Competitive Exams: Agriculture MCQs (Practice-Test 39 of 56)

  1. Composites ar developed by using

    1. Advanced generation seed mixtures obtained from high yielding intervarietal or interracial crosses

    2. Hybrid directly from intervarietal crosses

    3. recurrent selections for specific combining ability

    4. The hybrid of an inbred with an openpollinated variety

  2. Plants grown from the seed of an openpollinated variety o maize

    1. Var in plant height as well as seed characters

    2. Ar unifor in plant height and seed characters

    3. Var in plant height but ar unifor in seed characters

    4. Ar unifor in plant height but var in seed characters

  3. Superiority of heterozygote leads to

    1. Fixation of recessive allele

    2. Fixation of dominant allele

    3. Maintenance of both the alleles

    4. Depression of inbreeding

  4. Consider the following statements: Composites ar mor popular than the hybrid varieties because the seeds produced by a composite variety

    1. Can be used again as seed for 3 to 4 years

    2. Have negligible inbreeding effect

    3. Make varietals maintenance easy.

    Of these statements

    1. 1, 2 and 3 are correct

    2. 1 and 2 are correct

    3. 2 and 3 are correct

    4. 1 and 3 are correct

  5. Consider the following international crop improvement institutes:

    1. International Centr for Maize and Wheat Improvement, Mexico

    2. Inter national Crops research Institute for the Semi Arid Tropics, India.

    3. International rice research Institute, Philippines.

    4. International Centr for Potato, Peru

    The correct chronological order in which these institutes wer established is

    1. 1, 3, 2, 4

    2. 3, 1, 2, 4

    3. 3, 1, 4, 2

    4. 1, 3, 4, 2

  6. The initial gene pool of a composite population is composed of

    1. Inbred lines

    2. Isolines

    3. Pur lines

    4. Single plants derived from crosses and/or germplasm lines

  7. rice varieties Ir 20, Ir 26 and Ir 36 have shown better resistance to

    1. Tungro

    2. Bacterial leaf blight

    3. Blast

    4. Brown plant hopper

  8. In cotton, the popularly grown commercial hybrid ‘varalaxmi’ is the product of

    1. Intraspecific hybridization in Gossypium hirsutum

    2. Intraspecific hybridization in Gossypium barbadense

    3. Interspecific hybridization between Gossypium hirsutum and Gossypium barbadense

    4. Interspecific hybridization between

    Gossypiuym arboretum and

    Gossypium herbaceum

  9. Jawahar Vikram, Kisan and Sona the important varieties of maize are

    1. Double-oss hybrids

    2. Synthetic varieties

    3. Composite varieties

    4. Single-oss hybrids

  10. The initial gene pool of a synthetic population is composed of

    1. Plants from an open-llinated variety

    2. Pur lines

    3. Inbred lines

    4. Isolines

  11. Consider the following sets of varieties of wheat:

    1. Sonalika and Safed Lerma

    2. Lerma rojo and Chhoti Lerma

    3. Heer and Moti

    The 3-ne dwar varieties of wheat would include

    1. 1, 2 and 3

    2. 1 alone

    3. 2 and 3

    4. 3 alone

  12. In maize, ‘ganga-fed’ is a

    1. Single-oss hybrid

    2. Double-oss hybrid

    3. Three-y cross hybrid

    4. Double top cross hybrid

  13. Litchi does NOT flower in South Indian plateau in winter months

    1. For want o sufficient low temperature in winter months

    2. Because of the high temperature prevalent at the time of flower formation

    3. Because of high relative humidity present at the time of flower formation

    4. Because of the excessive light stimulus present at the time of flower formation

  14. In the case of potato, the seed rate per hectare

    1. 1 quintal

    2. 5 quintals

    3. 10 quintals

    4. 15 quintals

  15. Grapes ar pruned only once in northern India while they ar pruned twice in souther India. This difference is due to the fact that grapes

    1. Shed leaves in winter in norther India while they remain evergreen in souther India

    2. Ar early in bearing is norther India while they bear late in souther India

    3. Bear lightly in norther India while they bear heavily in souther India

    4. Ar less prone to diseases in northern

    India while they ar mor prone to diseases in souther India

  16. Which one of the following rose cultivars has striped flowers?

    1. Abhisarica

    2. Bhim

    3. Chitchore

    4. Mrinalini

  17. Consider the following species:

    1. Bougainvillea

    2. Hibiscus

    3. Lantana

    4. Poinsettia

    The species wher the foliage beauty is due to modification of leaves as bracts would include

    1. 1 and 2

    2. 2 and 3

    3. 3 and 4

    4. 1 and 4

  18. Consider the following statements: In early pre-aring life of pear orchards, peach is grown in between pear trees because it

    1. Generates some additional income.

    2. Protects pear trees from hot winds.

    3. Improves micro-imate for pears.

    4. Prevents sun scald of pear fruit.

    Of these statements

    1. 1 alone is correct

    2. 2 and 3 are correct

    3. 1 and 4 are correct

    4. 1, 2 and 4 are correct

  19. Consider the following statements: Mulching of banana crop with black polythene reduces the population of weed because it

    1. restricts the supply of oxygen.

