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12th Standard Biology English Medium Plant Breeding Reduced Syllabus Important Questions 2021

12th Standard

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Biology

Time : 01:00:00 Hrs
Total Marks : 100

    Multiple Choice Questions

    16 x 1 = 16
  1. 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 – I, ii – II, iii – III, iv – IV

    (b)

    i – III, ii – I, iii – IV, iv – II

    (c)

    i – IV, ii – II, iii – I, iv – IV

    (d)

    i – II, ii – IV, iii – III, iv – I

  2. Importing better varieties and plants from outside and acclimatising them to local environment is called

    (a)

    cloning

    (b)

    heterosis

    (c)

    selection

    (d)

    introduction

  3. 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
  4. ________is the process of bringing a plant species under human control.

    (a)

    Emasculation

    (b)

    Hybridization

    (c)

    Domestication

    (d)

    Acclimatization

  5. Arbuscular mycorrhizae is a symbiotic association between ____________

    (a)

    Algae and fungi

    (b)

    Angiosperm roots and fungi

    (c)

    Blue-green algae and Azolla fern

    (d)

    Cyanobacteria and corolloid root

  6. Azolla is best suited biofertilizer for _________

    (a)

    Sugar cane cultivation

    (b)

    Paddy cultivation

    (c)

    Wheat cultivation

    (d)

    Cotton cultivation

  7. Assertion (A): SLF promotes vigorous growth and provide resistance against diseases.
    Reason (R): SLF is made from kelp containing more than 70 minerals.

    (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. Statement (1): Trichoderma species is a free-living bacteria.
    Statement (2): It acts as a potent bio-control agent

    (a)

    Statement 1 is correct and Statement 4 is incorrect

    (b)

    Statement 1 is incorrect and Statement 2 is correct

    (c)

    Both the statements are correct

    (d)

    Both the statements are incorrect

  9. Statement (1): Clonal selection is carried out in asexually propagating plants.
    Statement (2): Clones show similar genotypes.

    (a)

    Statement 1 is correct and Statement 2 is incorrect

    (b)

    Statement 1 is incorrect and Statement 2 is correct

    (c)

    Both the statements are correct

    (d)

    Both the statements are incorrect

  10. Superiority of hybrids over parents only in vegetative growth not in yield. This phenomenon is termed as ________

    (a)

    Euheterosis

    (b)

    Balanced euheterosis

    (c)

    Luxuriance

    (d)

    Mutational heterosis

  11. Who is popularly called as the "father of green revolution in India"?

    (a)

    Nel Jeyaraman

    (b)

    Dr. M.S. Swaminathan

    (c)

    Dr. Nammalvar

    (d)

    N.G.P. Rao

  12. Pusa swarnim variety of Brassica species show resistance to ___________

    (a)

    White rust

    (b)

    Leaf curl

    (c)

    Black rot

    (d)

    Hill bunt

  13. The first established Atomic Garden in India was _________

    (a)

    Bhabha Atomic Research Institute

    (b)

    Indira Gandhi Centre for Atomic Research

    (c)

    Indian Agricultural Research Institute

    (d)

    Bose Research Institute

  14. Atlas 66 is an improved variety of ____________

    (a)

    Rice

    (b)

    Maize

    (c)

    Wheat

    (d)

    Spinach

  15. Damping off of tomato is controlled by

    (a)

    Beauveria species

    (b)

    Trichoderma species

    (c)

    Acacia species

    (d)

    Pseudomonas species

  16. Atomita 2 - rice is a product by _________

    (a)

    Polyploid breeding

    (b)

    Hybridization

    (c)

    Mutation breeding

    (d)

    Clonal selection

  17. 2 Marks

    15 x 2 = 30
  18. How are microbial innoculants used to increase the soil fertility?

  19. Mention any two free-living nitrogen-fixing bacteria.

  20. What are bio-pesticides? Why they are considered better than synthetic pesticides?

  21. What is plant breeding?

  22. Define acclimatization.

  23. Who coined the term "pureline"? Define it.

  24. Define the following terms:
    (a) Emasculation (b) Bagging

  25. What is Heterosis?

  26. Mutagens are the substances that induces mutation. Name any two physical and chemical mutagens.

  27. Write in brief about Atomic Garden.

  28. State anyone advantage and one disadvantage of polyploid breeding.

  29. Name any two allopolyploid plant species

  30. What is Biofortification?

  31. Name the insect resistant varieties developed in the following crops.
    (a) Okra (b) Rapeseed mustard.

  32. In which plant, and by whom the first natural hybridization was performed?

  33. 3 Marks

    13 x 3 = 39
  34. What are the different types of hybridization?

  35. Name any three eminent plant breeders of Indian origin.

  36. How Rhizobium acts as an efficient bio- fertiIizer?

  37. Azolla increases the yield of paddy crop - support your answer.

  38. Mention any three advantages of Arbuscular mycorrhizal association.

  39. What makes the Trichoderma an effective bio-pesticide?

  40. Write a note on Green Manuring.

  41. Point out the objectives of plant breeding.

  42. Give an account on clonal selection.

  43. Write a short note on autopolyploidy with an example.

  44. Yesterday, Ramu visited his friend's Orchard, where in he noticed few flowers of certain guava trees are covered using thin paper bags.
    (I) Name the process carried out there.
    (ii) Why it was done so?

  45. Who am I?
    (I) Father of Green Revolution.
    (il) Father of Indian Green Revolution

  46. A plant breeder developed a hybrid sugarcane by grafting two different varieties with desirable characters. The resultant hybrid showed excellent growth and productivity with increased sucrose content compared to its parental forms.
    (I) What does this phenomenon refers to?
    (il) How this condition can be maintained through further generation?

  47. 5 Marks

    3 x 5 = 15
  48. Write a note on heterosis.

  49. Give a comparative account on Seaweed liquid fertilizer.

  50. Explain the steps involved in hybridization.

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