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CBSE Class 12 Biology Syllabus 2025-2026 Updated - Deleted Class 12 Biology Syllabus

By Shailendra Singh

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Updated on 10 Jul 2025, 13:08 IST

CBSE Class 12 Biology Syllabus 2025-2026: Central Board of Secondary Education (CBSE Board) has released the latest CBSE class 12 biology syllabus for this academic year. You can download the class 12 biology syllabus pdf from the official CBSE website @cbseacademic.nic.in or Infinity Learn educational sites too.

The biology class 12 syllabus chapter wise covers all the chapters, topics, and modules you need to study for both theory and practicals. It also shows how much marks each topic will get in the exam, which is pretty helpful when you plan your studies. Many students prefer to keep the CBSE Class 12 Syllabus PDF handy while preparing for the CBSE Class 12 Board exams, so you can check topics anytime.

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If you read this whole guide, you’ll get to know about the complete cbse class 12 biology syllabus 2025-26, the marking scheme, how to download the PDF, some easy preparation tips and some handy prep tips, just scroll down and read the full article.

CBSE Class 12 Biology Syllabus 2025-2026 Updated

Class 12 Biology Syllabus 2025-26 Overview

The CBSE class 12 biology syllabus for 2025-26 is really helpful for students who want to learn about life and living things. In this CBSE Board syllabus, you will study topics like cell biology, molecular biology, genetics, evolution, ecology, and human health. For example, in cell biology, you will learn about cell structure, how cells divide, and how they communicate with each other.

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Then, molecular biology will teach you about DNA structure and how DNA copies itself, as well as how proteins are made in our bodies. Sometimes, it gets confusing, but NCERT Solutions for Class 12 Biology can help you understand these things better. Genetics is also a big part of the CBSE Class 12 Syllabus, covering Mendelian genetics, molecular genetics, and even genetic engineering, which is kind of cool but a bit hard to remember sometimes.

Ecology is all about the biosphere, ecosystems, and biodiversity, which means you will learn about different living things and how they live together. Human health is also covered, so you will learn about the human body, diseases, and how our immune system protects us. 

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CBSE Class 12 Biology Syllabus 2025-26 PDF Download

The CBSE Class 12 Biology Syllabus for 2025-26 is a helpful guide for students studying Biology. It includes all the chapters and topics students will learn during this school year. Knowing the syllabus helps students plan their studies better. It allows them to divide their time properly for each chapter and learn everything completely. Students can download the CBSE Class 12 Biology Syllabus PDF from the link provided below.

CBSE Class 12 Biology Syllabus 2025-26 Marking Scheme

The CBSE Class 12 Biology syllabus helps students understand which topics are important and how marks are distributed. It guides students to prepare properly for the CBSE board exams. Also, studying the CBSE Class 12 Biology syllabus is helpful when preparing for other competitive exams like NEET. The theoretical papers will be worth 70 marks, while the practical tests will be worth thirty marks.

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CBSE Class 12 Biology Syllabus Marking Scheme
TopicsMarks
Reproduction16
Genetics and Evolution20
Biology and Human Welfare12
Biotechnology and its Applications12
Ecology and Environment10
Total70

CBSE Class 12 Biology Syllabus (2025-26) Important Topics

To help students understand the chapters clearly, the important topics from each unit are presented in the table below. For the full syllabus, students can click the link provided above.

UnitChapterMain Topics Covered
Unit VI: ReproductionChapter 1: Sexual Reproduction in Flowering PlantsStructure of flower, pollination, fertilization, seed and fruit development, special reproduction methods like apomixis and polyembryony.
Chapter 2: Human ReproductionMale and female reproductive systems, fertilization, pregnancy, placenta, childbirth, lactation.
Chapter 3: Reproductive HealthSexual health, prevention of STDs, contraception methods, infertility, and assisted reproductive technologies.
Unit VII: Genetics and EvolutionChapter 4: Principles of Inheritance and VariationMendelian genetics, inheritance patterns, chromosome theory, genetic disorders.
Chapter 5: Molecular Basis of InheritanceDNA and RNA structure, replication, genetic code, transcription, translation, gene regulation.
Chapter 6: EvolutionOrigin of life, evidence and mechanisms of evolution, Darwin’s theory, human evolution.
Unit VIII: Biology and Human WelfareChapter 7: Human Health and DiseasesHuman diseases, immunity basics, vaccines, cancer, AIDS, drug abuse.
Chapter 8: Microbes in Human WelfareRole of microbes in food, industries, waste treatment, antibiotics, and biofertilizers.
Unit IX: Biotechnology and its ApplicationsChapter 9: Biotechnology - Principles and ProcessesBasics of genetic engineering and recombinant DNA technology.
Chapter 10: Biotechnology and its ApplicationsBiotechnology uses in medicine and agriculture, gene therapy, GMOs, ethical concerns.
Unit X: Ecology and EnvironmentChapter 11: Organisms and PopulationsInteractions between populations, population growth, birth and death rates.
Chapter 12: EcosystemStructure and components of ecosystems, energy flow, ecological pyramids.
Chapter 13: Biodiversity and Its ConservationBiodiversity importance, conservation methods, endangered species, biosphere reserves, wildlife sanctuaries.

CBSE Class 12 Biology Practical Syllabus 2025-26

CBSE Class 12 Biology practicals help students understand biological concepts clearly through hands-on experiments. These practicals are useful for future courses such as MBBS and BDS. Below is the complete practical syllabus divided into three main sections.

Part A – List of Experiments

  • Prepare a temporary mount to observe pollen germination.
  • Study plant population density using the quadrat method.
  • Study plant population frequency using the quadrat method.
  • Prepare a temporary mount of onion root tip to study mitosis.
  • Isolate DNA from plant material (e.g., spinach, green pea seeds, papaya).

