soil science MCQs – Page 9

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

soil science Mcqs

161. The soils in which the weathered material is taken away to other place by several agents are called__________?
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A. Transported soil

B. Aeolian soil

C. Alluvial soil

D. None of these

162. Which of the following soil has the highest water holding capacity_________?
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A. Sand soil

B. Silt soil

C. None of these

D. Forest soil

163. In Pakistan there is general deficiency of rainfall. It varies from 125 mm annually in upper Sindh to about 900 mm in the sub-mountainous of northern Pakistan. In Balochistan the mean annual rainfall is about 200 mm, diminishing to ________ mm in the desert of Kharan:
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A. >70 mm

B. None of these

C.

D. 100 mm

164. New soils, no or little profile development:
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A. Aridisols

B. Inceptisols

C. Entisols

D. Andisols

165. Inceptisols:___________?
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A. Young soils with few horizons

B. Organic soils

C. Dry soils

D. Volcanic soils

166. Soil pores created by the animal such as earthworm and plant root are called_________?
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A. Diameter

B. Biopores

C. Mesopores

D. Microspores

167. Soil erosion is __________ of soil from one place ti another place by natural agencies (wind & water):
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A. Detachement of soil

B. Transportation

C. both A & B

D. None of these

168. Who will decompose organic matter first:
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A. Basidiomycetes

B. Bacteria

C. Fungi imperfecti

D. Actinomycetes

169. Rhizoplane is________?
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A. Root surface

B. Area within the roots

C. An area of soil from root surface to 5 cm

D. All of them

170. Which one of the following clay mineral has the highest CEC?
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A. Montmorillonite

B. Vermiculite

C. Kaolinite

D. Illite

171. The horizons O, A, E and B (other than r and C) are collectively called_____________?
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A. inner core

B. Solum

C. Regolith

D. Outer core

172. Organic matter decomposes rapidly in Pakistani soils because of ____________ conditions, that is why our soils generally have < 1% organic matter:
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A. High temperature

B. Alkaline

C. Both a & b

D. None of a & b

173. Soil erosion Occurs mainly in:_________?
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A. Inceptisols, Mollisols

B. Alfisols, Entisols

C. Both a & b

D. None of the above

174. Peat soils are not present in Pakistan because these are formed in___________?
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A. Cool climate

B. Acidic conditions

C. both A & B

D. None of the above

175. Specific heat is higher in:
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A. Clay

B. Humus

C. both A & B

D. Only Clay

176. The basic form of present day Universal soil loss equation (USLE), initially involved the use of factors such as ________?
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A. R, K, S and L

B. R, K and S

C. R and K

D. R, K, S, L, C and P

177. In cotton, zn deficiency is known as_________?
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A. None of these

B. Mottle leaf

C. Fern leaf

D. Little leaf

178. What is the optimum temperature and pH for nitrifying bacteria ?
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A. All of thses

B. 30-35 c, pH 5.5

C. 25-40 c, pH 8-8.5

D. >35 c, pH less than 5

179. From the point of view of crop production, Soil testing refers to______________?
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A. Laboratory analysis assessing plant available nutrient status

B. Collection of plant leaves samples only

C. Salinity & elemental toxicity of a soil

D. Both A & C

180. Weathering process-physical, chemical, and biological _______________, the rocks and minerals into simpler products which either accumulate in place or are transported to other places where they become soil parent materials?
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A. Disintegrate

B. Disentigrate

C. Decompose

D. Both a & c

Showing 161 to 180 of 503 mcqs