{"id":12793,"date":"2025-09-23T06:16:23","date_gmt":"2025-09-23T05:16:23","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=12793"},"modified":"2025-10-22T10:30:31","modified_gmt":"2025-10-22T09:30:31","slug":"fertilizers-top-100-mcqs-with-answer-and-explanation","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2025\/09\/23\/fertilizers-top-100-mcqs-with-answer-and-explanation\/","title":{"rendered":"Fertilizers Top 100 MCQs With Answer and Explanation"},"content":{"rendered":"\n

1. Fertilizers are substances used to:<\/mark><\/strong>
a) Increase soil acidity
b) Supply nutrients to plants
c) Kill insects
d) Reduce water content
Answer:<\/strong> b) Supply nutrients to plants
Explanation:<\/strong> Fertilizers enrich soil with essential nutrients for plant growth.<\/p>\n\n\n\n

2. Which element is known as the \u201cKing of Fertilizers\u201d?<\/mark><\/strong>
a) Phosphorus
b) Potassium
c) Nitrogen
d) Calcium
Answer:<\/strong> c) Nitrogen
Explanation:<\/strong> Nitrogen is required in largest quantity and enhances leaf growth.<\/p>\n\n\n\n

3. Urea is a:<\/mark><\/strong>
a) Nitrogenous fertilizer
b) Phosphatic fertilizer
c) Potassic fertilizer
d) Mixed fertilizer
Answer:<\/strong> a) Nitrogenous fertilizer
Explanation:<\/strong> Urea contains about 46% nitrogen<\/strong>.<\/p>\n\n\n\n

4. The chemical formula of urea is:<\/mark><\/strong>
a) NH\u2084NO\u2083
b) CO(NH\u2082)\u2082
c) NH\u2084Cl
d) (NH\u2084)\u2082SO\u2084
Answer:<\/strong> b) CO(NH\u2082)\u2082
Explanation:<\/strong> Urea is carbamide with formula CO(NH\u2082)\u2082.<\/p>\n\n\n\n

5. Which fertilizer has the highest nitrogen content?<\/mark><\/strong>
a) Urea
b) Ammonium nitrate
c) Calcium ammonium nitrate
d) Ammonium sulphate
Answer:<\/strong> a) Urea
Explanation:<\/strong> Urea contains 46% nitrogen, highest among solid fertilizers.<\/p>\n\n\n\n

6. Superphosphate of lime is a:<\/mark><\/strong>
a) Nitrogen fertilizer
b) Phosphate fertilizer
c) Potassium fertilizer
d) Micronutrient
Answer:<\/strong> b) Phosphate fertilizer
Explanation:<\/strong> Superphosphate contains calcium dihydrogen phosphate.<\/p>\n\n\n\n

7. Potash fertilizers mainly supply:<\/mark><\/strong>
a) N
b) P
c) K
d) Ca
Answer:<\/strong> c) K
Explanation:<\/strong> Potash fertilizers provide potassium for fruit and flower development.<\/p>\n\n\n\n

8. Which of the following is a potassic fertilizer?<\/mark><\/strong>
a) KCl
b) K\u2082SO\u2084
c) KNO\u2083
d) All of these
Answer:<\/strong> d) All of these
Explanation:<\/strong> All these compounds are sources of potassium.<\/p>\n\n\n\n

9. Ammonium sulphate contains nitrogen in the form of:<\/mark><\/strong>
a) Nitrate
b) Ammonium
c) Urea
d) Both a and b
Answer:<\/strong> b) Ammonium
Explanation:<\/strong> (NH\u2084)\u2082SO\u2084 \u2192 nitrogen is present as ammonium ions.<\/p>\n\n\n\n

10. Which element is essential for chlorophyll formation?<\/mark><\/strong>
a) Iron
b) Magnesium
c) Potassium
d) Calcium
Answer:<\/strong> b) Magnesium
Explanation:<\/strong> Magnesium is the central atom in chlorophyll molecule.<\/p>\n\n\n\n

11. Which fertilizer is also known as \u201cfarmer\u2019s friend\u201d?<\/mark><\/strong>
a) Ammonium sulphate
b) Urea
c) Superphosphate
d) Green manure
Answer:<\/strong> b) Urea
Explanation:<\/strong> Due to high nitrogen content, urea is widely used.<\/p>\n\n\n\n

12. The main nutrient supplied by bone meal is:<\/mark><\/strong>
a) Nitrogen
b) Phosphorus
c) Potassium
d) Magnesium
Answer:<\/strong> b) Phosphorus
Explanation:<\/strong> Bone meal is a natural source of phosphate.<\/p>\n\n\n\n

13. Essential nutrients for plant growth are classified as:<\/mark><\/strong>
a) Macronutrients and micronutrients
b) Major and minor elements
c) Primary and secondary nutrients
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> Classification is based on quantity and importance.<\/p>\n\n\n\n