    2. results in excessive moistur in the root zone of weeds.

    3. Obstructs light and hence the weed starves.

    Of these statements

    1. 1 and 2 are correct

    2. 2 and3 are correct

    3. 3 alone is correct

    4. 1, 2 and 3 are correct

  20. Which one of the following fruits contains mor fat than the rest?

    1. Apple

    2. Guava

    3. Avocado

    4. Jack fruit

  21. Match List I (Fruits) with List II (Carbohydrates content) and select the correct answer:

    List-I List-II
    1. Jack fruit

    2. Banana

    3. Guava (plains)

    4. Mango (ripe)

    1. 11%

    2. 14%

    3. 36%

    4. 19%

    • A
    • B
    • C
    • D
      • 4
      • 3
      • 2
      • 1
      • 4
      • 3
      • 2
      • 1
      • 3
      • 4
      • 2
      • 1
      • 3
      • 4
      • 1
      • 2
  22. Which one of the following fruits is cured in smoke for ripening?

    1. Mango

    2. Orange

    3. Jackfruit

    4. Banana

  23. Lemon squash is preserved for a longer period without discoloration by the use of

    1. Malic acid and potassium metabisulphite

    2. Citric acid and potassium metabisulphite

    3. Benzoic acid and citric acid

    4. Potassium metabisulphite

  24. The flat sour spoilage of canned vegetables is due to

    1. Development of sour odour without gas production by microorganisms

    2. Gas formation by the microorganisms

    3. Corrosion of the tin plate

    4. A decrease in pH

  25. Match List I (Diseases) with List II (Causal organisms) and select the correct answer:

    List-I List-II
    1. Citrus canker

    2. Black rot

    3. Brown rot

    4. Crown gall

    1. Pseudomonas solanacearum

    2. Agrobacterium tumefactions

    3. Xanthomonas campestris pv. Campestris

    4. Xanthomonas campestris pv. Citri

    • A
    • B
    • C
    • D
      • 4
      • 3
      • 1
      • 2
      • 3
      • 4
      • 2
      • 1
      • 3
      • 4
      • 1
      • 2
      • 4
      • 3
      • 2
      • 1
  26. Which of the following pair are correctly matched?

      • Brown spot of rice
      • Helminthosporium oryzae
      • Karnal bunt of wheat
      • Heovossia indica
      • Bunt of rice
      • Eovossia horrida
      • Hill bunt of wheat
      • Ustilago tritici

    Select the correct answer using the codes given below:

    1. 2, 3 and 4

    2. 1, 2 and 4

    3. 1, 3 and 4

    4. 1, 2 and 3

  27. Loose smut of wheat can be effectively controlled by

    1. Corporation

    2. Soil treatment with non-stemic fungicides

    3. Seed treatment with systemic fungicides

    4. Spraying the crop with fungicides

  28. Which one of the following correctly defines the period between inoculation and appearance of the first disease symptom?

    1. Penetration period

    2. Latent period

    3. Incubation period

    4. Infection period

  29. Match List I (Causal agent) with List II (Disease caused) and select the correct answer:

    List-I List-II
    1. Virus

    2. Mycoplasm

    3. Fungus

    4. Viroid

    1. Sesamum phyllody

    2. Potato spindle tuber

    3. Yellow vein mosaic of okra

    4. Downy mildew of bajra

    • A
    • B
    • C
    • D
      • 1
      • 3
      • 2
      • 4
      • 3
      • 1
      • 4
      • 2
      • 3
      • 1
      • 2
      • 4
      • 1
      • 3
      • 4
      • 2
  30. Match List I (Parasite) with List II (Nature of the parasite) and select the correct answer:

    List-I List-II
    1. Striga

    2. Cuscuta

    3. Loranthus

    4. Orobanche

    1. Semi-rasite on stem

    2. Semi-rasite on root

    3. Total parasite on root

    4. Total parasite on stem

    • A
    • B
    • C
    • D
      • 1
      • 2
      • 3
      • 4
      • 2
      • 4
      • 3
      • 1
      • 2
      • 4
      • 1
      • 3
      • 1
      • 2
      • 4
      • 3