translation; gene expression and regulation (lac operon); Human and rice genome projects; DNA fingerprinting. |
||||
|
Evolution:Origin of life; biological evolution; Darwin’s theory; modern synthetic theory; natural selection, genetic drift, Hardy-Weinberg principle; human evolution. |
||||
|
Unit-VIII |
Biology and Human Welfare |
Human Health and Diseases:Pathogens, parasites, human diseases (malaria, dengue, typhoid, etc.); immunology; cancer, HIV, AIDS; drug and alcohol abuse. |
12 |
17.14% |
|
Microbes in Human WelfareMicrobes in food processing, industrial production, sewage treatment; bio-control agents, bio-fertilizers; antibiotics. |
||||
|
Unit-IX |
Biotechnology and its Applications |
Biotechnology - Principles and Processes:Genetic Engineering (Recombinant DNA Technology). |
12 |
17.14% |
|
Biotechnology and its Applications:Applications in health and agriculture; Human insulin, vaccine production, stem cell technology, gene therapy; GMOs (Bt crops), transgenic animals, biosafety, biopiracy. |
||||
|
Unit-X |
Ecology and Environment |
Organisms and Populations:Population interactions (mutualism, competition, predation, parasitism); population growth, birth rate, death rate, age distribution. |
10 |
14.29% |
|
Ecosystem:Ecosystem components, productivity, decomposition; energy flow; pyramids of number, biomass, and energy. |
||||
|
Biodiversity and its Conservation:Biodiversity: concept, patterns, importance; loss of biodiversity; conservation, hotspots, endangered species, extinction; Red Data Book, biosphere reserves, national parks, wildlife sanctuaries. |
||||
|
Total |
70 |
100.00% |
||
Whether you're aiming for high scores in the board exams or preparing for competitive exams, knowing the weightage of each chapter and understanding the paper pattern will allow you to focus on important topics and manage your study time wisely. The marking scheme provides a breadkdown of the marks allocated to each chapter.
|
Class XII Biology Marking Scheme & Chapter-wise Weightage (2026-27) |
||||
|
Unit |
Unit name |
Chapters |
Marks |
Weightage |
|
VI |
Reproduction |
-Sexual Reproduction in Flowering Plants |
16 |
22.86% |
|
-Human Reproduction |
||||
|
-Reproductive Health |
||||
|
VII |
Genetics and Evolution |
-Principles of Inheritance and Variation |
20 |
28.57% |
|
-Molecular Basis of Inheritance |
||||
|
-Evolution |
||||
|
VIII |
Biology and Human Welfare |
-Human Health and Diseases |
12 |
17.14% |
|
-Microbes in Human Welfare |
||||
|
IX |
Biotechnology and its Applications |
-Biotechnology - Principles and Processes |
12 |
17.14% |
|
-Biotechnology and its Applications |
||||
|
X |
Ecology and Environment |
-Organisms and Populations |
10 |
14.29% |
|
-Ecosystem |
||||
|
-Biodiversity and its Conservation |
||||
|
Total |
70 |
100.00% |
||
The exam pattern for Class 12 Biology includes a mix of objective, subjective, and analytical questions. Understanding the exam pattern helps students focus on the structure of the exam, including the types of questions, marks distribution, and time allocation. Here’s an overview of the question format and total marks.
|
Class XII Biology Exam Pattern (2026-27) |
|||
|
Type of Questions |
No. of Questions |
Marks Per Question |
Total Marks |
|
MCQ |
16 |
1 |
16 |
|
Very short answer type |
5 |
2 |
10 |
|
short answer type |
7 |
3 |
21 |
|
case based questions |
2 |
4 |
8 |
|
long answer type |
3 |
5 |
15 |
|
Total |
33 |
70 |
|
|
Internal Assessment |
30 |
||
|
Grand Total |
100 |
||
|
Class XII Biology Practical Assessment (2026-27) |
|
|
Evaluation Scheme |
Marks |
|
One Major Experiment |
5 |
|
One Minor Experiment (Experiments 2 & 3) |
4 |
|
Slide Preparation (Experiments 1 & 4) |
5 |
|
Spotting |
7 |
|
Practical Record + Viva Voce (Credit for work over the academic session) |
4 |
|
Investigatory Project and its Project Record + Viva Voce |
5 |
|
Total |
30 |
Here is the latest paper design of class 12th Biology subject.