14. Which of the following is a primary macronutrient?<\/mark><\/strong>
a) Fe
b) Cu
c) N
d) Zn
Answer:<\/strong> c) N
Explanation:<\/strong> N, P, K are primary macronutrients.<\/p>\n\n\n\n

15. Which nutrient deficiency causes stunted growth and yellow leaves?<\/mark><\/strong>
a) Nitrogen
b) Phosphorus
c) Potassium
d) Magnesium
Answer:<\/strong> a) Nitrogen
Explanation:<\/strong> Nitrogen is vital for protein synthesis \u2192 deficiency causes chlorosis.<\/p>\n\n\n\n

16. Which nutrient promotes root growth and seed formation?<\/mark><\/strong>
a) Nitrogen
b) Phosphorus
c) Potassium
d) Calcium
Answer:<\/strong> b) Phosphorus
Explanation:<\/strong> P helps in root development and flowering.<\/p>\n\n\n\n

17. Which nutrient improves resistance to disease in plants?<\/mark><\/strong>
a) Nitrogen
b) Potassium
c) Phosphorus
d) Sulphur
Answer:<\/strong> b) Potassium
Explanation:<\/strong> K strengthens plant tissues and improves disease resistance.<\/p>\n\n\n\n

18. Which fertilizer is a source of both nitrogen and phosphorus?<\/mark><\/strong>
a) Urea
b) Diammonium phosphate (DAP)
c) Superphosphate
d) Ammonium sulphate
Answer:<\/strong> b) Diammonium phosphate (DAP)
Explanation:<\/strong> DAP contains ~18% N and 46% P\u2082O\u2085.<\/p>\n\n\n\n

19. Which micronutrient is essential for nitrogen fixation in legumes?<\/mark><\/strong>
a) Iron
b) Molybdenum
c) Zinc
d) Copper
Answer:<\/strong> b) Molybdenum
Explanation:<\/strong> Mo is required by nitrogenase enzyme for nitrogen fixation.<\/p>\n\n\n\n

20. Deficiency of potassium in plants causes:<\/mark><\/strong>
a) Weak stems and poor fruit quality
b) Poor root growth
c) Chlorosis in leaves
d) Reduced flowering
Answer:<\/strong> a) Weak stems and poor fruit quality
Explanation:<\/strong> Potassium improves stem strength and fruit quality.<\/p>\n\n\n\n

21. The fertilizer \u201cammonium phosphate\u201d contains:<\/mark><\/strong>
a) Only nitrogen
b) Only phosphorus
c) Both nitrogen and phosphorus
d) Both phosphorus and potassium
Answer:<\/strong> c) Both nitrogen and phosphorus
Explanation:<\/strong> Ammonium phosphate provides N and P.<\/p>\n\n\n\n

22. Which fertilizer is hygroscopic and must be stored carefully?<\/mark><\/strong>
a) Ammonium sulphate
b) Urea
c) Superphosphate
d) Potassium chloride
Answer:<\/strong> b) Urea
Explanation:<\/strong> Urea absorbs moisture from air and cakes easily.<\/p>\n\n\n\n

23. Which of the following is an organic fertilizer?<\/mark><\/strong>
a) Urea
b) Compost
c) Ammonium nitrate
d) DAP
Answer:<\/strong> b) Compost
Explanation:<\/strong> Organic fertilizers come from plant\/animal waste (compost, manure).<\/p>\n\n\n\n

24. Green manure is obtained from:<\/mark><\/strong>
a) Animal dung
b) Decomposed green plants
c) Ammonium salts
d) Bone meal
Answer:<\/strong> b) Decomposed green plants
Explanation:<\/strong> Leguminous plants like sunn hemp are ploughed into soil as green manure.<\/p>\n\n\n\n

25. Which one of the following is not a fertilizer but a soil conditioner?<\/mark><\/strong>
a) Gypsum
b) Urea
c) Superphosphate
d) Potassium nitrate
Answer:<\/strong> a) Gypsum
Explanation:<\/strong> Gypsum improves soil texture and supplies calcium, but is not a primary fertilizer.<\/p>\n\n\n\n

26. Which of the following is a nitrogenous fertilizer?<\/mark><\/strong>
a) Urea
b) Superphosphate
c) Potassium sulphate
d) Gypsum
Answer:<\/strong> a) Urea
Explanation:<\/strong> Urea contains 46% nitrogen, no P or K.<\/p>\n\n\n\n

27. Ammonium nitrate contains nitrogen in which forms?<\/mark><\/strong>
a) Nitrate only
b) Ammonium only
c) Both ammonium and nitrate
d) Urea
Answer:<\/strong> c) Both ammonium and nitrate
Explanation:<\/strong> NH\u2084NO\u2083 provides nitrogen in two readily available forms.<\/p>\n\n\n\n

28. Calcium ammonium nitrate (CAN) contains about:<\/mark><\/strong>
a) 10% N
b) 15% N
c) 25% N
d) 33% N
Answer:<\/strong> c) 25% N
Explanation:<\/strong> CAN typically has ~25% nitrogen.<\/p>\n\n\n\n

