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CBSE Class 12 Biology Notes 2024-25

Last updated date: 15th Jul 2024
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CBSE Biology Notes Class 12 - Free PDF Download

Biology is an interesting subject, and the plus two Biology Notes come in handy to prepare you well for the Class 12 exams. Biology notes Class 12 NCERT made by experts at Vedantu cover the latest CBSE curriculum, and these are the well-researched CBSE notes that let students understand the topic clearly. Biology Notes Class 12 are beneficial for a quick review because the subject matter experts make these. Students can refer to these notes online or even download the PDF version and refer to the Biology Notes Class 12 whenever they wish to.

Detailed Overview of Class 12 Biology Notes


CBSE Class 12



Number of Chapters:



Text, Videos, Images and PDF Format

Academic Year:




Available Materials:

  • Chapter Wise

Other Materials

  • Important Questions

  • NCERT Solutions

Download CBSE Biology Notes for Class 12 Chapter wise PDF 2024-25 

Also, check CBSE Class 12 notes for other chapters:

Competitive Exams after 12th Science

Class 12 Biology Notes PDF

Biology Class 12 notes PDF help students to brush up on the important topics before the exam. These notes let students make the most of their time and prepare well for the exam. The Biology Notes for Class 12 Chapter wise PDF is available on Vedantu, and students can download it and refer to it at their own pace and can be downloaded for free, and students can access it even without an internet connection to revise the topics on the go.

CBSE Class 12 Biology Weightage 2024-25 








Genetics and Evolution



Biology and Human Welfare



Biotechnology and its Applications



Ecology and Environment





Quick Overview on CBSE Biology Class 12 Notes:

Chapter 1 – Reproduction in Organism – Our Notesrevision notes cover the vital concept of how species can live and survive through reproduction. It explains how reproduction is essential for the continuity of any gene.

Chapter 2 – Sexual Reproduction in Flowering Plants - The crucial notes covered in the chapter explains morphology, the structure and the process of sexual reproduction in the flowering plants and how the parts of the flower are formed.

Chapter 3 – Human Reproduction – Our Notesrevision notes cover the male and female reproductive system details. It explains the structure of the sperm and how chromosomes get formed.

Chapter 4 – Reproductive Health - Our Notesrevision notes cover details about the reproductive health issues and its strategies, birth control and population explosion.

Chapter 5 – Principles of Inheritance and Variation – Our Notesrevision notes cover hereditary, genetic disorders, sex determination in humans and the definition of the chromosomes.

Chapter 6 – Molecular Basis of Inheritance – The crucial notes covered in this chapter talk about the genome, a cookbook of life.

Chapter 7 – Evolution – The notes that are covered in this chapter are crucial as it explains the concept of Evolutionary Biology, which is the study of the history of the life forms on earth. It explains the origin of the universe and also talks about the theories through experiments.

Chapter 8 – Human Health and Disease – The crucial notes covered in this chapter tell everything about human health and diseases. It explains how the recent advancement in science and technology have been able to decrease the rate of mortality.

Chapter 9 – Strategies for Enhancement in Food Production – Our Notesrevision notes cover animal breeding, outbreeding and various topics like animal husbandry and germplasm.

Chapter 10 – Microbes in Human Welfare – Our CBSE Class 12 Biology notes PDF explain how microbes are beneficial and detrimental to the welfare of human beings. It also explains how microbes are used in vaccination and how they also act as biocontrol agents.

Chapter 11 – Biotechnology: Principles and Processes – Our Notesrevision notes cover how biotechnology is useful to the welfare of human beings.

Chapter 12 – Biotechnology and its Applications - The crucial notes covered in the chapter talks about how Biology is used to develop technologies and products. It explains the use of Biology in agriculture and other spheres of life.

Chapter 13 – Organisms and Populations – The crucial notes that are covered in this chapter builds on the students' understanding of the relationship between the organisms and the environment that it stays in.

Chapter 14 – Ecosystem – Our Notesrevision notes cover details about the functional unit of nature and our ecosystem and explain how the living organisms interact with each other and the physical environment of their surroundings.

