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12th Standard Biology English Medium Free Online Test Book Back One Mark Questions - Part Two

12th Standard

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Biology

Time : 00:10:00 Hrs
Total Marks : 10

    Answer all the questions

    10 x 1 = 10
  1. Assertion and reasoning questions:
    In each of the following questions there are two statements. One is assertion (A) and other is reasoning (R). Mark the correct answer as
    Assertion: Offsprings produced by asexual reproduction are genetically identical to the parent.
    Reason: Asexual reproduction involves only mitosis and no meiosis

    (a)

    both A and R are true and R is correct explanation for A

    (b)

    If both A and R are true but R is not the correct explanation for A

    (c)

    If A is true but R is false

    (d)

    If both A and R are false.

  2. Find the wrongly matched pair

    (a)

    Bleeding phase- fall in oestrogen and progesterone

    (b)

    Follicular phase-rise in oestrogen

    (c)

    Luteal phase - rise in FSH level

    (d)

    Ovulatory phase - LH surge

  3. Match column I with column II and select the correct option from the codes given below.

    Column I Column II
    A. Copper releasing IUD (i) LNG-20
    B. Hormone releasing (ii) Lippes loop IUD
    C. Non medicated IUD (iii) Saheli
    D. Mini pills (iv) Multiload-375
    (a)

    A-(iv), B-(ii), C-(i), D-(iii)

    (b)

    A-(iv), B-(i), C-(iii), D-(ii)

    (c)

    A-(i), B-(iv), C-(ii), D-(iii)

    (d)

    A-(iv), B-(i), C-(ii), D-(iii)

  4. Pataus’ syndrome is also referred to as

    (a)

    13-Trisomy

    (b)

    18-Trisormy

    (c)

    21-Trisormy

    (d)

    None of these

  5. Meselson and Stahl’s experiment proved

    (a)

    Transduction

    (b)

    Transformation

    (c)

    DNA is the genetic material

    (d)

    Semi-conservative nature of DNA replication

  6. Which period was called “Age of fishes”?

    (a)

    Permian

    (b)

    Triassic

    (c)

    Devonian

    (d)

    Ordovician

  7. Cyclosporin – A is an immunosuppressive drug produced from _______

    (a)

    Aspergillus niger

    (b)

    Manascus purpureus

    (c)

    Penicillium notatum

    (d)

    Trichoderma polysporum

  8. Competition between species leads to

    (a)

    Extinction

    (b)

    Mutation

    (c)

    Amensalism

    (d)

    Symbiosis

  9. Which of the following forests is known as the lungs of the planet earth?

    (a)

    Tundra forest

    (b)

    Rain forest of north east India

    (c)

    Taiga forest

    (d)

    Amazon rain forest

  10. Identify the incorrect pair

    (a)

    sporopollenin - exine of pollen grain

    (b)

    tapetum – nutritive tissue for developing microspores

    (c)

    Nucellus – nutritive tissue for developing embryo

    (d)

    obturator – directs the pollen tube into micropyle

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