29. Ammonium sulphate is produced by reaction of:<\/mark><\/strong>
a) NH\u2083 + HCl
b) NH\u2083 + H\u2082SO\u2084
c) NH\u2083 + CO\u2082
d) NH\u2083 + HNO\u2083
Answer:<\/strong> b) NH\u2083 + H\u2082SO\u2084
Explanation:<\/strong> 2NH\u2083 + H\u2082SO\u2084 \u2192 (NH\u2084)\u2082SO\u2084.<\/p>\n\n\n\n

30. Which nitrogen fertilizer is explosive in nature?<\/mark><\/strong>
a) Urea
b) Ammonium nitrate
c) Calcium nitrate
d) Sodium nitrate
Answer:<\/strong> b) Ammonium nitrate
Explanation:<\/strong> Ammonium nitrate is used in explosives and fertilizers.<\/p>\n\n\n\n

31. The Haber process is used in fertilizer industry for the production of:<\/mark><\/strong>
a) Urea
b) Ammonia
c) Superphosphate
d) Nitric acid
Answer:<\/strong> b) Ammonia
Explanation:<\/strong> Haber process \u2192 N\u2082 + 3H\u2082 \u2192 2NH\u2083 (at high pressure & catalyst).<\/p>\n\n\n\n

32. The raw materials for urea production are:<\/mark><\/strong>
a) NH\u2083 and H\u2082SO\u2084
b) NH\u2083 and HNO\u2083
c) NH\u2083 and CO\u2082
d) NH\u2083 and CaCO\u2083
Answer:<\/strong> c) NH\u2083 and CO\u2082
Explanation:<\/strong> Urea is manufactured from ammonia and carbon dioxide.<\/p>\n\n\n\n

33. Which fertilizer is obtained by treating phosphate rock with H\u2082SO\u2084?<\/mark><\/strong>
a) Superphosphate
b) DAP
c) Triple superphosphate
d) Ammonium phosphate
Answer:<\/strong> a) Superphosphate
Explanation:<\/strong> Ca\u2083(PO\u2084)\u2082 + H\u2082SO\u2084 \u2192 Ca(H\u2082PO\u2084)\u2082 + CaSO\u2084.<\/p>\n\n\n\n

34. Triple superphosphate (TSP) contains about:<\/mark><\/strong>
a) 16% P\u2082O\u2085
b) 20% P\u2082O\u2085
c) 45% P\u2082O\u2085
d) 60% P\u2082O\u2085
Answer:<\/strong> c) 45% P\u2082O\u2085
Explanation:<\/strong> TSP has a high phosphate content compared to normal superphosphate.<\/p>\n\n\n\n

35. Rock phosphate is mainly:<\/mark><\/strong>
a) Ca\u2083(PO\u2084)\u2082
b) CaSO\u2084
c) CaCO\u2083
d) Mg\u2083(PO\u2084)\u2082
Answer:<\/strong> a) Ca\u2083(PO\u2084)\u2082
Explanation:<\/strong> Rock phosphate is tricalcium phosphate, treated with acids to make fertilizers.<\/p>\n\n\n\n

36. Diammonium phosphate (DAP) is manufactured by:<\/mark><\/strong>
a) NH\u2083 + CO\u2082
b) NH\u2083 + H\u2083PO\u2084
c) NH\u2083 + H\u2082SO\u2084
d) NH\u2083 + HNO\u2083
Answer:<\/strong> b) NH\u2083 + H\u2083PO\u2084
Explanation:<\/strong> DAP contains ~18% N and ~46% P\u2082O\u2085.<\/p>\n\n\n\n

37. Which phosphatic fertilizer is water-soluble?<\/mark><\/strong>
a) Rock phosphate
b) Superphosphate
c) DAP
d) Both b and c
Answer:<\/strong> d) Both b and c
Explanation:<\/strong> Superphosphate and DAP are water-soluble and easily absorbed.<\/p>\n\n\n\n

38. Potassium chloride (MOP) contains about:<\/mark><\/strong>
a) 30% K\u2082O
b) 40% K\u2082O
c) 50% K\u2082O
d) 60% K\u2082O
Answer:<\/strong> d) 60% K\u2082O
Explanation:<\/strong> Muriate of Potash (KCl) has ~60% K\u2082O equivalent.<\/p>\n\n\n\n

39. Potassium sulphate (SOP) contains about:<\/mark><\/strong>
a) 25% K\u2082O
b) 40% K\u2082O
c) 50% K\u2082O
d) 60% K\u2082O
Answer:<\/strong> c) 50% K\u2082O
Explanation:<\/strong> SOP provides ~50% K\u2082O and is chloride-free (preferred for sensitive crops).<\/p>\n\n\n\n