Part B – Spotting (Observation & Identification)

  • Flowers adapted to different types of pollination (wind, insects, birds).
  • Pollen germination on stigma through slides or SEM images.
  • Stages of gamete development (testis and ovary sections).
  • Meiosis in onion bud cells or grasshopper testis through slides.
  • Blastula stages through permanent slides (mammalian).
  • Mendelian inheritance using seeds with different traits.
  • Pedigree charts showing traits like tongue rolling and blood groups.
  • Controlled pollination methods – emasculation, tagging, and bagging.
  • Study common disease-causing organisms (Entamoeba, Plasmodium, Ascaris, fungi causing ringworm).
  • Models showing symbiotic relationships (leguminous plants, Cuscuta, lichens).
  • Flashcards of homologous and analogous organs.

Part C – Practical Activities

  • Study flowers adapted for pollination.
  • Identify frog morula or blastula stages through models.
  • Study mammalian inheritance patterns using beads or seeds.
  • Prepare pedigree charts for genetic traits.
  • Practice emasculation, tagging, and bagging for pollination.
  • Identify common pathogens and learn associated diseases.
  • Comment on plant adaptations in xerophytic conditions.

CBSE Class 12 Marking Scheme for Biology Practical

Evaluation ComponentMarks
One Major Experiment5
One Minor Experiment (Experiments 2 & 3)4
Slide Preparation (Experiments 1 & 4)5
Spotting7
Practical Record + Viva4
Investigatory Project + Project Record + Viva5
Total30

CBSE Class 12 Biology Question Paper Design 2025-26

CompetenciesWeightage (%)
Knowledge and Understanding50%
Application of Concepts30%
Analyse, Evaluate and Create20%

How to Download CBSE Class 12 Biology Syllabus 2025-26

To Download the CBSE Class 12 Biology Syllabus for the academic year 2025-26 is a simple and important step in your exam preparation. Here’s how you can do it:

  • Visit the Official CBSE Website: Go to the official CBSE website at @cbse.gov.in.
  • Navigate to the ‘Academic’ Section: On the homepage, look for the “Academic” tab in the top menu and click on it.
  • Select ‘Curriculum 2025-26’: In the academic section, find and select the option for Curriculum 2025-26. This will take you to a page listing various subjects and their syllabi.
  • Choose Science Stream: On the curriculum page, look for the Senior Secondary Curriculum and choose the Science stream.
  • Click on Biology Syllabus: Scroll down to find the Biology subject, and click on the download link for the 2025-26 syllabus.
  • Download and Save: The PDF file for the syllabus will open, and you can either save it to your device or print it for reference.

By following these simple steps, you’ll have the updated syllabus that is essential for effective planning and preparation.

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Deleted Topics from CBSE Class 12 Biology Syllabus

UnitsChaptersDeleted Topics
ReproductionReproduction in OrganismsEntire chapter deleted
Biology & Human WelfareStrategies for Enhancement in Food ProductionEntire chapter deleted
Ecology & EnvironmentEnvironmental IssuesEntire chapter deleted

Deleted Practicals for CBSE Class 12 Biology

  • Soil and water testing from different locations.
  • Study particulate matter in the air.
  • Effect of temperature and pH on enzyme activity.
  • Observations of morphological adaptations in plants and animals in xeric and aquatic conditions.

CBSE Class 12 Biology Preparation Tips 2025

Preparing for the CBSE Class 12 Biology exam requires strategic study, as the subject is content-heavy and highly conceptual. Here are some effective tips to help you score well:

  • Understand the Syllabus: Start by thoroughly understanding the syllabus and focusing on high-weightage chapters such as Genetics, Ecology, and Human Reproduction. Prioritize topics based on past question patterns.
  • NCERT Mastery: Make the NCERT Biology textbook your bible. Nearly all exam questions are based on NCERT Solutions content, so ensure you grasp every concept, diagram, and line thoroughly.
  • Create Short Notes: While studying, make concise notes for each chapter. Highlight key definitions, diagrams, and processes. These notes will be invaluable for quick revisions.
  • Practice Diagrams: Biology involves a lot of diagrams, so practice drawing and labeling them neatly. Diagrams like the Human Digestive System and Cell Structure often appear in exams, and drawing them accurately can earn you extra marks.
  • Solve Previous Year Papers: Solving past years’ question papers and sample papers will help you understand the exam format and commonly asked questions. This practice also improves your time management skills during the exam.
  • Regular Revision: Dedicate time daily for revising previously studied topics. Revision solidifies your understanding and ensures better retention.
  • Focus on Practical Experiments: Practical questions based on lab work are a crucial part of the exam. Make sure to go through all experiments, understand the concepts behind them, and practice writing detailed answers.
  • Mock Tests: Take periodic mock tests to evaluate your preparation level and to practice under timed conditions. Analyze your mistakes and work on weak areas.
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CBSE Class 12 Biology Syllabus 2025-2026 FAQs

What is the deleted syllabus of class 12 cbse 2025-26 of Biology?

In the Class 12 Biology syllabus for 2025-26, some chapters have been entirely removed. These chapters are Reproduction in Organisms, Strategies for Enhancement in Food Production, and Environmental Issues.

What is the syllabus for Biology Class 12 Board exam 2026?

The course includes five parts: Making new living things, Traits and Change over time, Life Science and Human Health, Using biology in technology, and Nature and Surroundings.

What is the marking scheme for Biology class 12 syllabus 2025-26?

In this case, 70 points will be awarded for the written exam, and the other 30 points will be for the hands-on part.

How many chapters are there in class 12 Biology?

The Class 12th Biology NCERT Solutions have 16 chapters designed by the National Council of Educational Research and Training (NCERT) for schools that follow the Central Board of Secondary Education (CBSE).