|
Class XII biology Question Paper Design & Weightage (2026-27) |
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|
S.No. |
Competency |
Description |
Marks |
Weightage (%) |
|
1 |
Demonstrate Knowledge and Understanding |
This section evaluates the students’ ability to recall, define, and explain mathematical concepts, theories, and facts. The questions will focus on understanding and exhibiting knowledge of key concepts like functions, algebra, calculus, etc. |
40 |
50% |
|
3 |
Application of Knowledge / Concepts |
Questions will require applying the acquired knowledge to solve problems, interpret results, and use mathematical techniques in different contexts. This could include real-life situations requiring the application of calculus, probability, vectors, etc. |
24 |
30% |
|
4 |
Analyse, Evaluate, and Create |
This segment includes questions that require analytical thinking, problem-solving, and the creation of new solutions. Students will analyze information, make judgments, and solve complex problems involving mathematical reasoning, interpretations, or evaluations. |
16 |
20% |
|
Total |
80 |
100% |
||
The following chapter list represents the current mapped curriculum for academic session 2026-27.
These chapters belong to earlier NCERT editions and are retained for historical reference and students using older books.
Understanding the Class 12 Biology syllabus and marking scheme is essential for any student aiming to perform well in their CBSE board exams. Here’s why:
Structured Preparation: The syllabus serves as a roadmap, outlining all the topics and chapters you need to study. By knowing exactly what’s required, you can organize your study schedule effectively and avoid last-minute confusion.
Focus on High-Weightage Topics: The marking scheme reveals the weightage of different units, allowing you to prioritize important topics. This helps in allocating more time to chapters that carry higher marks, maximizing your scoring potential.
Time Management: By understanding the marks distribution and paper pattern, you can plan how much time to spend on each section during the exam. This ensures that you answer all questions without running out of time.
Clarity on Question Formats: The marking scheme also provides insights into the types of questions that may appear—such as multiple-choice, short-answer, and long-answer questions. Familiarity with the question patterns helps reduce exam-day anxiety and increases your confidence in tackling the paper.
Better Internal Assessment Preparation: Apart from theory, Class 12 Biology includes practical exams, project work, and internal assessments. Knowing how much these contribute to your overall grade ensures that you give them proper attention alongside your theory preparation.
In short, being well-versed with the syllabus and marking scheme empowers you to study strategically, focus on key areas, and manage your time efficiently during the exam.
Class 12 Biology can be a challenging subject, but with the right preparation strategy, you can excel in both theory and practicals. Here are some tips to help you prepare effectively:
Understand the Concepts: Biology is a conceptual subject, and rote memorization won’t be effective in the long run. Ensure you understand the underlying concepts in each chapter. Use diagrams, flowcharts, and tables to grasp complex processes like Genetics, Human Physiology, and Ecology.
Stick to the NCERT Textbook: For CBSE exams, the NCERT Biology textbook is your primary source. Make sure you read every chapter thoroughly and solve the in-text and end-of-chapter exercises. Many questions in the board exam are directly based on NCERT content.
Create a Study Schedule: Divide the syllabus into manageable parts and create a timetable that covers all topics. Set aside time for revision and practice. Consistency is key, so ensure you dedicate a few hours daily to Biology.
Practice Diagrams: Diagrams are an integral part of the Biology exam. Practice drawing labeled diagrams regularly, as they are often asked in long-answer questions. Well-drawn diagrams can help you score better.
Solve Previous Years’ Papers: Past papers are a great way to familiarize yourself with the exam format and question patterns. Solve at least 5–10 years’ worth of previous question papers and sample papers to gain confidence and improve your speed and accuracy.
Focus on High-Weightage Chapters: Use the marking scheme to identify high-weightage chapters such as Genetics, Biotechnology, and Ecology. Give these topics extra attention while revising.
Revise Regularly: Regular revision is essential to retain what you've studied. Use summary notes, flashcards, and mind maps to quickly revise key concepts before the exam.
Prepare for Practicals: Don’t neglect the practical portion of the syllabus. Review your lab manual, practice the experiments, and understand the key principles behind each one. Practicals carry significant marks, and being well-prepared can boost your overall score.
Stay Updated on Current Developments: Topics like Biotechnology and Ecology often overlap with real-world developments. Keeping yourself informed about recent advances and environmental issues can help you better understand and answer application-based questions.
Stay Calm and Confident: Finally, stay positive and maintain your confidence throughout the preparation process. Stress can hinder your performance, so practice relaxation techniques and ensure you get enough sleep before the exam.
By following these tips and staying consistent in your efforts, you can tackle Class 12 Biology with confidence and achieve excellent results in your board exams.
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