40. Which of the following is a chloride-free potassic fertilizer?<\/mark><\/strong>
a) KCl
b) K\u2082SO\u2084
c) KNO\u2083
d) Both b and c
Answer:<\/strong> d) Both b and c
Explanation:<\/strong> SOP (K\u2082SO\u2084) and KNO\u2083 do not contain chloride.<\/p>\n\n\n\n

41. Which fertilizer is known as \u201cprilled urea\u201d?<\/mark><\/strong>
a) Urea in small spherical form
b) Granulated urea
c) Liquid urea
d) Coated urea
Answer:<\/strong> a) Urea in small spherical form
Explanation:<\/strong> Prilled urea = tiny spherical solid particles.<\/p>\n\n\n\n

42. Neem-coated urea is used to:<\/mark><\/strong>
a) Increase N content
b) Reduce leaching losses
c) Increase solubility
d) Supply sulfur
Answer:<\/strong> b) Reduce leaching losses
Explanation:<\/strong> Neem coating slows down nitrogen release and reduces wastage.<\/p>\n\n\n\n

43. Which fertilizer is used in acidic soils to neutralize acidity?<\/mark><\/strong>
a) Ammonium sulphate
b) Superphosphate
c) Basic slag (Ca-silicate)
d) Urea
Answer:<\/strong> c) Basic slag (Ca-silicate)
Explanation:<\/strong> Basic slag adds lime and reduces soil acidity.<\/p>\n\n\n\n

44. Which is the cheapest source of nitrogen fertilizer?<\/mark><\/strong>
a) Urea
b) Ammonium sulphate
c) Ammonium nitrate
d) Calcium ammonium nitrate
Answer:<\/strong> a) Urea
Explanation:<\/strong> Urea has highest N% and lowest cost per kg N.<\/p>\n\n\n\n

45. Which fertilizer is best suited for paddy fields?<\/mark><\/strong>
a) Urea
b) Ammonium sulphate
c) Calcium ammonium nitrate
d) Potassium chloride
Answer:<\/strong> b) Ammonium sulphate
Explanation:<\/strong> In flooded soils, ammonium form is more stable than nitrate.<\/p>\n\n\n\n

46. Which fertilizer is highly hygroscopic and used as liquid fertilizer?<\/mark><\/strong>
a) Ammonium nitrate
b) Urea
c) Calcium nitrate
d) Ammonium sulphate
Answer:<\/strong> c) Calcium nitrate
Explanation:<\/strong> Calcium nitrate is soluble and often used in liquid form.<\/p>\n\n\n\n

47. The main raw material for phosphatic fertilizers is:<\/mark><\/strong>
a) Rock phosphate
b) Gypsum
c) Limestone
d) Dolomite
Answer:<\/strong> a) Rock phosphate
Explanation:<\/strong> Rock phosphate (Ca\u2083(PO\u2084)\u2082) is the basis for superphosphate and DAP.<\/p>\n\n\n\n

48. Which fertilizer is produced by Ostwald process (via nitric acid)?<\/mark><\/strong>
a) Ammonium sulphate
b) Ammonium nitrate
c) Urea
d) DAP
Answer:<\/strong> b) Ammonium nitrate
Explanation:<\/strong> NH\u2083 \u2192 HNO\u2083 (Ostwald) \u2192 NH\u2084NO\u2083.<\/p>\n\n\n\n

49. Which fertilizer releases nitrogen slowly and continuously?<\/mark><\/strong>
a) Neem-coated urea
b) Ammonium nitrate
c) Urea
d) CAN
Answer:<\/strong> a) Neem-coated urea
Explanation:<\/strong> Slow-release reduces losses and increases efficiency.<\/p>\n\n\n\n

50. Which fertilizer is especially suitable for tobacco crops (sensitive to chloride)?<\/mark><\/strong>
a) KCl
b) K\u2082SO\u2084 (SOP)
c) MOP
d) None
Answer:<\/strong> b) K\u2082SO\u2084 (SOP)
Explanation:<\/strong> Chloride damages tobacco \u2192 use sulfate of potash.<\/p>\n\n\n\n

51. A complex fertilizer contains:<\/mark><\/strong>
a) Only one primary nutrient
b) Two or more primary nutrients
c) Only secondary nutrients
d) Only organic matter
Answer:<\/strong> b) Two or more primary nutrients
Explanation:<\/strong> Complex fertilizers supply N, P, and\/or K together (e.g., NPK, DAP).<\/p>\n\n\n\n

52. Which of the following is a complex fertilizer?<\/mark><\/strong>
a) Urea
b) Diammonium phosphate (DAP)
c) Ammonium nitrate
d) Superphosphate
Answer:<\/strong> b) Diammonium phosphate (DAP)
Explanation:<\/strong> DAP provides both nitrogen and phosphorus.<\/p>\n\n\n\n

