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CBSE Class 12 Biology Sample Paper 2019

Oct 28, 2018 18:45 IST
    CBSE Class 12 Biology Sample Paper 2019
    CBSE Class 12 Biology Sample Paper 2019

    Check CBSE Sample Paper 2019 for Class 12 Biology Board Exam. Answers and Marking Scheme of this sample paper are also available with it. CBSE has recently published Class 12 Biology Sample Paper for the students preparing for CBSE Board Exam 2019.

    With this Sample Paper, students can easily understand the exam pattern, the difficulty level of the questions and scheme of choices which are expected in CBSE Class 12 Biology Board Exam 2019.

    CBSE board releases sample papers for classes 12th & 10th few months before the board exams. With these CBSE sample papers, students get an idea about the latest examination pattern and level of questions in the upcoming CBSE board exams.

    This Sample Paper is based on the latest CBSE Syllabus, and all the questions are important for upcoming board exam preparation.

    Preview: CBSE 12th Biology Sample Paper 2019

    • Maximum Marks: 70

    • Time: 3 Hours

    General Instructions:

    1. All questions are compulsory.

    2. The question paper consists of four sections A, B, C and D.

    3. Internal choice is given in all the sections. A student has to attempt only one of the alternatives in such questions.

    4. Section–A contains 5 questions of 1 mark each.

    5. Section–B has 7 questions of 2 marks each.

    6. Section–C is of 12 questions of 3 marks each

    7. Section–D has 3 questions of 5 marks each.

    8. Wherever necessary, the diagrams drawn should be neat and properly labelled.

    Section- A

    Question1.

    How many pollen grains and ovules are likely to be formed in the anther and the ovary of an angiosperm bearing 25 microspore mother cells and 25 megaspore mother cells respectively?

    Solution1.

    Microspore mother cells 25 x 4=100 pollen grains and from megaspore mother cells 25 ovules respectively. [½ + ½ a mark each]

    OR

    Question1.

    In case of polyembryony, an embryo A develops from the synergids and the embryo B develops from the nucellus. State the ploidy of embryo A and B.

    Solution1.

    A-Haploid; B-Diploid [½ + ½ a mark each]

    Question2.

    Give the scientific name of the source organism from which the first antibiotic was produced.

    Solution2.

    Penicillium notatum. [1]

    Question3.

    The prophase I stage of meiosis plays a vital role in r-DNA formation. Justify with reason.

    Solution3.

    The prophase I stage of meiosis plays vital role in r-DNA formation because crossing over occurs at this stage which helps in recombination. [1]

    Question4.

    Name the technique by which Gene expression can be controlled with the help of RNA molecule.

    Solution4.

    RNA interference [1]

    Question5.

    Define Diapause

    Solution5.

    Diapause is a stage of suspended development in zooplanktons species under unfavourable conditions. [1]

    OR

    Question5.

    Define Standing Crop

    Solution5.

    Each trophic level has a certain mass of living material at a particular time called as the standing crop. [½ + ½ mark]

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    All the questions are available in PDF of CBSE 12th Biology Sample Paper 2019.

    Download CBSE Sample Paper 2019 for Class 12 Biology

    Download Solutions of this Sample Paper (with Marking Scheme)

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