Competitive Exams: Agriculture MCQs (Practice-Test 4 of 56)

  1. Which one of the following insects lays eggs inside the glumes and the larvae feed on the ovaries preventing seed formation?

    1. Sorghum midge

    2. Aphid

    3. Ear head bug

    4. Ear head caterpillar

  2. Which one of the following fungal pathogens produces trim ethylamine giving rise to foul smell?

    1. Ustilago nuda tritici

    2. Tolyposporium penicillariae

    3. Tilletia caries

    4. Sphacelotheca sorghi

  3. Match List I (Fruit crops) with List II (Major diseases) and select the correct:

    List-I List-II
    1. Banana

    2. Citrus

    3. Mango

    4. Papaya

    1. Bacterial canker

    2. Bud rot

    3. Bunchy top

    4. Malformation

    5. ring spot virus

    • A
    • B
    • C
    • D
      • 3
      • 1
      • 2
      • 4
      • 3
      • 1
      • 4
      • 5
      • 1
      • 2
      • 4
      • 5
      • 1
      • 3
      • 2
      • 4
  4. Grassy shoot of sugarcane is caused by

    1. Virus

    2. Fungus

    3. Mycoplasma

    4. Bacteria

  5. Consider the following pair of insects pests and crops affected:

      • Thrips
      • Onion
      • Cutworm
      • Rice
      • Jassids
      • Cotton
      • Gall midge
      • Sorghym

    Which of these pair ar not correctly matched?

    1. 1 and 2

    2. 2 and 4

    3. 1, 3 and 4

    4. 2, 3 and 4

  6. The cell wall of gram-gative plant pathogenic bacteria contains

    1. Cellulose

    2. Teichoic acid

    3. Lipoprotein

    4. Chitin

  7. Which one of the following function (s) of mouth parts of insects makes them effective vector of plant viruses?

    1. Biting and chewing

    2. Piercing and sucking

    3. rasping

    4. Punching

  8. Match List I (Diseases) with List II (Gener of Fungi) and select the correct answer:

    List-I List-II
    1. Cedarple rust

    2. Coffee rust

    3. White pine blister rust

    4. White rust of mustard

    1. Albugo

    2. Cronartium

    3. Gymnosporangium

    4. Hemilleia

    • A
    • B
    • C
    • D
      • 3
      • 4
      • 1
      • 2
      • 2
      • 3
      • 1
      • 4
      • 3
      • 4
      • 2
      • 1
      • 4
      • 3
      • 2
      • 1
  9. Which one of the following prop gules acts as the primar source of inoculums of stem rust of wheat in India?

    1. Uredospores surviving in the plains

    2. Teleutospores formed on wheat straw

    3. Basidiospores harboring on barberry bushes in the hills

    4. Uredospores surviving on stray and self-wn wheat in the hills during the off-ason

  10. Viroids ar the only pathogen that cannot be detected by immunoassays because they

    1. Have no protein coat

    2. Have small circular rNA

    3. Ar ver small in size

    4. Lack one strand of DNA

  11. Quarantine measures have been implicated against

    1. root knot nematode

    2. Golden cyst nematode

    3. Stunt nematode

    4. renifor nematode

  12. In which one of the following situations is the aerial spraying of insecticide effective and advisable?

    1. Presence of different kinds of pest population in the crop

    2. Unifor cultivation of the same crop available in the area

    3. Heavy attack of sucking type of pests

    4. Presence of different types of crops in the area

  13. The genes termed ‘Cr genes’ are associated with

    1. Agrobacterium tumefaciens

    2. Bacillus thuringiensis

    3. Clavibacter xyli

    4. Escherichia coli

  14. Solar-at treatment is highly effective against

    1. red rot of sugarcane

    2. Stalk rot of maize

    3. Late blight of potato

    4. Loose smut of wheat

  15. According to the present concept of Integrated Pest Management (IPM), soil borne diseases like fungal and bacterial wilts of crops could be best managed by

    1. Chemical seed treatment, spraying and fumigation

    2. Growing resistant variety, crop rotation and pre-eatment of seed with chemicals

    3. Flooding of soil, fumigation and drainage

    4. Spraying protective fungicide, hot water treatment of soil and delay in sowing seeds

  16. Which one of the following droplet size ranges is known as “mist spray”

    1. 100 to 250

    2. 50 to 100

    3. 0.1 to 50

    4. 0.001 to 0.1

  17. Consider the following statements: In ultraslow volume (ULV) spraying

    1. One to five lires of fluid per hectar is required

    2. The size of the spray droplets varies from 300 to 500 jam.

    3. The density is 10 to 20 droplets per sq. Cm

    4. Wind velocity of mor than 5 m/sec greatly increases the drift hazard

    Which of the above statements are correct?

