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CBSE Class 12 Biology Syllabus 2024- Download PDF Here

CBSE Class 12 Biology Syllabus 2024- Download PDF Here

Edited By Shamshad Ali | Updated on Apr 02, 2024 05:37 PM IST | #CBSE Class 12th

The Central Board of Secondary Education has released the CBSE biology class 12 syllabus 2024-25. Students can download the latest CBSE class 12 biology syllabus PDF using the link provided below. Also, they can access the CBSE 12th biology syllabus 2024-25 from the official website,
Download: CBSE Biology Class 12 Syllabus 2024-25 PDF

The 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 CBSE Class 12 Biology Syllabus 2024-25. The syllabus is available in PDF format, which students can refer to while for preparing for the CBSE 12th exams.

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Students will be able to check all the important and high-weightage topics from the syllabus of biology class 12 and prepare accordingly for the CBSE Board exams 2024-25. The CBSE Class 12 Biology Syllabus 2024-25 is also useful while preparing for the competitive exams. Read the complete article to know the detailed CBSE Class 12 syllabus 2024-25 for biology, marking scheme, steps to download PDF, preparation tips and more.

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Also, Check - NCERT Solutions for Class 12 Biology

CBSE Biology Class 12 Syllabus 2024-25

There are a total of 5 units in the syllabus of Biology. The theory papers consist of 70 marks and practical exams will be of 30 marks.

Genetics and Evolution20
Biology and Human Welfare12
Biotechnology and its Applications12
Ecology and Environment10

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Important Topics of CBSE Class 12th Biology Syllabus 2024-25

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 NoChapter NoParticulars
Unit-VI ReproductionChapter 2: Sexual Reproduction in Flowering PlantsFlower structure; development of male and female gametophytes; pollination - types, agencies and examples; out breeding devices; pollen-pistil interaction; double fertilization; post-fertilization 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 ReproductionMale 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 HealthNeed 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 EvolutionChapter-5: Principles of Inheritance and VariationHeredity 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 InheritanceSearch 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: EvolutionOrigin 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 WelfareChapter-8: Human Health and DiseasesPathogens; 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 WelfareMicrobes in food processing, industrial production, sewage treatment, energy generation and microbes as bio-control agents and bio-fertilizers. Antibiotics; production and judicious use.
Unit-IX Biotechnology and its ApplicationsChapter-11: Biotechnology - Principles and ProcessesGenetic Engineering (Recombinant DNA Technology).
Chapter-12: Biotechnology and its ApplicationsApplication 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 EnvironmentChapter-13: Organisms and PopulationsPopulation 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: EcosystemEcosystems: Patterns, components; productivity and decomposition; energy flow; pyramids of number, biomass, energy (Topics excluded: Ecological Succession and Nutrient Cycles)
Chapter-15: Biodiversity and its ConservationBiodiversity- 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 2024-25 for Practical


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How to Download CBSE Class 12 Biology Syllabus PDF 2024-25?

Follow the steps given below to download the CBSE 12th syllabus for Biology 2024-25 from the official website:

  • Go to the official website,
  • 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 2024-25 will be displayed on your screens. Save the syllabus in PDF format.

Also, Read - CBSE Class 12 Preparation Tips for Chemistry

Prescribed Books for CBSE Class 12 Bio Syllabus

CBSE prescribed NCERT Books for Class 12 Biology to complete the CBSE Class 12 Biology Syllabus 2024-25. 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:

  1. Biology, Class-XII, Published by NCERT
  2. Other related books and manuals brought out by NCERT (including multimedia)
  3. Biology Supplementary Material (Revised). available on CBSE website.

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CBSE Class 12 Biology Preparation Tips 2024-25

While preparing for the CBSE Class 12th, students must implement some simple but effective tips and tricks to score well in the same. Coming to Biology, it is a subject which will help you score very well in case 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 2024-25 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 2024-25, 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 other subject-wise tips

Frequently Asked Question (FAQs)

1. What are the passing marks in CBSE Class 12th exams?

Students must score at least 33 per cent marks per subject in order to pass the CBSE Class 12 exams.