Chapter 15 – Biodiversity and Conservation – Our Notesrevision notes cover the topics on the magnitude of biodiversity, its levels and the threats to biodiversity.

Chapter 16 – Environmental Issues – Our notes explains about pollution and how it is a threat to the environment.

For the 12th Biology Board, the Distribution of Marks Are as Follows

  1. The theory paper constitutes total - 70 marks 

  2. Practicals constitute total - 30 marks 

Subjective Questions benefits For Biology Class 12 Notes:

  • Relevant to the Latest Syllabus and Exam Patterns: Vedantu's basic subjective questions and Biology Class 12 notes are designed to align with the latest syllabus and exam patterns, ensuring that students focus on the most relevant topics and formats that they are likely to encounter in their Class 12 Biology exams.

  • Coverage of Topics: Class 12 Biology notes PDF cover a wide range of topics, allowing students to thoroughly practice and understand various concepts within the subject. This basic subjective questions coverage helps in developing a strong foundation in the subject matter.

  • Detailed and Easy to Understand Answers: Vedantu provides detailed solutions, making it easier for students to grasp complex concepts and learn from their mistakes. 

  • Identification of Weak Areas: By referring to Vedantu's subjective questions and Class 12 notes, students can identify their weak areas and specific topics that require further attention and improvement.

  • Improvement in Problem-Solving Skills: Regularly practicing 1 mark & 2 Mark questions along with NotesRevision notes helps students to develop critical thinking and analytical skills.

  • Boosting Confidence: Subjective questions and Biology Class 12 notes PDF, helps to grow the confidence in the subject and it positively impacts their academic performance in exams.

If you are a student who is preparing for your Class 12 Biology exams, I highly recommend using Vedantu's 1 mark and 2 mark subjective questions. They are a valuable resource that can help you to succeed in your exams.

CBSE Class 12 Biology Notes - Vedantu’s Comprehensive Notes

Class 12 Biology is definitely one of the most important subjects in the academic routine of a student. In Class 12, the importance of learning the concepts of Biology is increased since students are introduced to exclusive topics in this class. These topics are also important from the entrance point of view. Students who have a strong conceptual foundation in Biology can go on to build a good career in that field. Talking about the syllabus of Class 12 Biology, there are 5 units and a total of 16 different chapters in the syllabus. To complete the syllabus of Class 12 biology, students will need to download Biology notes Class 12 from Vedantu.


The subject matter experts at Vedantu have prepared elaborate and well-explained Notes for the Biology chapters. Students will get to learn different concepts such as Reproduction, Biotechnology, Ecology, Environment, Human Welfare, Genetics, Evolution, and so much more. With the help of Class 12th Biology Notes, students will be able to delve deeper into the chapters and build a strong foundation in the field of biology. This will enable them to gain more knowledge about the topics and hence they can easily score high marks in the exams. Following the Notes will allow students to improve their answering skills in the exams by following the CBSE standards as well.


Benefits of Biology Notes Class 12 PDF Download

  • The main advantage of having Class 12 Biology Notes is that you will be able to gain in-depth knowledge about all the chapters and topics in the textbook. This will help you understand the chapters in detail and enhance your chances to score high in the exams.

  • Using the Notes as a proper evaluation tool, you will be able to test your level of preparation in the best way. Follow the notes to see the areas where you need improvement and work on your errors accordingly.

  • These Notes are excellent for doubt clarifications as well. For instance, if you are facing difficulties in the first chapter of the Biology syllabus, the Class 12 Biology Chapter 1 Notes will be able to help clear your doubts.

  • The Vedantu experts have created these Notes according to the CBSE guidelines. After thoroughly going through the question papers of previous years, some of the most important topics were highlighted in the notes. Thus, students can study the notes and figure out the chapters that have significant weightage in the examination. This will help them prepare a strategy beforehand to score good marks.

  • When it comes to revision, students don’t have much time before the exams because they need to read the chapters again and again. Use the Biology Notes Class 12 PDF to your advantage. This will save a lot of time.

