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

12th Standard

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Biology

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

    Multiple Choice Questions

    15 x 1 = 15
  1. Assertion: Genetic variation provides the raw material for selection
    Reason: Genetic variations are differences in genotypes of the individuals.

    (a)

    Assertion is right and reason is wrong.

    (b)

    Assertion is wrong and reason is right

    (c)

    Both reason and assertion is right.

    (d)

    Both reason and assertion is wrong.

  2. The quickest method of plant breeding is

    (a)

    Introduction

    (b)

    Selection

    (c)

    Hybridization

    (d)

    Mutation breeding

  3. Desired improved variety of economically useful crops are raised by

    (a)

    Natural Selection

    (b)

    hybridization

    (c)

    mutation

    (d)

    biofertilisers

  4. Dwarfing gene of wheat is

    (a)

    pal 1

    (b)

    Atomita 1

    (c)

    Norin 10

    (d)

    pelita 2

  5. Crosses between the plants of the same variety are called

    (a)

    interspecific

    (b)

    inter varietal

    (c)

    intra varietal

    (d)

    inter generic

  6. A wheat variety, Atlas 66 which has been used as a donor for improving cultivated wheat, which is rich in

    (a)

    iron

    (b)

    carbohydrates

    (c)

    proteins

    (d)

    vitamins

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

    (a)

    Emasculation

    (b)

    Hybridization

    (c)

    Domestication

    (d)

    Acclimatization

  8. Azolla is best suited biofertilizer for _________

    (a)

    Sugar cane cultivation

    (b)

    Paddy cultivation

    (c)

    Wheat cultivation

    (d)

    Cotton cultivation

  9. 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

  10. 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

  11. The term green revolution was coined by ___________

    (a)

    William S Gaud

    (b)

    M.S. Swaminathan

    (c)

    Dr. B.P. Pal

    (d)

    Dr. N.E. Borla

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

    (a)

    White rust

    (b)

    Leaf curl

    (c)

    Black rot

    (d)

    Hill bunt

  13. Atlas 66 is an improved variety of ____________

    (a)

    Rice

    (b)

    Maize

    (c)

    Wheat

    (d)

    Spinach

  14. Damping off of tomato is controlled by

    (a)

    Beauveria species

    (b)

    Trichoderma species

    (c)

    Acacia species

    (d)

    Pseudomonas species

  15. Atomita 2 - rice is a product by _________

    (a)

    Polyploid breeding

    (b)

    Hybridization

    (c)

    Mutation breeding

    (d)

    Clonal selection

  16. 2 Marks

    10 x 2 = 20
  17. How are microbial innoculants used to increase the soil fertility?

  18. What is meant by domestication of plants?

  19. What is plant breeding?

  20. Define acclimatization.

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

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

  23. What does the term 'luxuriance' stands for in plant breeding? Explain.

  24. Name any two allopolyploid plant species

  25. What is Biofortification?

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

  27. 3 Marks

    15 x 3 = 45
  28. Explain the best suited type followed by plant breeders at present?

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

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

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

  32. Mention any three advantages of Arbuscular mycorrhizal association.

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

  34. Write a note on Green Manuring.

  35. Give an account on clonal selection.

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

  37. Given below are the examples of symbiotic association in which one partner was mentioned. Write the name of the mutual co-partners.
    (a) Azolla fem + _________
    (b) Root nodules of legume plants + ______
    (c) phycomycetous fungi + ________

  38. State the objective of using green manuring.

  39. Why plant Breeding is carried out by farmers and scientists?

  40. 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?

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

  42. 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?

  43. 5 Marks

    4 x 5 = 20
  44. Write a note on heterosis.

  45. List out the new breeding techniques involved in developing new traits in plant breeding.

  46. Give a comparative account on Seaweed liquid fertilizer.

  47. Explain the steps involved in hybridization.

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