soil science MCQs – Page 16

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

soil science Mcqs
301. C:N ratio of microorganism:
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A. 15:1-20:1

B. N0ne of the above

C. 10:1-15:1

D. 4:1-8:1

302. Transportation & cementation of primary rocks:
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A. All of the above

B. Sedimentary rocks

C. Secondary rocks

D. Aqueous rocks

303. Who consider the various properties of soil in relation to plant production?
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A. Soil chemist

B. Pedologist

C. agronomist

D. Edaphologists
304. The soils most prone to structural crusts are those which are higher in_________?
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A. Clay content

B. Sodium content

C. Silt content

D. Both A & B
305. In Balochistan, deserts also exists in _________, which supoorts wind erosion excluding rocky mountains:
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A. Desert of Kharan

B. Noshki

C. Both A & B

D. Qilla SaifUllah

306. Rhizosphere is:
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A. Area with in the roots

B. Root surface

C. An area of soil in from root surface to 10 cm

D. An area of soil in immediate vicinity around root
307. swelling clay soils, develop cracks due to greater proportion of swelling type clays:
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A. Vertisols

B. Alfisols

C. None of the above

D. Ultisols

308. The immobilization and accumulation of the eluviated constituents at some depth beneath the soil surface:________?
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A. Eluviation

B. Iluviation

C. Melanization

D. Illuviation
309. Soils that have more than 20% organic matter are termed as organic soils. These are also called:________?
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A. Peat soil

B. solonchalk soil

C. Muck soil

D. Both a and c
310. Erosion permitting and erosion resisting crops grow alternatively at right angle to the slope of the land is called as:_________?
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A. Strip planting

B. All of the above

C. Cover planting

D. Linear planting

311. Thick concordant bodies which force the overlying sediments to form dome-shaped hills are called_____________________?
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A. Batholiths

B. Dike

C. Pegmatic

D. Laccoliths
312. Who gave the equation for study of soil property ?
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A. Jenny

B. Newton

C. Ziebig

D. Neil

313. Nitrogen gases are involved in_____________________?
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A. Sleepy feelings

B. Acid rains

C. Hair disease

D. Mental disease

314. The available from of nitrogen for plant is________________?
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A. NO<sub>3</sub>

B. NH<sub>4</sub>

C. Both a & b

D. None of the above

315. Which rock is harder_________________?
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A. Sand stone

B. Sedimentary

C. Metamorphic

D. Igneous

316. Widely spread saprophytic fungi is________________________?
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A. None of the above

B. Endospore

C. Basidiomycetes

D. Ascomycetes
317. The complex fertilizer Nitrophos available in the market contains_____________________?
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A. 23%N & 23% P2O3

B. None of the above

C. 25%N & 23% P2O3

D. 46%N & 23% P2O3

318. Size of clay particle is___________________?
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A. 0.2mm

B. 0.02mm

C. 2mm

D. 0.002mm

319. The molar mass of NaCl is_____________________?
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A. 43.28

B. 50.58

C. 58.58

D. 56.58

320. Deep percolation from a soil profile is generally measured by a device known as_____________________?
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A. Hydrometer

B. Tensiometer

C. Lysimeter

D. Thermometer