Competitive Exams: Agriculture MCQs (Practice-Test 26 of 56)

  1. Which nitrogen transformation process is responsible for causing a decrease in Nitrate-under anaerobic condition?

    1. Mineralization

    2. Notification

    3. Denitrification

    4. Immobilization

  2. Availability of plant nutrients in the soil can be assessed by extraction of the given nutrient from the soil by a specific chemical regent. Match the nutrient in List I with extracting reagent in List II and select the correct answer using the code given below the lists:

    List-I (Plant Nutrient) List-II (reagent for extraction of the nutrient from soil)
    1. Potassium

    2. Phosophorus

    3. Zinc

    4. Molybdenum

    1. Sodium bicarbonate

    2. Ammonium acetate

    3. DTPA

    4. Ammonium oxalate

    • A
    • B
    • C
    • D
      • 2
      • 3
      • 1
      • 4
      • 2
      • 1
      • 3
      • 4
      • 4
      • 3
      • 1
      • 2
      • 4
      • 1
      • 3
      • 2
  3. Which one of the following leads to prematur bolting in spinach?

    1. Low temperature

    2. High temperature

    3. High moisture

    4. High wind velocity

  4. Which of the cations occur as dominant solutes in ‘mM’ concentration in soil solution?

    1. Na +, K +, Ca + +, Al + + +, Mn + +

    2. Na +, K +, Fe + +, Mn + +

    3. Na +, K +, Mg + +, Ca + +, 4 NH +

    4. K +, Mg +, Ca + +, Mn + +, Fe + + +

  5. The amount of nitrogen fixed by soybean in kg N hecatres in which range?

    1. Nitrogen fixed 100 − 0

    2. Nitrogen fixed 35-

    3. Nitrogen fixed 15-

    4. Nitrogen fixed <15

  6. Which of the following micronutrients is especially tightly held by organic matter that its availability to crap plants can be ver low in organic soils?

    1. Zinc

    2. Iron

    3. Copper

    4. Manganese

  7. Consider the following fruits:

    1. Banana

    2. Litchi

    3. Pineapple

    4. Strawberry

    In which of the above is shape of the fruit one of the maturity indices for their harvesting?

    1. 1, 2 and 3 only

    2. 1 and 3 only

    3. 2 and 4 only

    4. 1, 2, 3 and 4

  8. Which one of the following groups of nutrients is absorbed by plants only in anionic form?

    1. Nitrogen, Manganese and Phosphorus

    2. Phosphorus, Sulphur and Boron

    3. Copper Zinc and Iron

    4. Molybdenum, Potassium

    Manganese

  9. Among the following four common constituents of organic manures, the slowest rate of decomposition is seen with which of the following?

    1. Cellulose

    2. Sugar

    3. Lignin

    4. Hemicelluloses

  10. When ammonia reacts with water what is the result?

    1. Increased nitrate content and decreased pH

    2. Decreased nitrate content and increased pH

    3. Increased ammonium content and decreased pH

    4. Increased ammonium content and increased pH

  11. Consider the following statements: Pedigree method of breeding is

    1. Most common in cross-llinated crops

    2. Commonly used in breeding for disease resistance

    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

  12. Consider the following events in the mitotic division of a plant cell:

    1. The duration of prophase is larger than anaphase.

    2. The DNA synthesis takes place in prophase stage of cell division.

    Which of the events given above is/are correct?

    1. 1 only

    2. 2 only

    3. Both 1 and 2

    4. Neither 1 nor 2

  13. For application of phosphrous at the rate of 50kg P2O5 ha-to cotton crop, the quantity in kg of single super-phosphate (P2O5 = 16%) required for 11 2 acres is:

    1. Phosphate 80

    2. Phosphate 108

    3. Phosphate 188

    4. Phosphate 216

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

    List-I (Statement) List-II (Compound/Product)
    1. First stable product of CO2 fixation in C3 plants

    2. CO2 acceptor for CO2 fixation in C4 plants

    3. CO2 acceptor for CO2 fixation in C3 plants

    4. Diurnal fluctuations in acidity in CAM plants

    1. Phosphoenol-ruvate

    2. Mallic acid

    3. 3-ospho-yceric acid

    4. ribulose 1, 5 biophosphate

    5. Oxaloacetic acid

    • A
    • B
    • C
    • D
      • 1
      • 5
      • 2
      • 4
      • 1
      • 5
      • 4
      • 2
      • 3
      • 1
      • 2
      • 4
      • 3
      • 1
      • 4
      • 2
  15. Consider the following statements

    1. In chloroplasts, photosynthetic pigments ar present in the stroma.

    2. In chloroplasts, CO2 fixation takes place in grana hyracoid.

    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

  16. During seed germination in oilseeds, in which of the following cell organelles, fats ar converted to carbohydrates by beta-oxidation?

