CBSE Class 12 Biology Syllabus 2025-26 (Released PDF) – Download Latest Curriculum & Marking Scheme
Upcoming Event
CBSE Class 12th Exam Date:01 Jan' 26 - 14 Feb' 26
The Central Board of Secondary Education has released the latest CBSE Biology Class 12 syllabus 2025-26. Students can download the latest CBSE Class 12 Biology syllabus PDF 2025-26 using the link provided below or they can visit the official website at cbseacademic.nic.in. This year, the board has not reduced the CBSE 12th syllabus 2025-26. The CBSE 12th exam is expected to be held from February 17 to April 4, 2026. Students are advised to complete the syllabus at least a month before the exam to save enough time for revisions and practice.
Download: CBSE Biology Class 12 Syllabus 2025-26 PDF
This Story also Contains
- CBSE 12th Syllabus 2025-26
- CBSE Biology Class 12 Syllabus 2025-26
- Important Topics of CBSE Class 12th Biology Syllabus 2025-26
- CBSE Class 12 Biology Syllabus 2025-26 for Practical
- Prescribed Books for CBSE Class 12 Bio Syllabus 2025-26
- CBSE Class 12 Biology Preparation Tips 2025-26
The 2025-26 biology syllabus Class 12 CBSE consists of all the units, chapters, and topics for the theory exam, along with the details of the practicals. Students can check the mark allotted for each unit in the CBSE Class 12 Biology Syllabus 2025-26. There are a total of 5 units in the CBSE biology syllabus for class 12th. We have provided detailed information below in this article. Students can refer to it while preparing for the CBSE 12th exams.
Students can also check all the important and high-weightage topics from the syllabus of biology class 12 and prepare accordingly for the CBSE Board exams 2025-26. The CBSE Class 12 Biology Syllabus 2025-26 is also useful while preparing for the competitive exams. Read the complete article to know the detailed CBSE Class 12 syllabus 2025-26 for biology, marking scheme, steps to download PDF, preparation tips and more.
CBSE 12th Syllabus 2025-26
The CBSE Class 12 syllabus 2025-26 is very important for students; they should try to understand the syllabus in depth. It will help them make strategies to ace their exams.
- CBSE Class 12 Maths Syllabus 2025-26
- CBSE Class 12 Physics Syllabus 2025-26
- CBSE Class 12 Chemistry Syllabus 2025-26
CBSE 12 Class Free Mock Test
Boost your exam preparation with our CBSE 12 Class Free Mock Test, designed as per the latest exam pattern.
Attempt NowCBSE Biology Class 12 Syllabus 2025-26
There are no changes in the CBSE Biology syllabus class 12th. There are a total of 5 units in the syllabus of Biology. The theory papers consist of 70 marks, and the practical exams will be of 30 marks.
| Units | Topics | Marks |
|---|---|---|
| Unit 6 | Reproduction | 16 |
| Unit 7 | Genetics and Evolution | 20 |
| Unit 8 | Biology and Human Welfare | 12 |
| Unit 9 | Biotechnology and Its Applications | 12 |
| Unit 10 | Ecology and Environment | 10 |
| Total | 70 |
Important Topics of CBSE Class 12th Biology Syllabus 2025-26
The chapters incorporated in each unit are given in the table below for the convenience of students. For a detailed CBSE class 12 bio syllabus, students can download the PDF file using the link given above.