53. NPK fertilizer contains:<\/mark><\/strong>
a) Only nitrogen
b) Only phosphorus
c) Nitrogen, phosphorus, and potassium
d) Nitrogen and calcium
Answer:<\/strong> c) Nitrogen, phosphorus, and potassium
Explanation:<\/strong> NPK fertilizers supply all three primary nutrients.<\/p>\n\n\n\n

54. Which fertilizer is considered a straight fertilizer?<\/mark><\/strong>
a) Urea
b) NPK mixture
c) DAP
d) Nitro-phosphate
Answer:<\/strong> a) Urea
Explanation:<\/strong> Straight fertilizers supply only one nutrient (e.g., urea for N).<\/p>\n\n\n\n

55. Which of the following is an example of a mixed fertilizer?<\/mark><\/strong>
a) Urea
b) NPK mixture prepared mechanically
c) DAP
d) Superphosphate
Answer:<\/strong> b) NPK mixture prepared mechanically
Explanation:<\/strong> Mixed fertilizers are prepared by blending straight fertilizers.<\/p>\n\n\n\n

56. A fertilizer containing secondary nutrient is:<\/mark><\/strong>
a) Urea
b) Ammonium sulphate
c) Gypsum
d) Superphosphate
Answer:<\/strong> c) Gypsum
Explanation:<\/strong> Gypsum supplies calcium (Ca)<\/strong> and sulphur (S)<\/strong>, which are secondary nutrients.<\/p>\n\n\n\n

57. Sulphur deficiency in plants leads to:<\/mark><\/strong>
a) Delayed flowering
b) Yellowing of young leaves
c) Poor fruit setting
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> Sulphur is essential for protein and oil formation.<\/p>\n\n\n\n

58. Which fertilizer supplies magnesium?<\/mark><\/strong>
a) Dolomite
b) Gypsum
c) Urea
d) DAP
Answer:<\/strong> a) Dolomite
Explanation:<\/strong> Dolomite (CaMg(CO\u2083)\u2082) provides calcium and magnesium.<\/p>\n\n\n\n

59. Zinc deficiency in plants causes:<\/mark><\/strong>
a) Chlorosis
b) Poor grain filling
c) Little leaf disease in rice
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> Zn is essential for enzyme activity and growth hormones.<\/p>\n\n\n\n

60. Boron deficiency in plants causes:<\/mark><\/strong>
a) Poor root development
b) Poor fruit and seed setting
c) Death of shoot tips
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> Boron is important for cell wall formation and reproduction.<\/p>\n\n\n\n

61. Which micronutrient fertilizer contains zinc?
<\/mark><\/strong>a) Zinc sulphate
b) Magnesium sulphate
c) Borax
d) Gypsum
Answer:<\/strong> a) Zinc sulphate
Explanation:<\/strong> ZnSO\u2084 is commonly used to correct zinc deficiency.<\/p>\n\n\n\n

62. Which micronutrient fertilizer is used to correct iron deficiency?<\/mark><\/strong>
a) FeSO\u2084
b) Borax
c) Gypsum
d) ZnSO\u2084
Answer:<\/strong> a) FeSO\u2084
Explanation:<\/strong> Ferrous sulphate supplies iron.<\/p>\n\n\n\n

63. Biofertilizers are:<\/mark><\/strong>
a) Chemical fertilizers
b) Organic manures
c) Microorganisms that enhance nutrient availability
d) Micronutrients
Answer:<\/strong> c) Microorganisms that enhance nutrient availability
Explanation:<\/strong> Biofertilizers include bacteria, fungi, and algae.<\/p>\n\n\n\n

64. Which bacteria fix nitrogen in leguminous plants?<\/mark><\/strong>
a) Azotobacter
b) Rhizobium
c) Clostridium
d) Nitrosomonas
Answer:<\/strong> b) Rhizobium
Explanation:<\/strong> Rhizobium forms nodules on legume roots and fixes nitrogen symbiotically.<\/p>\n\n\n\n

65. Which free-living bacteria fixes nitrogen in soil?<\/mark><\/strong>
a) Nitrosomonas
b) Nitrobacter
c) Azotobacter
d) Thiobacillus
Answer:<\/strong> c) Azotobacter
Explanation:<\/strong> Azotobacter is a free-living nitrogen fixer in soil.<\/p>\n\n\n\n

66.<\/strong> Blue-green algae (cyanobacteria) act as biofertilizers by:<\/strong><\/mark>
<\/strong>a) Adding nitrogen
b) Adding phosphorus
c) Adding potassium
d) Adding calcium
Answer:<\/strong> a) Adding nitrogen
Explanation:<\/strong> Cyanobacteria (like Anabaena, Nostoc) fix atmospheric nitrogen.<\/p>\n\n\n\n

67. Which biofertilizer is commonly used in paddy fields?<\/mark><\/strong>
a) Azotobacter
b) Blue-green algae
c) Mycorrhiza
d) Azospirillum
Answer:<\/strong> b) Blue-green algae
Explanation:<\/strong> BGA fix nitrogen and are widely used in rice fields.<\/p>\n\n\n\n

