soil science MCQs – Page 4

Practise focused soil science questions with marked answers for exam preparation and subject revision.

soil science Mcqs
61. Ca, Mg, S are called__________?
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A. Primary nutrients

B. Minor nutrients

C. Excellent nutrients

D. None of these
62. During decomposition of organic matter, inititial decomposition is dominated by:__________?
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A. Actinomycetes

B. Bacteria

C. Fungi

D. Both B & C

63. Each layer of phyllosilicates is composed of two types of sheets:
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A. Tetrahedral sheet

B. Triple octahedral sheet

C. Octahedral sheet

D. Both A & C
64. Browning disease of rice is a_________?
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A. Viral disease

B. Bacterial & fungal disease

C. Physiological disease

D. The above statement is wrong

65. The dominance of acidity creates toxicity?
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A. Mg

B. Mo

C. Al

D. Zn

66. What is Vesicular Arbuscular Mycorrhiza (VAM)?
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A. Bacteria

B. Fungi

C. both A & B

D. None of the above

67. Composition of igneous rock is determined by___________?
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A. Depth of molten magma

B. Composition of molten magma

C. Both A and B

D. Composition can not be determined.

68. ___________ , considered a perfect soil, is a mixture of silt, clay and sand:
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A. Loam

B. Loamy sand

C. Sandy loam

D. Clay

69. Phosphorus (P) is the second major nutrient essential for plant growth. With the exception of Nitrogen (N) and Potassium (K), Phosphorus is required by plants in_________?
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A. Greater quantities

B. Not required

C. Lesser quantities

D. The above statement is wrong

70. In Pakistan, Indus plains are formed from ___________ parent material which was transported by Indus river and its tributaries from Himalayas?
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A. Colluvial

B. None of the above

C. Moraine

D. Till

71. The most suitable species for reclamation of sandy soils is:_________?
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A. Casuarina equiselifolia

B. Acacia spp

C. All of the above

D. Azadirachta indica
72. ______________ consist of particles that are produced by disintegration of pre-existing rocks through the process of weathering:
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A. Clastics

B. Non-clastics

C. both A & B

D. None of the above

73. International Union of Soil Sciences(IUSS),foundedin___________?
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A. 1824

B. 1724

C. . 1924

D. 1624

74. 1 bar is equal to_________?
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A. 0.9869 atm

B. All of these

C. Wt. Of a 1020 cm water column

D. 75.01 cm high mercury column

75. Accumulation of soluble salts in soil________?
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A. All off these

B. Desalinization

C. Alkalization

D. Salinization
76. The percentage of calcium content in single superphosphate?
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A. 19.5%

B. 24%

C. 30%

D. 25%

77. The soil air contains a number of gases ______________ & water vapours:
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A. Carbon dioxide

B. Nitrogen

C. Oxygen

D. All of the above
78. International day of forest is celebrated on___________?
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A. None of the above

B. 15-Mar

C. 3-Mar

D. March-21
79. Exposure of the manures to rains causes highest loss of___________?
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A. P

B. Cl

C. N

D. Cu

80. In Pakistan, Nitrophos is manufactured in_________?
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A. Sawat

B. Shikarpoor

C. Lasbella

D. Multan