| Unit No | Chapter No | Particulars |
|---|---|---|
| Unit-VI Reproduction | Chapter 2: Sexual Reproduction in Flowering Plants | Flower structure; development of male and female gametophytes; pollination - types, agencies and examples; outbreeding devices; pollen-pistil interaction; double fertilisation; post-fertilisation events - development of endosperm and embryo, development of seed and formation of fruit; special modes- apomixis, parthenocarpy, polyembryony; Significance of seed dispersal and fruit formation. |
| Chapter 3: Human Reproduction | Male and female reproductive systems; microscopic anatomy of testis and ovary; gametogenesis -spermatogenesis and oogenesis; menstrual cycle; fertilisation, embryo development up to blastocyst formation, implantation; pregnancy and placenta formation (elementary idea); parturition (elementary idea); lactation (elementary idea). | |
| Chapter 4: Reproductive Health | Need for reproductive health and prevention of Sexually Transmitted Diseases (STDs); birth control - need and methods, contraception and medical termination of pregnancy (MTP); amniocentesis; infertility and assisted reproductive technologies - IVF, ZIFT, GIFT (elementary idea for general awareness). | |
| Unit-VII Genetics and Evolution | Chapter 5: Principles of Inheritance and Variation | Heredity and variation: Mendelian inheritance; deviations from Mendelism – incomplete dominance, co-dominance, multiple alleles and inheritance of blood groups, pleiotropy; elementary idea of polygenic inheritance; chromosome theory of inheritance; chromosomes and genes; Sex determination - in humans, birds and honey bee; linkage and crossing over; sex linked inheritance - haemophilia, colour blindness; Mendelian disorders in humans - thalassemia; chromosomal disorders in humans; Down's syndrome, Turner's and Klinefelter's syndromes. |
| Chapter 6: Molecular Basis of Inheritance | Search for genetic material and DNA as genetic material; Structure of DNA and RNA; DNA packaging; DNA replication; Central Dogma; transcription, genetic code, translation; gene expression and regulation - lac operon; Genome, Human and rice genome projects; DNA fingerprinting. | |
| Chapter-7: Evolution | Origin of life; biological evolution and evidences for biological evolution (paleontology, comparative anatomy, embryology and molecular evidence); Darwin's contribution, modern synthetic theory of evolution; mechanism of evolution - variation (mutation and recombination) and natural selection with examples, types of natural selection; Gene flow and genetic drift; Hardy - Weinberg's principle; adaptive radiation; human evolution. | |
| Unit-VIII Biology and Human Welfare | Chapter 8: Human Health and Diseases | Pathogens; parasites causing human diseases (malaria, dengue, chikungunya, filariasis, ascariasis, typhoid, pneumonia, common cold, amoebiasis, ring worm) and their control; Basic concepts of immunology - vaccines; cancer, HIV and AIDS; Adolescence - drug and alcohol abuse. |
| Chapter 10: Microbes in Human Welfare | Microbes in food processing, industrial production, sewage treatment, energy generation and microbes as bio-control agents and bio-fertilisers. Antibiotics: production and judicious use. | |
| Unit-IX Biotechnology and its Applications | Chapter-11: Biotechnology - Principles and Processes | Genetic Engineering (Recombinant DNA Technology). |
| Chapter 12: Biotechnology and its Applications | Application of biotechnology in health and agriculture: Human insulin and vaccine production, stem cell technology, gene therapy; genetically modified organisms - Bt crops; transgenic animals; biosafety issues, biopiracy and patents. | |
| Unit-X Ecology and Environment | Chapter 13: Organisms and Populations | Population interactions - mutualism, competition, predation, parasitism; population attributes - growth, birth rate and death rate, age distribution. (Topics excluded: Organism and its Environment, Major Abiotic Factors, Responses to Abiotic Factors, Adaptations) |
| Chapter-14: Ecosystem | Ecosystems: Patterns, components; productivity and decomposition; energy flow; pyramids of number, biomass, energy (Topics excluded: Ecological Succession and Nutrient Cycles) | |
| Chapter 15: Biodiversity and its Conservation | Biodiversity- concept, patterns, importance; loss of biodiversity; biodiversity conservation; hotspots, endangered organisms, extinction, Red Data Book, Sacred Groves, biosphere reserves, national parks, wildlife, sanctuaries and Ramsar sites. |
CBSE Class 12 Biology Syllabus 2025-26 for Practical
How to Download CBSE Class 12 Biology Syllabus PDF 2025-26?
Follow the steps given below to download the CBSE 12th syllabus for Biology 2025-26 from the official website:
- Go to the official website, cbseacademic.nic.in.
- On the home page, click on the ‘Curriculum’ option.
- Click on the ‘Senior Secondary Curriculum (XI-XII)’.
- Select Academic Electives - (Group-A).
- Now click on the Biology tab. The Biology syllabus class 12 CBSE 2025-26 will be displayed on your screens. Save the syllabus in PDF format.
CBSE Class 12th Syllabus: Subjects & Chapters
Select your preferred subject to view the chapters
Prescribed Books for CBSE Class 12 Bio Syllabus 2025-26
CBSE prescribed NCERT Books for Class 12 Biology to complete the CBSE Class 12 Biology Syllabus 2025-26. It is important to refer to the NCERT book as it covers the entire syllabus in a simple and easily understandable language. Relevant diagrams are also provided with each topic for better understanding. Below is the list of prescribed books by CBSE:
- Biology, Class-XII, Published by NCERT
- Other related books and manuals brought out by NCERT (including multimedia)
- Biology Supplementary Material (Revised). available on CBSE website.