68. Mycorrhizal fungi help plants by:<\/mark><\/strong>
a) Fixing nitrogen
b) Increasing phosphorus absorption
c) Increasing potassium absorption
d) Providing sulphur
Answer:<\/strong> b) Increasing phosphorus absorption
Explanation:<\/strong> Mycorrhizae enhance uptake of P and water.<\/p>\n\n\n\n

69. Phosphate solubilizing bacteria (PSB) improve availability of:<\/mark><\/strong>
a) Nitrogen
b) Phosphorus
c) Potassium
d) Sulphur
Answer:<\/strong> b) Phosphorus
Explanation:<\/strong> PSB make insoluble phosphates available to plants.<\/p>\n\n\n\n

70. Which of the following is a potassium-mobilizing biofertilizer?<\/mark><\/strong>
a) Bacillus mucilaginosus
b) Azotobacter
c) Rhizobium
d) Nostoc
Answer:<\/strong> a) Bacillus mucilaginosus
Explanation:<\/strong> These bacteria release K from soil minerals.<\/p>\n\n\n\n

71. Which fertilizer supplies both nitrogen and sulfur?<\/mark><\/strong>
a) Ammonium sulphate
b) Urea
c) Superphosphate
d) Ammonium nitrate
Answer:<\/strong> a) Ammonium sulphate
Explanation:<\/strong> (NH\u2084)\u2082SO\u2084 contains ~21% N and ~24% S.<\/p>\n\n\n\n

72. Which micronutrient deficiency causes \u201cwhip-tail disease\u201d in cauliflower?<\/mark><\/strong>
a) Iron
b) Zinc
c) Boron
d) Molybdenum
Answer:<\/strong> d) Molybdenum
Explanation:<\/strong> Mo deficiency causes whip-tail in cauliflower.<\/p>\n\n\n\n

73. Which micronutrient is provided by Borax fertilizer?<\/mark><\/strong>
a) Copper
b) Zinc
c) Boron
d) Molybdenum
Answer:<\/strong> c) Boron
Explanation:<\/strong> Borax (Na\u2082B\u2084O\u2087\u00b710H\u2082O) supplies boron.<\/p>\n\n\n\n

74. Copper deficiency in plants is corrected by:<\/mark><\/strong>
a) CuSO\u2084
b) ZnSO\u2084
c) Borax
d) FeSO\u2084
Answer:<\/strong> a) CuSO\u2084
Explanation:<\/strong> Copper sulphate supplies copper as a micronutrient.<\/p>\n\n\n\n

75. Which biofertilizer produces growth-promoting substances like auxins and vitamins?<\/mark><\/strong>
a) Azospirillum
b) Rhizobium
c) Nostoc
d) Mycorrhiza
Answer:<\/strong> a) Azospirillum
Explanation:<\/strong> Azospirillum promotes nitrogen fixation and plant growth hormones.<\/p>\n\n\n\n

76. Excessive use of nitrogen fertilizers causes:<\/mark><\/strong>
a) Soil fertility increase indefinitely
b) Nitrate pollution of groundwater
c) Elimination of soil microorganisms
d) None of the above
Answer:<\/strong> b) Nitrate pollution of groundwater
Explanation:<\/strong> Excess nitrates leach into groundwater \u2192 harmful to humans (blue baby syndrome).<\/p>\n\n\n\n

77. Overuse of fertilizers leads to:<\/mark><\/strong>
a) Soil acidification
b) Soil salinity
c) Eutrophication of water bodies
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> Fertilizer misuse degrades soil and water quality.<\/p>\n\n\n\n

78. Eutrophication is caused mainly by excess:<\/mark><\/strong>
a) Nitrogen and phosphorus fertilizers
b) Potassium fertilizers
c) Calcium fertilizers
d) Sulphur fertilizers
Answer:<\/strong> a) Nitrogen and phosphorus fertilizers
Explanation:<\/strong> Nutrient enrichment causes algal blooms in water.<\/p>\n\n\n\n

79. Which disease is linked with nitrate-contaminated water?<\/mark><\/strong>
a) Malaria
b) Blue baby syndrome (methemoglobinemia)
c) Typhoid
d) Goitre
Answer:<\/strong> b) Blue baby syndrome (methemoglobinemia)
Explanation:<\/strong> Nitrates reduce oxygen-carrying capacity of blood in infants.<\/p>\n\n\n\n

80. Which gas is released from soils rich in nitrogen fertilizers?<\/mark><\/strong>
a) CO\u2082
b) CH\u2084
c) N\u2082O
d) O\u2083
Answer:<\/strong> c) N\u2082O
Explanation:<\/strong> Nitrous oxide is a greenhouse gas emitted from nitrogen fertilizer use.<\/p>\n\n\n\n

81. Which fertilizer contributes most to soil salinity?<\/mark><\/strong>
a) Urea
b) Ammonium sulphate
c) Sodium nitrate
d) Potassium nitrate
Answer:<\/strong> c) Sodium nitrate
Explanation:<\/strong> Sodium salts accumulate, causing salinity.<\/p>\n\n\n\n