CBSE Class 12 Biology Study Materials


With the Class 12 Biology Notes, your study sessions will definitely become much more organised and productive. You will be able to download the notes whenever required and store them to access later on. Refer to the notes according to your convenience and build a proper study routine. Go for Class 12 Biology Notes PDF Download to boost your preparation.

FAQs on CBSE Class 12 Biology Notes 2024-25

1. How to make the maximum use of the Chapter 12 Biology revision notes?

Once you go through the chapter, you can read through the revision notes of that particular Biology chapter. To make the maximum use of these notes, download the notes on your smartphone or any device that you use in your study. The benefits of downloading these notes are that you do not need an internet connection when you need to refer to them again. You can then go through these notes when you are revising the topic. If you feel stuck on any topic, then the categorized notes let you click on the chapter you wish to brush upon.

2. What is the necessity of the revision notes?

Revision is important, be it any subject. Any learning is not complete without proper revision. For better academic performance, students must do proper revision. Revision helps students to recall information. Those students who do not revise well tend to get confused and commit mistakes in the examination. They may also develop anxiety and stress, which in turn, hinders their exam performance. These revision notes are handy and come in use, especially during the exams. Revision is an important aspect, and once you download these revision notes, all you need to do is go through the topics you struggle with and revise them fast.

3. Which chapter in Class 12 Biology requires time to prepare for the examination?

Chapters like “Evolution” and “Principles of Inheritance and Variation” require more concentration as they are very vast. You have to read these chapters again and again and make notes out of them or you can refer to Class 12 Biology Notes on  Vedantu online which you can print and keep with you. Biology is a theoretical subject and you need to read it thoroughly to understand the topics. Hence, give extra time and effort to these topics so that you can score well in your board exams.

4. Which book should I prefer to prepare for Class 12 Biology?

NCERT Biology book is the best book, from which you should prepare for your board examination. NCERT is exhaustive in itself and it has all diagrams and questions which are asked in the examination. Students generally switch to reference books but they should stick to NCERT as it is sufficient from the viewpoint of exam preparation. Reference books are good, but instead of dwelling into depth, you should refer to Class 12 Biology Notes on Vedantu which will provide you with the concepts easily and exhaustively. Vedantu also provides the NCERT Solutions free of cost which are available on the official website and the Vedantu app.

5. Are learning diagrams necessary in Class 12 Biology?

Yes, diagrams hold a very crucial place in Biology. Without diagrams, you cannot imagine what the texts are. These diagrams allow you to learn things easily as you can imagine all things you saw in that diagram. For example, the human eye is a complicated concept but with a diagram, you can remember the terms which are marked. Also, in the board exam, you need to take care of the length of the answer. With diagrams, you can increase the volume of your answer and it will enhance what you’ve written.

6. Is it important to make notes in Class 12 Biology?

Yes, it is important to make notes in Biology, as the concepts it contains are very vast. These concepts cannot be remembered just by reading the chapter. You cannot retain what you read in the beginning till your examination. That is why notes play a major role in your preparation. By making notes, you can be confident about your preparation. These notes will be helpful for you in the long run as the concepts get extended in future degrees so you can have the basics with you always.

7. Is Class 12 Biology a tough subject?

It depends on your preparation. If you have prepared well then it will not bother you, but if you’ve not prepared then you will struggle writing answers. Though being a theory subject, Biology is fact-based. You cannot write anything on your own. Biology is a mixture of diagrams, theories, and facts. It also has rules, similar to Physics or Chemistry. The best way to learn Biology concepts is to read the NCERT textbook and material that is provided on Vedantu, as everything is written in an easy language.

8. How many chapters have been covered in the NCERT solutions for class 12 Biology?

The NCERT book for class 12 Biology prescribed by CBSE consists of a total of 16 chapters. Talk about various concepts in detail like reproduction, genetics, evolution, environmental issues, and biotechnology, etc. The NCERT Solutions for Class 12 Biology provided by Vedantu cover all 16 chapters with well-explained answers, revision notes, and a list of important questions as well. Students can find the NCERT Solutions for Class 12 Biology here.