soil science MCQs – Page 13

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

soil science Mcqs

241. Most common rocks, after exposed to weathering which cover about ______% 0f the earth:
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A. Igneous rocks

B. metamorphic rocks

C. Shales

D. Sedimentary rocks

242. The tree sends down roots from its branches to the soil is know as:_______?
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A. Pine

B. Oak

C. Banyan

D. Palm

243. Which of the following is not a metamorphic rock?
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A. Marble

B. Granite

C. Sand stone

D. both A & B

244. Which of the following crops is most tolerant to salty soils?
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A. Carrot

B. Rice

C. Cotton

D. Corn

245. What is the formula of urea?
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A. None of these

B. NH2-CO-NH-CO-NH2

C. (NH4)2CO3

D. CO (NH2)2

246. The mineral component of soil consists of_________?
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A. Air

B. Water

C. both A and B

D. none of the above

247. Sustainable Technologies to Control Water-Logging:
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A. Planting of eucalyptus in water-logged areas.

B. Installation of tube-wells for irrigation and vertical drainage.

C. All of these

D. Planning and designing of future canals on proper lines.

248. A mineral horizon that is either too thin, too light in colour, too low in organic matter:
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A. Mollic epipedon

B. Ochric epipedon

C. Umbric epipedon

D. Melanic epipedon

249. Pedogenic processes bring about changes in the parent materials in the form of _____________________, within the soil body (soil profile)?
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A. Additions, losses

B. Transfers and transformations

C. both A and B

D. None of the above

250. Association of two microorganisms in which one is benefited while other remains unaffected is known as:________?
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A. Ammensalism

B. This statement is wrong

C. Commensalism

D. Competetion

251. Source of negative charges on silicate clays is/ are________?
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A. Isomorphous substitution

B. All of these

C. Anion exchange

D. Exposed crystal edges

252. There are twelve soil orders found in the world of which six soil orders have been recognized at various locations are________?
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A. Andisols, Gelisols, Histosols, Spodosols, Oxisols, Ultisols

B. The above statement is wrong

C. Andisols, Aridisols, Histosols, Vertisols, Regosols, Libosols

D. Entisols, Inceptisols, Aridisols, Alfisols, Mollisols, Vertisols

253. Following are types if erosion:
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A. All of these

B. Rill & Gully erosion

C. Normal (geological) erosion & Accelerated erosion

D. Rain splash & sheet erosion

254. According to a latest research, Pakistan is predominantly a dryland country; 80% of its land area is arid and semi arid, 12% sub-humid and 8% under humid climate. Thus , soils of arid & semi-arid regions are vulnerable to a wide range of degradation process. As the case in arid and semi-arid climates elsewhere in south-central/southern Asia and Sub-Saharan Africa; _________________ are among the major causes of soil degradation and desertification?
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A. Accelerated erosion & salinization

B. All of the above

C. Drought stress

D. Depletion of soil fertility and SOM

255. Which one of the following techniques is used for assessing available P in soil and does not include growing plants:
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A. a-Value

B. A-Value

C. E-Value

D. L-Value

256. Surface removal of ice or snow from a glacier or snowfield by melting, sublimation, and/ or calving:
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A. Bank-Caving

B. Ablation

C. Abrasion

D. Backplain

257. The movement of water through a column of soil is called:___________?
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A. Leaching

B. Percolation

C. Infiltration

D. hydraulic conductivity

258. An intrazonal group of dark calcareous soils high in clay and having mainly montmorillonitic type clay are called as:________?
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A. Regur

B. Montmorillosol

C. Regosol

D. Ragour

259. Which chemical used to prevent evaporation from surface of water in water bodies?
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A. Cetyle alcohol

B. Methyle alcohol

C. both A and B

D. None of these

260. The planned development, distribution and use water resources:
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A. Water distribution

B. Water management

C. both A & B

D. None of the above

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