82. Which of the following improves fertilizer use efficiency?
<\/mark><\/strong>a) Neem-coated urea
b) Drip irrigation with soluble fertilizers
c) Slow-release fertilizers
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> All methods reduce nutrient loss and increase efficiency.<\/p>\n\n\n\n

83. The term \u201cfertilizer use efficiency\u201d means:<\/mark><\/strong>
a) % of applied nutrient taken up by crop
b) Amount of fertilizer lost in soil
c) Total fertilizer used
d) Yield per hectare
Answer:<\/strong> a) % of applied nutrient taken up by crop
Explanation:<\/strong> Efficiency = nutrient absorbed \u00f7 nutrient applied \u00d7 100.<\/p>\n\n\n\n

84. Controlled-release fertilizers are designed to:<\/mark><\/strong>
a) Release nutrients quickly
b) Release nutrients slowly over time
c) Not release nutrients
d) Eliminate all losses
Answer:<\/strong> b) Release nutrients slowly over time
Explanation:<\/strong> Controlled-release reduces leaching and volatilization losses.<\/p>\n\n\n\n

85. Foliar application of fertilizers means:<\/mark><\/strong>
a) Spraying fertilizer solution on leaves
b) Mixing fertilizer in irrigation water
c) Broadcasting in soil
d) Placing fertilizer deep in soil
Answer:<\/strong> a) Spraying fertilizer solution on leaves
Explanation:<\/strong> Foliar feeding provides quick nutrient supply to plants.<\/p>\n\n\n\n

86. Fertigation means:<\/mark><\/strong>
a) Mixing fertilizers with compost
b) Application of fertilizers through irrigation water
c) Applying fertilizers before sowing
d) Foliar spraying
Answer:<\/strong> b) Application of fertilizers through irrigation water
Explanation:<\/strong> Fertigation is used in drip irrigation systems.<\/p>\n\n\n\n

87. Which is the most energy-intensive fertilizer to produce?<\/mark><\/strong>
a) Urea
b) Ammonium sulphate
c) DAP
d) Potash
Answer:<\/strong> a) Urea
Explanation:<\/strong> Urea requires large amounts of energy (natural gas) for NH\u2083 production.<\/p>\n\n\n\n

88. Which nutrient\u2019s overuse causes lodging in cereals?<\/mark><\/strong>
a) Nitrogen
b) Phosphorus
c) Potassium
d) Sulphur
Answer:<\/strong> a) Nitrogen
Explanation:<\/strong> Excess nitrogen causes tall, weak stems prone to lodging.<\/p>\n\n\n\n

89. Integrated nutrient management (INM) involves:<\/mark><\/strong>
a) Use of only chemical fertilizers
b) Use of only organic manure
c) Combination of chemical fertilizers, organic manures, and biofertilizers
d) Only irrigation
Answer:<\/strong> c) Combination of chemical fertilizers, organic manures, and biofertilizers
Explanation:<\/strong> INM balances productivity and sustainability.<\/p>\n\n\n\n

90. Which fertilizer is preferred for acidic soils?<\/mark><\/strong>
a) Ammonium sulphate
b) Basic slag
c) Urea
d) Superphosphate
Answer:<\/strong> b) Basic slag
Explanation:<\/strong> Basic slag neutralizes acidity while supplying Ca and P.<\/p>\n\n\n\n

91. Which fertilizer is preferred for alkaline soils?<\/mark><\/strong>
a) Gypsum
b) Sodium nitrate
c) Potassium chloride
d) Lime
Answer:<\/strong> a) Gypsum
Explanation:<\/strong> Gypsum corrects sodicity (alkalinity) by replacing Na\u207a with Ca\u00b2\u207a.<\/p>\n\n\n\n

92. Which of the following helps in reducing ammonia volatilization losses from urea?<\/mark><\/strong>
a) Deep placement in soil
b) Neem-coating
c) Irrigating after application
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> Proper management practices minimize losses.<\/p>\n\n\n\n

93. Nano-fertilizers are:<\/mark><\/strong>
a) Large fertilizer granules
b) Fertilizers with particle size <100 nm
c) Only organic fertilizers
d) Biofertilizers
Answer:<\/strong> b) Fertilizers with particle size <100 nm
Explanation:<\/strong> Nano-fertilizers increase efficiency and reduce losses.<\/p>\n\n\n\n

94. Which nutrient is most responsible for greenhouse gas emissions from <\/mark><\/strong>fertilizers?
a) N (Nitrogen)
b) P (Phosphorus)
c) K (Potassium)
d) Ca (Calcium)
Answer:<\/strong> a) N (Nitrogen)
Explanation:<\/strong> Nitrogen fertilizers release nitrous oxide (N\u2082O), a potent greenhouse gas.<\/p>\n\n\n\n