2. Where can I get the solution of topics given in CBSE 12th Biology syllabus?

Students can access topic-wise solutions using the links available on this page. 

3. Is NCERT book enough to prepare for the exams?

Yes, NCERT books are enough to prepare for the exams and cover CBSE class 12 Biology syllabus 2024-25.

4. Where does the board release the CBSE board exam schedule?

The CBSE 12th exam dates and CBSE 10th time table are released by CBSE through its official website,


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Questions related to CBSE Class 12th

Have a question related to CBSE Class 12th ?

Here are some options you can explore to get admission in a good school even though admissions might be closed for many:

  • Waitlist: Many schools maintain waitlists after their initial application rounds close.  If a student who secured a seat decides not to join, the school might reach out to students on the waitlist.  So, even if the application deadline has passed,  it might be worth inquiring with schools you're interested in if they have a waitlist and if they would consider adding you to it.

  • Schools with ongoing admissions: Some schools, due to transfers or other reasons, might still have seats available even after the main admission rush.  Reach out to the schools directly to see if they have any open seats in 10th grade.

  • Consider other good schools: There might be other schools in your area that have a good reputation but weren't on your initial list. Research these schools and see if they have any seats available.

  • Focus on excelling in your current school: If you can't find a new school this year, focus on doing well in your current school. Maintain good grades and get involved in extracurricular activities. This will strengthen your application for next year if you decide to try transferring again.

Best CBSE schools in Delhi: Click Here

In India, the design and coding fields offer exciting career options that can leverage your interest in both. Here's how you can navigate this path:

Choosing Your Stream:

  • Graphic Design Focus: Consider a Bachelor's degree in Graphic Design or a design diploma. Build a strong portfolio showcasing your creative skills. Learn the basics of HTML, CSS, and JavaScript to understand web development better. Many online resources and bootcamps offer these introductory courses.

  • Coding Focus: Pursue a Computer Science degree or a coding bootcamp in India. These programs are intensive but can equip you with strong coding skills quickly. While building your coding prowess, take online courses in graphic design principles and UI/UX design.

Engineering Subjects (for a Degree):

  • Information Technology (IT): This offers a good mix of web development, networking, and database management, all valuable for web design/development roles.

  • Human-Computer Interaction (HCI): This is a specialized field that bridges the gap between design and computer science, focusing on how users interact with technology. It's a perfect choice if you're interested in both aspects.

  • Passing NIOS in October 2024 will make you eligible for NIT admissions in 2025 . NIT admissions are based on your performance in entrance exams like JEE Main, which typically happen in January and April. These exams consider the previous year's Class 12th board results (or equivalent exams like NIOS).

Here's why 2025 is more likely:

  • JEE Main 2024 Admissions: The application process for NITs through JEE Main 2024 is likely complete by now (May 2024). They consider your 2023 Class 12th marks (CBSE in this case).
  • NIOS Results: Since NIOS results typically come out after the NIT admission process, your October 2024 NIOS marks wouldn't be available for JEE Main 2024.

Looking Ahead (2025 Admissions):

  • Focus on JEE Main: Since you have a computer science background, focus on preparing for JEE Main 2025. This exam tests your knowledge in Physics, Chemistry, and Mathematics, crucial for engineering programs at NITs.
  • NIOS Preparation: Utilize the time between now and October 2024 to prepare for your NIOS exams.
  • Eligibility Criteria: Remember, NITs typically require a minimum of 75% marks in Class 12th (or equivalent) for general category students (65% for SC/ST). Ensure you meet this criteria in your NIOS exams.

Yes, scoring above 99.9 percentile in CAT significantly increases your chances of getting a call from IIM Bangalore,  with your academic background. Here's why:

  • High CAT Score: A score exceeding  99.9 percentile is exceptional and puts you amongst the top candidates vying for admission. IIM Bangalore prioritizes  CAT scores heavily in the shortlisting process.

