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

12th Standard

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Biology

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

    Answer all the questions

    10 x 1 = 10
  1. Transgenic animals are those which have

    (a)

    Foreign DNA in some of their cells

    (b)

    Foreign DNA in all their cells

    (c)

    Foreign RNA in some of their cells

    (d)

    Foreign RNA in all their cells

  2. The point mutation sequence for transition, transition, transversion and transversion in DNA are

    (a)

    A to T, T to A, C to G and G to C

    (b)

    A to G, C to T, C to G and T to A

    (c)

    C to G, A to G, T to A and G to A

    (d)

    G to C, A to T, T to A and C to G

  3. Which of the following one is used as a Biosensors?

    (a)

    Electrophoresis

    (b)

    Bioreactors

    (c)

    Vectors

    (d)

    Electroporation

  4. Virus free plants are developed from

    (a)

    Organ culture

    (b)

    Meristem culture

    (c)

    Protoplast culture

    (d)

    Cell suspension culture

  5. A free living nitrogen fixing cyanobacterium which can also form symbiotic association with the water fern Azolla

    (a)

    Nostoc

    (b)

    Anabaena

    (c)

    chlorella

    (d)

    Rhizobium

  6. Which of the following ecosystem has the highest primary productivity?

    (a)

    Pond ecosystem

    (b)

    Lake ecosystem

    (c)

    Grassland ecosystem

    (d)

    Forest ecosystem

  7. One green house gas contributes 14% of total global warming and another contributes 6%. These are respectively identified as

    (a)

    N2O and CO2

    (b)

    CFCs and N2O

    (c)

    CH4 and CO2

    (d)

    CH4 and CFCS

  8. Progeny obtained as a result of repeat self pollination a cross pollinated crop to called

    (a)

    pure line

    (b)

    pedigree line

    (c)

    inbreed line

    (d)

    heterosis

  9. Consider the following statements and choose the right option.
    i) Cereals are members of grass family.
    ii) Most of the food grains come from monocotyledon.

    (a)

    (i) is correct and (ii) is wrong

    (b)

    Both (i) and (ii) are correct

    (c)

    (i) is wrong and (ii) is correct

    (d)

    Both (i) and (ii) are wrong

  10. Colostrum provides

    (a)

    Naturally acquired active immunity

    (b)

    Naturally acquired passive immunity

    (c)

    Artificially acquired active immunity

    (d)

    Artificially acquired passive immunity

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