Competitive Exams: Agriculture MCQs (Practice-Test 21 of 56)

    • Assertion (A): 2, 4, 5-is lethal to wild cucumber whereas 2, 4-is not.
    • Reason (R): 2, 4 5-remains unaltered in the toxic from inside the plant.
    1. Both A and R ar individually true and r is the correct explanation of A.

    2. Both A and R ar individually 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): Topping is an important operation in tobacco.
    • Reason (R): Topping causes the expansion of leaves by diverting the nutrients and energy from vertical growth to leaf development.
    1. Both A and R ar individually true and r is the correct explanation of A.

    2. Both A and R ar individually 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): The F1 generation following hybridization between two inbred fines gives higher yield than the F2 generation of the same cross.
    • Reason (R): The F1 generation is homogeneous while the F2 generation is heterogeneous.
    1. Both A and R ar individually true and r is the correct explanation of A.

    2. Both A and R ar individually 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): Some plants exhibit from chlorosis when grown in calcareous soils.
    • Reason (R): High concentration of calcium ions in soil prevents the absorption of iron by root hairs.
    1. Both A and R ar individually true and r is the correct explanation of A.

    2. Both A and R ar individually 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): Detasseling operation is helpful to increase yields in maize.
    • Reason (R): Detasseling in maize emasculates the whole plant.
    1. Both A and R ar individually true and r is the correct explanation of A.

    2. Both A and R ar individually 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): The “Law of Independent Assortment” does not apply to the genes located on the same chromosome.
    • Reason (R): The independent assortment of character is based on the assortment of non-homologous chromosomes.
    1. Both A and R ar individually true and r is the correct explanation of A.

    2. Both A and R ar individually 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): Ex-tu conservation of wild relatives of cultivated plants is the best method of germless conservation.
    • Reason (R): Ex-tu conservation does not permit major evolutionar changes over a period of time.
    1. Both A and R ar individually true and r is the correct explanation of A.

    2. Both A and R ar individually 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

  1. The total spray volume required for spraying one hectar area through ultra low volume sprayer is:

    1. Less than 5 litres

    2. 8 to 12 litres

    3. 15 to 20 litres

    4. Mor than 20 litres

  2. Consider the following statements: The philosophy of pest management is:

    1. To maintain the pest population below economic injur level.

    2. To eradicate the pest.

    3. To maintain the ecological balance.

    4. To suppress the natural enemies.

    Which of the statements given above are correct?

    1. 1 and 2

    2. 2 and 3

    3. 1 and 4

    4. 1 and 3

  3. Which one of the following microorganisms is being utilized as bio-ntrol agent against soil borne diseases?

    1. Trichoderma

    2. NPV

    3. Alternaria

    4. Phytophthora

  4. Which one of the following pests is controlled through the application of grease band around the tree trunks?

    1. Mango mealy bug

    2. Trunk borer of mango

    3. Codling moth of apple

    4. Wooly aphis of apple

  5. Clipping the tips of seedlings prior to transplantation in rice helps in the management of:

    1. Grasshoppers

    2. Stem borers

    3. Case-rm

    4. Brown plant hop

  6. Which of the following refer to Zinc Phosphate poison?

    1. Slow poison

    2. Anticoagulant

    3. Acute poison

    4. Mild poison

  7. Which one of the following male insects produces sex pheromones?

    1. rice weevil

    2. Pink boll worm

    3. Coton boll worm

    4. Pink borer

  8. Methyl eugenol is used as a lur for killing which one of the following?

    1. rice hispa

    2. Gypsy moth

    3. Tobacco cutworm

    4. Fruit fly

  9. Consider the following pairs:

      • Aphid
      • Cauda and cornicles
      • Jassid
      • Pear shaped
      • Bug
      • Cicadelliadae

    Which of the pair/pair given above is/are correctly matched?