  • Strong Academics: Your 96% in CBSE 12th and a B.Tech degree demonstrate a solid academic foundation, which IIM Bangalore also considers during shortlisting.

However, the shortlisting process is multifaceted:

  • Other Factors: IIM Bangalore considers other factors beyond CAT scores, such as your work experience (if any), XAT score (if you appear for it), academic diversity, gender diversity, and performance in the interview and Written Ability Test (WAT) stages (if shortlisted).

Here's what you can do to strengthen your application:

  • Focus on WAT and PI: If you receive a shortlist, prepare extensively for the Written Ability Test (WAT) and Personal Interview (PI). These stages assess your communication, soft skills, leadership potential, and suitability for the program.

  • Work Experience (if applicable): If you have work experience, highlight your achievements and how they align with your chosen IIM Bangalore program.

Overall, with a stellar CAT score and a strong academic background, you have a very good chance of getting a call from IIM Bangalore. But remember to prepare comprehensively for the other stages of the selection process.


Yes you can appear for the compartment paper again since CBSE gives three chances to a candidate to clear his/her exams so you still have two more attempts. However, you can appear for your improvement paper for all subjects but you cannot appear for the ones in which you have failed.

I hope this was helpful!

Good Luck

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5) During a trekking activity of 6km a student Ram will go to Sangam and return back up to 12 noon. He estimates that he can go to the Sangam at 1.5km/h on average, and return at half of that speed. These speeds take into account breaks and rest times. Using Ram's estimated speeds, what is the latest time he can begin his walk so that he can return by 12 noon?

A force of F = 70 N is applied on a block of mass M = 10 Kg placed on a horizonatl surface as shown in the figure . What will be the work done by frictional force in t = 2 sec if block was initially at rest

A police jeep on a petrol duty on national highway was moving with a speed of 54km/hr. in the same direction. It finds a thief rushing up in a car at a rate of 126km/hr in the same direction. Police sub – inspector fired at the car of the thief with his service revolver with a muzzle speed of 100m/s. with what speed will the bullet hit the car of thief? CLASS - XI PHYSICS (Kinematics)

(a) State the reasons for which Hershey and Chase carried out their experiments.
(b) Answer the following questions based on the experiments of Hershey and Chase :
(i) Name the different radioactive isotopes they used, and explain how they used them.
(ii) Why did they need to agitate and spin their culture ?
(iii) Write their observations and the conclusions they arrived at.





A student holding a mirror in his hand, directed the reflecting surface of the mirror towards the Sun. He then directed the reflected light on to a sheet of paper held close to the mirror.

(a) What should he do to burn the paper ?

(b) Which type of mirror does he have ?

(c) Will he be able to determine the approximate value of focal length of this mirror from this activity ? Give reason and draw ray diagram to justify your answer in this case. 





A student while observing an embryo of a pen seed in the laboratory listed various parts of the embryo as given below : 

Testa, tegmen, radicle, Plumule, micropyle, cotyledon


On examining the list the teacher remarked that only three parts are correct. Select three correct parts from the above list

a) tests, Radicle, cotyledons    b) Tegmen, Radicle, Microphyle

c) cotyledons, plumule, Testa    d) Radicel, cotyledons, plumule





An amorphous solid “A” burns in air to form a gas “B” which turns lime water milky. The gas is also produced as a by-product during roasting of sulphide ore. This gas decolourises acidified aqueous KMnO4 solution and reduces Fe3+ to Fe2+. Identify the solid “A” and the gas “B” and write the reactions involved.


Describe the structure of seminiferous tubules?? 

Differentiate 2021 with respect yo x


How many of the following points satisfy the inequality 2x-3y≤ -5?

A.  (0, -1)

B. (0, 1)

C. (-4, 0)

D. (4, 0)

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