    1. 1 and 4

    2. 1 and 2

    3. 1, 2 and 3

    4. 2.3 and 4

    • Assertion (A): The Ninth Five Year Plan has accorded top priority to the agricultural sector
    • Reason (R): Indicative planning aims at achieving a higher level of government spending which is the underlying basis for the Ninth Five Year Plan.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but r is NOT the correct explanation of A

    3. A is true but r is false

    4. A is false but r is true

    • Assertion (A): In stage II of production, the elasticity of production lies between zer and one.
    • Reason (R): Stage II of production is an irrational stage.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but r is NOT the correct explanation of A

    3. A is true but r is false

    4. A is false but r is true

    • Assertion (A): Powdered rock phosphate is found mor effective in supplying the phosphorus to plants if broadcast and mixed with the soil than when placed in localized band form.
    • Reason (R): The cost of rock phosphate is quite less than that of other phosphate fertilizer now available in the market.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but r is NOT the correct explanation of A

    3. A is true but r is false

    4. A is false but r is true

    • Assertion (A): Ammonium salts, when added to the soil, displace exchangeable calcium from soil colloids and the calcium so displaced combines with the mobile anion and gets lost through the percolating water Such loss of calcium is much less when ammonium phosphate is added than when ammonium sulphate is applies to the soi.
    • Reason (R): Ammonium sulphate is easily soluble in water whereas the ammonium phosphate is practically insoluble in water.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but r is NOT the correct explanation of A

    3. A is true but r is false

    4. A is false but r is true

    • Assertion (A): Water flow in soil plantatmosphere continuum is governed mainly by physical forces operating in the environment.
    • Reason (R): Only a small fraction of total water absorbed (less than 10%) is used in metabolic captivities and the rest is transpired.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but r is NOT the correct explanation of A

    3. A is true but r is false

    4. A is false but r is true

    • Assertion (A): Ther is an irreversible increase in size, volume or weight of cells and tissues in growing plants. This irreversible increase is called growth.
    • Reason (R): A series of metabolic events results in biosynthesis of new protoplasmic constituents which accumulate in cells or tissues of growing plants.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but r is NOT the correct explanation of A

    3. A is true but r is false

    4. A is false but r is true

    • Assertion (A): Sugarcane crop is a complex polyploidy highly heterozygous, does not flower freely and flower may not set seed due to male sterility or incompatibility.
    • Reason (R): Xenia is the main cause of

    Incompatibility.

    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but r is NOT the correct explanation of A

    3. A is true but r is false

    4. A is false but r is true

    • Assertion (A): Cytoplasmic male sterility and fertility restoration ar only two of the factor needed to produce hybrid wheat economically.
    • Reason (R): Wheat normally is selfpollinated, it may not be easy to get seed on male-erile plants which depend on wind-own pollen for fertilization.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but r is NOT the correct explanation of A

    3. A is true but r is false

    4. A is false but r is true

    • Assertion (A): Guava tree is ver hardy growing with little attention and even wild under some conditions in India.
    • Reason (R): Growing guava under condition of neglect is natural for India because it is native to this country.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but r is NOT the correct explanation of A

    3. A is true but r is false

    4. A is false but r is true

    • Assertion (A): Disbudding operation is essential for all varieties of chrysanthemum.
    • Reason (R): Disbudding operation leads to production of less number of big-size flowers.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but r is NOT the correct explanation of A

    3. A is true but r is false

    4. A is false but r is true

    • Assertion (A): Leafy vegetables in diet ar known to tone up human digestive system.
    • Reason (R): Leafy vegetables ar rich sources of Vitamin D and E.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but r is NOT the correct explanation of A

    3. A is true but r is false

    4. A is false but r is true

    • Assertion (A): Use of synthetic parathyroid cause resurgence of white fly in tobacco.
    • Reason (R): Wide-ectrum insecticides kill natural enemies of a pest as well.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but r is NOT the correct explanation of A

    3. A is true but r is false

    4. A is false but r is true

    • Assertion (A): Use of DDT in agriculture is banned.
    • Reason (R): DDT is of persistent nature with a half-fe of 30 days.
    1. Both A and R are true and R is the correct explanation of A

    2. Both A and R are true but r is NOT the correct explanation of A

    3. A is true but r is false

    4. A is false but r is true