    1. 1 only

    2. 2 and 3 only

    3. 1 and 3 only

    4. 1, 2 and 3

  10. The brown plant hopper of rice transmits the disease

    1. rice dwarf

    2. rice hoja blanka

    3. rice grassy stunt

    4. rice grassy shoot

  11. Which one of the following fungi is used against the coconut mite?

    1. Beaveria bassiana

    2. Nomurea relgi

    3. Hirsutella thornpsonii

    4. Trichoderma viridae

  12. Consider the following statements:

    1. In potassium deficiency, leaf tip curves downward.

    2. In high sulphur deficiency, younger leaves show chlorosis first of all.

    3. In iron deficiency, old leaves show chlorosis and younger leaves do not show it.

    Which of the statements given above is/are correct?

    1. 1 and 2 only

    2. 2 only

    3. 1 and 3 only

    4. 1, 2 and 3

  13. Consider the following statements:

    1. Zinc ion is a cofactor for the enzyme carbonic anhydrate.

    2. A common symptom of Zinc deficiency in plants is leaf mottling.

    Which of the statements given above is/are correct?

    1. 1 only

    2. 2 only

    3. Both 1 and 2

    4. Neither 1 nor 2

  14. Whiptail in Brassica is due to the deficiency of:

    1. Calcium

    2. Molybdenum

    3. Manganese

    4. Zinc

  15. Consider the following statements: In TCA or Krebs Cycle, CO2 is released when

    1. Isocitric acid is converted to α-Ketoglutaric acid.

    2. Succinic acid is converted to fumaric acid.

    3. Malic acid is converted to oxaloacetic acid.

    4. α-ketoglutaric acid is converted to succinyl CoA.

    Which of the statements given above are correct?

    1. 1, 2 and 3

    2. 2 and 3 only

    3. 3 and 4

    4. 1 and 4

  16. Consider the following statements: A characteristic of CAM plants is that

    1. The stomata ar open by night and closed during day.

    2. CO2 is fixed during night in organic acids and during day time it is fixed by the catalytic action of ruBP carboxyiase.

    Which of the statements given above is/are correct?

    1. 1 only

    2. 2 only

    3. Both 1 and 2

    4. Neither 1 nor 2

  17. Consider the following statements: Scarification technique helps in:

    1. removing seed coat.

    2. retrieving immatur embryo.

    3. Increasing permeability to water.

    4. Increasing permeability to gases.

    Which of the statements given above are correct?

    1. 1 and 2 only

    2. 1, 2 and 3

    3. 1, 3 and 4

    4. 2, 3 and 4

  18. Consider the following statements:

    1. Ethylene induces senescence in leaves and flowers.

    2. Synthesis of cytokine takes place in the roots of plants.

    Which of the statements given above is/are correct?

    1. 1 only

    2. 2 only

    3. Both 1 and 2

    4. Neither 1 nor 2

  19. The phenotype (P) is the function of genotype (G) and environment (E), but when individual genotype is subjected to multi-vironmental testing, the phenotypic expression is the result of:

    1. G alone

    2. E alone

    3. G + E

    4. G + E + (G x E)

  20. A commercially cultivated plant species has tetrapolid chromosome number that is 2n = 8. What will a plant developed from pollen cultur of this species be?

    1. Haploid

    2. Dihaploid

    3. Monoploid

    4. Diploid

  21. Which one of the following statements is not correct?

    1. Individuals belonging to primar gene pool ar crossable sexually

    2. Individually belonging to primar and secondar gene pools can produce offspring by sexual crossing followed by embryo rescue

    3. Individuals belonging to primar and tertiar pools do not generally produce offspring even by embryo rescue

    4. Somatic hybridization is the best way to hybridize individuals belonging to primar gene pool

  22. Match List-with List-and select the correct answer using the code given below the lists:

    List-I (Type of gene interaction) List-II (Phenotypic ratio)
    1. Inhibitory

    2. Epitasis

    3. Complementary

    4. Duplicate

    1. 9: 7

    2. 15: 1

    3. 13: 1

    4. 12: 3: 1

    • A
    • B
    • C
    • D
      • 3
      • 1
      • 4
      • 2
      • 3
      • 4
      • 1
      • 2
      • 2
      • 1
      • 4
      • 3
      • 2
      • 4
      • 1
      • 3
  23. Around 395 mg of Ca per 100 g of edible portion is found in:

    1. Fenugreek leaves

    2. Yam

    3. Peas

    4. Potato