soil science MCQs – Page 12

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

soil science Mcqs

221. What is a soil horizon?
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A. All of these

B. Soil structure

C. Soil texture

D. Layers of soil

222. Roots usually occupy :__________?
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A. 1% or less of soil volume

B. 30% or less of soil volume

C. 10% or less of soil volume

D. 20% or less of soil volume

223. In low-rainfall areas, huge shifting sand dunes are commonly found, particularly near human habitations. Techniques of afforesting the shifting dunes needed to be implemented. These techniques consist of___________?
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A. Treatment of shifting sand-dunes by fixing barriers in parallel stripes or in a chess-board design, using the local shrub material starting from the crest of the dunes to protect the seedlings from burial or exposure by the blowing of sand.

B. Protection against biotic interference

C. Both a & b

D. None of these

224. Which element is known as chemical police man of plant?
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A. All of the above

B. Potassium

C. Phosphorus

D. Magnesium

225. _________ erosion is the removal of a thin layer of soil by water acting over the whole surface. This type of erosion damaged very fertile lands located on slopes, some of which have been eroded to a depth of about 15 cm.
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A. Stream bank erosion

B. Rain splash rill erosion

C. Sheet erosion

D. Gully erosion

226. 1 mg of H+ will be equal to_________?
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A. 12 mg of Mg2+

B. 20 mg of ca2+

C. 9 mg of Al3+

D. All of the above

227. Principles of soil conservation does not include:
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A. Construction of mini dams & ponds to store water for live stock & other porposes

B. Use non-arable lands effectively

C. Minimize run-off & store surplus water

D. Leave barren lands uncultivable to support desrtification degradation

228. Fe, Zn, Mn, Mo, Co, Ni, Cu, are also called __________:
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A. Micro elements

B. Trace elements

C. Both A & B

D. None of these

229. Availability of Zn is higher to crops in:_________?
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A. Sodic soils

B. Acid soils

C. Saline soils

D. Saline-sodic soils

230. Accumulation of Al and Fe oxides and clays coming from the upper profile layers:
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A. Zone of evaluation

B. Zone of eluviation

C. Zone of Illuviation

D. None of the above

231. Nitrosomonas and nitrobacter are together as called_____________?
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A. Nitrification

B. Nitrobacteria

C. Nitosomonas

D. Ammonification

232. The nutrient element silicon (Si) is:_________?
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A. Beneficial

B. Harmful

C. Both a and b

D. None of the above

233. A group of soils with same parent material but located at different positions of slope?
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A. Biosequence

B. Chronosequence

C. Cateena

D. Catena

234. Walkley and Blacks method of organic matter determination allows recovery of _____% organic carbon content:
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A. 54%

B. 62.50%

C. 34%

D. 74 %

235. The appropriate method to apply phosphatic fertilizers is__________?
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A. Top dressing

B. Broad casting

C. both A and B

D. Basal placement

236. The Tree sends down roots from its branches to the soil is known as:___________?
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A. Oak

B. Banyan

C. Palm

D. Pine

237. The resistance of a soil at various moisture contents to mechanical stresses or manipulations:
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A. Soil crusting

B. Soil consistence

C. Bulk Density

D. Both a & c

238. Which of the following fertilizers show maximum residual acidity with the continuous soil application:
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A. Ammonium sulphate

B. Ammonium nitrate

C. Calcium ammonium nitrate

D. Urea

239. The credit for identifying the essentality of nitrogen to plants goes to________?
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A. Shafiq Baloch at.el

B. Theodore-saussure

C. Dr.Muhammad Sharif

D. Sach and knoop

240. Previously Essential nutrients required for the growth of plants were sixteen. In recent time the essential nutrients required for the growth of plants are:_________?
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A. 18

B. 17

C. None of the above

D. 16

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