95. Which fertilizer is best for oilseed crops (rich in proteins)?<\/strong><\/mark>
a) Potash fertilizers
b) Sulphur-containing fertilizers
c) Phosphate fertilizers
d) Urea
Answer:<\/strong> b) Sulphur-containing fertilizers
Explanation:<\/strong> Sulphur is essential for oil and protein synthesis.<\/p>\n\n\n\n

96. Which fertilizer can be used as an explosive as well as fertilizer?<\/mark><\/strong>
a) Ammonium sulphate
b) Ammonium nitrate
c) Urea
d) Calcium nitrate
Answer:<\/strong> b) Ammonium nitrate
Explanation:<\/strong> Ammonium nitrate has dual use (fertilizer + explosive).<\/p>\n\n\n\n

97. Which is considered the most balanced chemical fertilizer?<\/mark><\/strong>
a) Urea
b) DAP
c) NPK mixture
d) Ammonium sulphate
Answer:<\/strong> c) NPK mixture
Explanation:<\/strong> NPK supplies all three primary nutrients.<\/p>\n\n\n\n

98. Which fertilizer is also called \u201cMurphy\u2019s fertilizer\u201d for tobacco and potato crops?<\/mark><\/strong>
a) Potassium sulphate (SOP)
b) Ammonium sulphate
c) Urea
d) Superphosphate
Answer:<\/strong> a) Potassium sulphate (SOP)
Explanation:<\/strong> SOP is chloride-free and suitable for sensitive crops like potato and tobacco.<\/p>\n\n\n\n

99. The term \u201cbalanced fertilization\u201d refers to:<\/mark><\/strong>
a) Applying maximum nitrogen
b) Applying nutrients in proportion to crop requirement
c) Applying only organic manure
d) Applying fertilizers every week
Answer:<\/strong> b) Applying nutrients in proportion to crop requirement
Explanation:<\/strong> Balanced fertilization avoids deficiency and excess of nutrients.<\/p>\n\n\n\n

100. Which sustainable alternative can reduce chemical fertilizer dependency?<\/mark><\/strong>
a) Compost and green manure
b) Biofertilizers
c) Integrated nutrient management (INM)
d) All of the above
Answer:<\/strong> d) All of the above
Explanation:<\/strong> Combining organic, bio, and chemical sources ensures sustainability.<\/p>\n","protected":false},"excerpt":{"rendered":"

1. Fertilizers are substances used to:a) Increase soil acidityb) Supply nutrients to plantsc) Kill insectsd) Reduce water contentAnswer: b) Supply nutrients to plantsExplanation: Fertilizers enrich soil with essential nutrients for plant growth. 2. Which element is known as the \u201cKing of Fertilizers\u201d?a) Phosphorusb) Potassiumc) Nitrogend) CalciumAnswer: c) NitrogenExplanation: Nitrogen is required in largest quantity and<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[16054,16055,16045,15886,15892,15876,15898,15901,15887,15899,15879,15883,16053,16046,16049,16043,10976,15897,5649,5623,16044,16051,16050,16047,16052,16042,15900,16056,15896,16048,15894],"class_list":{"0":"post-12793","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-chemistry","7":"tag-agricultural-chemistry","8":"tag-biofertilizers","9":"tag-chemical-fertilizers","10":"tag-chemistry-formulas","11":"tag-chemistry-learning","12":"tag-chemistry-mcqs","13":"tag-chemistry-preparation-material","14":"tag-chemistry-questions-and-answers","15":"tag-chemistry-quiz","16":"tag-chemistry-revision","17":"tag-chemistry-study-material","18":"tag-competitive-exam-chemistry","19":"tag-fertilizer-application","20":"tag-fertilizer-problems","21":"tag-fertilizer-production","22":"tag-fertilizers-in-chemistry","23":"tag-fertilizers-top-100-mcqs-with-answer-and-explanation","24":"tag-mcqs-for-chemistry-exam","25":"tag-mcqs-for-pc-psi-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-exams","26":"tag-mcqs-for-sda-fda-pdo-vao-banking-kas-ias-ssc-gd-ssc-chsl-ssc-cgl-for-all-compitative-exams","27":"tag-nitrogen-fertilizers","28":"tag-npk-fertilizers","29":"tag-organic-fertilizers","30":"tag-phosphatic-fertilizers","31":"tag-plant-nutrition","32":"tag-potassic-fertilizers","33":"tag-psc-chemistry-mcqs","34":"tag-soil-nutrients","35":"tag-ssc-chemistry-mcqs","36":"tag-types-of-fertilizers","37":"tag-upsc-chemistry-mcqs"},"_links":{"self":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/12793","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/comments?post=12793"}],"version-history":[{"count":3,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/12793\/revisions"}],"predecessor-version":[{"id":12948,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/12793\/revisions\/12948"}],"wp:attachment":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/media?parent=12793"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/categories?post=12793"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/tags?post=12793"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}