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CBSE Class 12 Biology Board Exam 2018: Important diagrams from which questions are expected

Mar 14, 2018 14:56 IST
    CBSE Class 12 Biology: Important diagrams from NCERT textbook
    CBSE Class 12 Biology: Important diagrams from NCERT textbook

    Important diagrams for CBSE Class 12 Biology Board Exam 2018 are available here. Questions based on diagrams (given in Class 12 Biology NCERT textbooks) have been frequently asked in board exams, every year. This year, CBSE Class 12 Biology Board Exam 2018 is scheduled to be held on March 27, 2018.

    If you will go through latest Class 12 Biology Sample Paper (issued by CBSE), then you will find 5 questions (14 Marks) given in this paper are based on diagram and graphs given in NCERT textbooks.

    More details about diagram based questions (given in CBSE Class 12 Biology Sample Paper):

    Question 11 (3 Marks) – Section C

    Question 20 (3 Marks) – Section C

    Question 22 (3 Marks) – Section C

     Question 24 (5 Marks)  or Question 24 (5 Marks) – Section E

    Question11: Draw the diagram of microsporangium of an Angiosperm and label any four parts. State the function of its innermost wall layer.

    (3 Marks)

    Question20:  Given below is the diagram of agarose gel kept under UV light:

    CBSE Class 12 Biology Board Exam 2018: Important diagrams based questions expected in the paper

    (a) Mention the positive and negative terminals.

    (b) What is the charge carried by DNA molecule and how does it help in its separation?

    (c) How are the separated DNA fragments finally isolated?

    (3 Marks)

    CBSE Examination Pattern or Blue Print: Class 12 Biology Board Exam 2018

    Question22: The graph given below shows the distribution of biomes:

    (a) What do the ‘X’ and ‘Y’ axis represent?

    (b) Identify the ‘grassland’ and ‘coniferous forest’ biomes, from the above figure.

    (c) Why is ‘F’ located at the given position in the graph?

    (3 Marks)

    CBSE Class 12 Biology Board Exam 2018: Important questions

    Question24:

    Given below is the diagram of a human ovum surrounded by a few sperms. Observe the diagram and answer the following questions:

    (a) Compare the fate of sperms shown in the diagram.

    (b) What is the role of zona pellucid in this process?

    (c) Analyze the changes occurring in the ovum during the process.

    (d) How is the entry of sperm into the ovum facilitated?

    (e) Specify the region of female reproductive system where the event represented in the diagram takes place.

    (5 Marks)

    OR

    Question24:

    The graph given below shows the variation in the levels of ovarian hormones during various phases of menstrual cycle:

    (a) Identify ‘A’ and ‘B’.

    (b) Specify the source of the hormone marked in the diagram.

    (c) Reason out why A peaks before B.

    (d) Compare the role of A and B.

    (e) Under which condition will the level of B continue to remain high on the 28thday?

    (5 Marks)

    These diagrams (and questions) are very important for CBSE Class 12 Biology Board Exam 2018. 

    These questions also show that a major portion of CBSE Class 12 Biology 2018 board exam’ question paper will be related diagrams given in Class 12 Biology NCERT textbooks. So, we have gone through previous years’ papers of CBSE Class 12

    Considering the importance of diagrams in, here, we have mentioned some important topics from Class 12 Biology NCERT textbooks from which questions are expected in CBSE Class 12 Biology Board Exam 2018:

    Diagrammatic representation of L.S. of a Flower

    T.S. of an ovary

    Anatropous ovule

    Fertilisation of ovum

    Schematic structure of a transcription unit

    Simplified model of carbon cycle in the biosphere

    Diagrammatic representation of the experimental steps in cloning and expressing a human gene (say the gene for growth hormone) into a bacterium like E. coli

    Structure of some seeds

    Growth of pollen tube into pistil

    Deoxyribonucleic acid (DNA)

    Nucleosome

    Structure of antibody

    Seminiferous tubule

    Primary endosperm nucleus (PEN)

    Replication fork

    Mendelian Dihybrid Cross

    Carbon Cycle in Biosphere

    Diagrammatic representation of Miller’s experiment

    Sectional view of ovary

    Diagrammatic representation of the mature embryo sac

    Transport of ovum, fertilisation and passage of growing embryo through fallopian tube

    Stages in the life cycle of Plasmodium

    Diagrammatic representation of primary succession

    Stages in embryo development in a dicot

    Diagrammatic sectional view of female pelvis showing reproductive system

    L.S. of pistil showing path of pollen tube growth

    Other important articles related to CBSE Board Exams 2018:

    CBSE Solved Paper Class 12 Biology Board Exam 2017

    CBSE Solved Paper Class 12 Biology Board Exam 2016

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