CBSE Class 12 Biology Preparation Tips 2025-26
While preparing for the CBSE Class 12th, students must implement some simple but effective tips and tricks to score well in the same. Biology is a subject that will help you score very well if you take it seriously and give your best. Go through some of the best preparation tips for CBSE 12th Biology:
- Complete the CBSE Class 12 Biology syllabus 2025-26 as soon as possible so that you can give maximum time for revision.
- Students must refer to the CBSE class 12 time table and plan their studies accordingly.
- Do not mug up the theories of Biology, instead, try to understand the meaning of the same and make personal notes. These notes will help you to revise at the last moment.
- After completing the CBSE Class 12 Biology Syllabus 2025-26, students must solve the CBSE Class 12 question papers. This will help them to know the exam pattern, marking scheme and important topics.
- Dedicate maximum time for the revision and do not ignore any doubts. Clear them right away. Seek help from others in case of confusion. Also, do not stress about the board, instead, give your best and score well in CBSE Class 12 result .
Also, Read:
Frequently Asked Questions (FAQs)
Q: Where can I get the solution of topics given in CBSE 12th Biology syllabus?
A:
Students can access topic-wise solutions using the links available on this page.
Q: Is NCERT book enough to prepare for the exams?
A:
Yes, NCERT books are enough to prepare for the exams and cover the CBSE class 12 Biology syllabus 2025-26.
Q: Where does the board release the CBSE board exam schedule?
A:
The CBSE 12th exam dates and CBSE 10th time table are released by CBSE through its official website, cbse.gov.in.
Q: What are the passing marks in CBSE Class 12th exams?
A:
Students must score at least 33 per cent marks per subject in order to pass the CBSE Class 12 exams.
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Questions related to CBSE Class 12th
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Hello,
You can get the Class 11 English Syllabus 2025-26 from the Careers360 website. This resource also provides details about exam dates, previous year papers, exam paper analysis, exam patterns, preparation tips and many more. you search in this site or you can ask question we will provide you the direct link to your query.
LINK: https://school.careers360.com/boards/cbse/cbse-class-11-english-syllabus
Hello,
No, it’s not true that GSEB (Gujarat Board) students get first preference in college admissions.
Your daughter can continue with CBSE, as all recognized boards CBSE, ICSE, and State Boards (like GSEB) which are equally accepted for college admissions across India.
However, state quota seats in Gujarat colleges (like medical or engineering) may give slight preference to GSEB students for state-level counselling, not for all courses.
So, keep her in CBSE unless she plans to apply only under Gujarat state quota. For national-level exams like JEE or NEET, CBSE is equally valid and widely preferred.
Hope it helps.
Hello,
The Central Board of Secondary Education (CBSE) releases the previous year's question papers for Class 12.
You can download these CBSE Class 12 previous year question papers from this link : CBSE Class 12 previous year question papers (http://CBSE%20Class%2012%20previous%20year%20question%20papers)
Hope it helps !
Hi dear candidate,
On our official website, you can download the class 12th practice question paper for all the commerce subjects (accountancy, economics, business studies and English) in PDF format with solutions as well.
Kindly refer to the link attached below to download:
CBSE Class 12 Accountancy Question Paper 2025
CBSE Class 12 Economics Sample Paper 2025-26 Out! Download 12th Economics SQP and MS PDF
CBSE Class 12 Business Studies Question Paper 2025
CBSE Class 12 English Sample Papers 2025-26 Out – Download PDF, Marking Scheme
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Hello,
Since you have passed 10th and 12th from Delhi and your residency is Delhi, but your domicile is UP, here’s how NEET counselling works:
1. Counselling Eligibility: For UP NEET counselling, your UP domicile makes you eligible, regardless of where your schooling was. You can participate in UP state counselling according to your NEET rank.
2. Delhi Counselling: For Delhi state quota, usually 10th/12th + residency matters. Since your school and residency are in Delhi, you might also be eligible for Delhi state quota, but it depends on specific state rules.
So, having a Delhi Aadhaar will not automatically reject you in UP counselling as long as you have a UP domicile certificate.
Hope you understand.
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