    1. Mitochondria

    2. Glyoxisomes

    3. Peroxisomes

    4. Golgi bodies

  17. Which one of the following is an unsaturated fatty add?

    1. Laurie acid

    2. Palmitic acid

    3. Oleic acid

    4. Stearic acid

  18. Match List I with List II and select the correct answer using the code given below the lists:

    List-I (Element) List-II (Biochemical Function)
    1. Si

    2. Mg

    3. Cu

    4. Zn

    1. Component of plastocyanin

    2. Component of ceil wails

    3. Constituent of chlorophyll

    4. Constituent of alcohol dehydrogenate

    • A
    • B
    • C
    • D
      • 2
      • 3
      • 1
      • 4
      • 2
      • 1
      • 3
      • 4
      • 4
      • 3
      • 1
      • 2
      • 4
      • 1
      • 3
      • 2
  19. Photo-similates ar principally Tran located from source to sink in plants in which form?

    1. Mannitol

    2. Glucose

    3. Sucrose

    4. Fructose

  20. Consider the following Paris: Pests of rice Damage

      • Leptocoria Varicornis
      • Nymphs and adults suck, the milky sap of grains
      • Tryporyza incertulas
      • Maggots attack the base of the growing point and produce long, tubular silver galls
      • Tetraneur hirsute
      • Colonies of nymphs and adults such sap from roots just below soil surface

    Which of the above pair are correctly matched?

    1. 1 and 2 only

    2. 2 and 3 only

    3. 1 and 3 only

    4. 1, 2 and 3

  21. Which one of the following is the correct sequence of the organic acids in the Krebs'cycle in mitochondria?

    1. Citrate-Isocitrate-Ketoglutarate-Succinate

    2. Citrate-Ketoglutarate-Isocitrate-Succinate

    3. Isocitrate-Succinate-Ketogiutarate-Citrate

    4. Ketogiutarate-Isocitrate-Succinate-Citrate

  22. Which one of the following fruit crops are amphidiploids?

    1. Mango

    2. Strawberry

    3. Banana

    4. Kiwifruit

  23. Which one of the following pair is not correctly matched?

      • Naturally occurring auxins
      • IAA and IBA
      • Synthetic auxins
      • NAA and 2, 4 − D
      • Naturally occurring cytokines
      • Zeatin and Kinetin
      • Naturally occurring growth inhibitors
      • ABA and Lunularic acid
  24. Consider the following statements:

    1. The entir Benson-lvin cycle of photosynthesis is catalyzed by nine enzymes

    2. Each molecule of CO2 fixed in the

    Benson-lvin cycle requires 3 ATP and 2NADPH to be provided by photosynthesis electron transport.

    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

  25. Which one of the following properties of the seeds is tested by 2, 3, 5-triphenyltetrazolium chloride (TZ)?

    1. Viability

    2. Purity

    3. Moistur content

    4. Germination

  26. Consider the following statements associated with the genetic male sterility in crop plants:

    1. Male sterility is controlled by a single recessive gene.

    2. Male sterile plants ar maintained by crossing with the heterozygous male fertile 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

  27. Consider the following statements: Fixable component of genetic variability is governed by

    1. Additive Genes

    2. Dominant genes

    3. Epistemic genes of Additive-Additive (A-A) type

    4. Epistemic genes of Additive-

    Dominance (A-D) type

    Which of the statements given above are correct?

    1. 1 and 2 only

    2. 1, 3 and 4 only 5.

    3. 1 and 3 only

    4. 2 and 4 only

  28. Which one of the following plants has the XX female and XY ale system of sexdetermination?

    1. Meiandrium

    2. Fragaria

    3. Valiisneria spiralis

    4. Asparagus officinalis

  29. Which one of the following breeding methods is based on the competitiveness of the genotypes under adverse environmental conditions?

    1. Mass selection

    2. Bulk selection

    3. recurrent selection

    4. Pur line selection

  30. Consider the following statements:

    1. For the production of triploids, the diploid parents (2X) is used as female and metalloid (4X) as male parent.

    2. Since fruit setting depends upon pollination and the triploids ar pollen sterile, it is necessar to interplant diploid plants among the triploids as pollinator in commercial fields

    Which of the statements given above is/are correct?

    1. 1 only

    2. 2 only

    3. Both 1 and 2