soil science MCQs – Page 15

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

soil science Mcqs

281. Combination of soil genesis and classification is collectively called_________?
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A. Pedology

B. Poly pedology

C. Edaphology

D. None of the above

282. Organic Soils are classified as ____________ and are also known as ____________ soils:
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A. Alfisols. fine & coarse textured

B. Ultisols, Fe & Al rich

C. None of the above

D. Histosols, peat & muck

283. Which leaf of rice is sampled for tissue nutrient analysis?
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A. Mature leaf

B. Lower leaf

C. Both A & B

D. None of these

284. Weathering is the natural process of__________?
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A. Disintegration

B. Sedimentation

C. Decomposition

D. both A & C

285. Conservation agriculture improves the water use efficiency of dryland systems. It has components:
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A. Residue return to keep at least 30% of soil covered

B. all of the above

C. Reduced soil disturbance through no-till or minimum till

D. Crop rotations for better utilization of available water & nutrients

286. The instrument used for measuring the photosynthetically active radiations (PAR) is:________?
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A. Pyrheliometer

B. Pyrgeometer

C. Quantom sensor

D. Both A & C

287. Element responsible pollen grain of plant__________?
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A. P

B. N

C. B

D. K

288. According to one estimate, wind and water erosion over ______ % of the Pakistans total area?
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A. None of the above

B. 76%

C. 46%

D. 36%

289. The seventieth element included in the list of essential nutrient element is:__________?
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A. Cobalt

B. Vanadium

C. Nickle

D. Sodium

290. The availability of essential nutrients from soil to the plants is controlled by the ________ properties of soil:
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A. Physical

B. chemical

C. Biological

D. both A & B

291. Organic matter influences:_________?
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A. Cation exchange capacity

B. Aggregate stability

C. All of the above

D. Water holding capacity

292. The configuration of a surface and the relations among its man-made and natural features is called:________?
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A. All of the above

B. topograpy

C. Topography

D. Tofography

293. Potassium (K) fixation capacity is maximum in:____________?
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A. Illite

B. Montmorillonitic

C. Vermiculite

D. Amorphous clay

294. Humus generally refers to the decomposed organic residues which have undergone a series of degradation and synthesis cycles. The humic substances consist of a series of highly acidic, yellow to black coloured, high molecular weight compounds __________________, which can be separated using different extraction procedures:
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A. Hymatomelanic acid & Humin

B. Humic acid & Fulvic acid

C. both A & B

D. None of these

295. Loss of nitrogen in the form of NH3 in alkaline medium is known as_________?
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A. None of these

B. Leaching

C. Denitrification

D. Volatilization

296. In cation exchange, 18 mg of Ammonium ion can be exchanged for__________?
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A. 6 mg of Al

B. 12 mg of mg

C. 46 mg of Na

D. 40 mg of Ca

297. If the chlorophyll content in plant increases, the solar radiation transmitted:
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A. None of these

B. Decreases

C. Increases

D. Constant

298. The unique soil environment under the influence of plants roots is called rhizosphere and this term was given by__________?
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A. Helium. S. Denial

B. A.Q khan

C. Aristotle et al.

D. Hiltner

299. World biodiversity day is celebrated on:_________?
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A. 2-Mar

B. 22-Apr

C. May-22

D. 21-Mar

300. 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

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