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12th Standard Botany - Plant Breeding English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021

12th Standard

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Botany

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

    Answer all the questions

    10 x 1 = 10
  1. While studying the history of domestication of various cultivated plants _______ were recognized earlier

    (a)

    Centres of origin

    (b)

    Centres of domestication

    (c)

    Centres of hybrid

    (d)

    Centres of variation

  2. Match Column I with Column II

    Column I Column II
    i) William S. Gaud I) Heterosis
    ii) Shull II) Mutation breeding
    iii) Cotton Mather III) Green revolution
    iv) Muller and Stadler IV) Natural hybridization
    (a)
    i ii iii iv
    I II III IV
    (b)
    i ii iii iv
    III I IV II
    (c)
    i ii iii iv
    IV II I IV
    (d)
    i ii iii iv
    II IV III I
  3. Desired improved variety of economically useful crops are raised by _______.

    (a)

    Natural Selection

    (b)

    hybridization

    (c)

    mutation

    (d)

    biofertilisers

  4. Which one of the following crop varieties correct matches with its resistance to a disease?

    (a)
    Variety Resistance to disease
    Pusa Komal Bacterial blight
    (b)
    Variety Resistance to disease
    Pusa Sadabahar White rust
    (c)
    Variety Resistance to disease
    Pusa Shubhra Chilli mosaic virus
    (d)
    Variety Resistance to disease
    Brassica Pusa swarnim
  5. Which of the following scientist developed world's first cotton hybrid?

    (a)

    Dr. B.P. Pal

    (b)

    C.T. Patel

    (c)

    Dr. K. Ramiah

    (d)

    N.G.P. Rao

  6. Azolla is best suited biofertilizer for _________

    (a)

    Sugar cane cultivation

    (b)

    Paddy cultivation

    (c)

    Wheat cultivation

    (d)

    Cotton cultivation

  7. Assertion (A): Pure line varieties show homozygosity.
    Reason (R): Pure line species are obtained through cross-pollination.

    (a)

    Both A and R are true. R explains A.

    (b)

    A is true R is false

    (c)

    A is false R is true

    (d)

    Both A and R are false

  8. Identify the proper sequence of hybridisation technique

    (a)

    Emasculation ⟶ Selection ⟶ Bagging ⟶ Crossing ⟶ Harvesting

    (b)

    Harvesting ⟶ Selection ⟶ Crossing ⟶ Emasculation ⟶ Bagging

    (c)

    Selection ⟶ Harvesting ⟶ Crossing ⟶ Emasculation ⟶ Bagging

    (d)

    Selection ⟶ Emasculation ⟶ Bagging ⟶ Crossing ⟶ Harvesting

  9. Raphanobrassica is an example for____________

    (a)

    Autopolyploid

    (b)

    Allopolyploid

    (c)

    Polyploid

    (d)

    Polysomy

  10. Pusa Sawani variety of okra is resistant against __________

    (a)

    Aphids

    (b)

    Fruit borers

    (c)

    Shoot and fruit borers

    (d)

    Jassids

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