Careers360 Logo

Popular Searches

    Exam Prep

    CBSE Class 12 Biology: Marks Allotted To Important Topics, Paper Pattern, Theory And Practicals

    By Irshad Anwar
    9 Dec'22  4 min read
    CBSE Class 12 Biology: Marks Allotted To Important Topics, Paper Pattern, Theory And Practicals
    Synopsis

    Biology is an interesting subject which can be prepared well. With a little hard work and a goal oriented study plan, you can definitely get a high score. As you prepare for your Boards or for upcoming NEET, Careers360 gives you all the tips of important units you must focus on based on their weightage in the board exams.  

    CBSE Class 12 Biology: Marks Allotted To Important Topics, Paper Pattern, Theory And Practicals
    Synopsis

    Biology is an interesting subject which can be prepared well. With a little hard work and a goal oriented study plan, you can definitely get a high score. As you prepare for your Boards or for upcoming NEET, Careers360 gives you all the tips of important units you must focus on based on their weightage in the board exams.  

    For students preparing to get into their dream colleges, the CBSE class 12 board exam serves as a stepping stone. Therefore, students must make the most of every second of this time to effectively prepare for their upcoming boards. Sincere commitment and effort combined with careful planning and focused effort, will help you to complete the well-researched syllabus. An achievable and goal oriented study plan is a must so that you can cover s syllabus in minimum time to score well. How to do it? Do not worry Careers360 is here to help you through these study preps.

    Let us look at the topic-wise biology weightage distribution for the board exam. So that you can plan your study accordingly. In the first instalment we will cover weightage distribution for theory and practicals, experiments that may be asked and question paper format. This will help you decide how much time you should spend on a particular unit.

    Class 12 (2022-23) - Biology (Theory)

    Time: 03 Hours

    Max. Marks: 70

    Unit

    Unit Name

    Marks

    VI

    Reproduction

    16

    VII

    Genetics and Evolution

    20

    VIII

    Biology and Human Welfare

    12

    IX

    Biotechnology and its Applications

    12

    X

    Ecology and Environment

    10


    Total

    70


    Class 12 Biology Practicals

    Time allowed: 3 Hours

    Max. Marks: 30

    Evaluation Scheme

    Marks

    One Major Experiment 5

    5

    One Minor Experiment 2 & 3

    4

    Slide Preparation 1& 4

    5

    Spotting

    7

    Practical Record + Viva Voce

    4

    Investigatory Project and its Project Record + Viva Voce

    5

    Total

    30

    *(Credit to a student's work throughout the academic session may be given for a practical record, an investigatory project, a project record, and a viva voce.)

    A. List of Experiments

    1. To observe pollen germination, prepare a temporary mount.

    2. Using the quadrat method, examine the plant population density.

    3. Study the plant population frequency using the quadrat method.

    4. Prepare a temporary mount of the onion root tip to study mitosis.

    5. Isolate DNA from available plant material such as spinach, green pea seeds, papaya, etc.

    B. Study and observe the following (Spotting):

    1. Flowers adapted to pollination by different agencies (wind, insects, birds).

    2. Pollen germination on stigma through a permanent slide or scanning electron micrograph.

    3. Identification of stages of gamete development, i.e., T.S. of testis and T.S. of ovary through permanent slides (from grasshopper/mice).

    4. Meiosis in onion bud cells or grasshopper testis through permanent slides.

    5. T.S. of blastula through permanent slides (Mammalian).

    6. Mendelian inheritance using seeds of different colours/sizes of any plant.

    7. Prepared pedigree charts of any one of the genetic traits such as rolling of tongue, blood groups, ear lobes, widow's peak and colour blindness.

    8. Controlled pollination - emasculation, tagging and bagging.

    9. Common disease-causing organisms like Ascaris, Entamoeba, Plasmodium, and any fungus-causing ringworm through permanent slides, models or virtual images or specimens. Comment on symptoms of diseases that they cause.

    10. Models specimen showing symbolic association in root modules of leguminous plants, Cuscuta on the host, lichens.

    11. Flashcards models showing examples of homologous and analogous organs.

    Top Weightage Class 12 Biology Topics

    Unit-VII Genetics and Evolution (20 marks)

    This unit carries 29 per cent of total theory marks. There are three chapters included in this unit.

    Chapter-5: Principles of Inheritance and Variation

    Chapter-6: Molecular Basis of Inheritance

    Chapter-7: Evolution

    Unit-VI Reproduction (16 marks)

    This is the second most important unit with 23 per cent of total theory marks. There are three chapters included in this unit.

    Chapter-2: Sexual Reproduction in Flowering Plants

    Chapter-3: Human Reproduction

    Chapter-4: Reproductive Health

    These two units together carry more than 50 per cent of weightage. If you are able to cover these units on priority, your half of the work is done. Other units can be focussed on later in this continuation according to the weightage or distribution of marks.

    CBSE Class 12 Biology Syllabus 2023: Question Paper Pattern and Format

    In order to adequately prepare for their CBSE Class 12 Exam 2023, the students can review the question paper format. Check out the table below:

    Competencies

    Percentage

    Demonstrate Knowledge and Understanding

    50%

    Application of Knowledge / Concepts

    30%

    Analyse, Evaluate, and Create

    20%

    Total

    100%


    Note:

    • Typology of questions: VSA including MCQs, Assertion – Reasoning type questions; SA; LAI; LA-II; Source-based/ Case-based/ Passage-based/ Integrated assessment questions.

    • There would be about a 33 per cent internal choice.

    Suggestive verbs for various competencies

    1. Demonstrate knowledge and understanding: State, name, list, identify, define, suggest, describe, outline, summarise, etc.

    2. Application of Concepts/ Knowledge: calculate, illustrate, adapt, show, explain, distinguish, etc.

    3. Analyse, Evaluate and Create: Interpret, analyse, compare, contrast, examine, evaluate, discuss, construct, etc.

    CBSE Class 12 Marking Scheme 2023

    Each subject on the CBSE Class 12 board exam requires a minimum score of 33 per cent in order to pass. In addition, the candidate must also secure at least 33 per cent aggregate marks to pass the board exam. Candidates who receive aggregate marks of 33 per cent or higher but less than 33 per cent in any subject are required to take the supplementary exam.

    CBSE Class 12 Biology Question Paper Design 2023

    Every question must be answered. The question paper is divided into five sections: Sections A, B, C, D, and E. There are 33 questions in the question paper.

    Sections

    No. of Questions

    Marks per Question

    Total Marks per Section

    A

    16

    1

    16

    B

    5

    2

    10

    C

    7

    3

    21

    D

    2 case-based questions

    4

    8

    E

    3

    5

    15

    Total

    33


    70


    The class 12 biology syllabus 2022–2023 has been published by the CBSE on their official website, cbseacademics.nic.in.

      Subscribe to Membership Plan

      *Unlock all premium content and benefits:
      Read more from Latest Stories

      Careers360 helping shape your Career for a better tomorrow

      student

      250M+

      Students

      colleges

      30,000+

      Colleges

      exams

      500+

      Exams

      ebook

      1500+

      E-Books

      Download Careers360 App's

      Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile

      • student
        250M+

        Students

      • colleges
        30,000+

        Colleges

      • exams
        500+

        Exams

      • ebook
        1500+

        E-Books

      • certification
        12000+

        Cetifications

      student
      Mobile Screen

      We Appeared in