soil science MCQs – Page 23

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

soil science Mcqs

441. The inner shell of earth consists of_____________________?
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A. Silicate

B. Fe

C. Silicate of Fe & Mg

D. Mg

442. Common soils found in Pakistan are___________________?
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A. Entisols

B. All the above

C. Inceptisols

D. Arid soils

443. Process of mixing soil by fauna and flora is called__________________?
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A. Pedoturbation

B. Lessivage

C. Leaching

D. Enrichment

444. The available form of calcium to plant is________________?
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A. Ca

B. CaO

C. Ca(free cation

D. None of the above

445. A soil is classified as sodic soil when______________________?
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A. EC is 8.5

B. All the above

C. SAR is >13

446. The wearing away of the land surface by wind, water, ice or other geological agents is called____________________?
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A. Soil erosion

B. All the above

C. Soil contamination

D. Seepage

447. Color of fertile soil is_____________________?
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A. Black

B. Green

C. Brown

D. White

448. The nutrient particularly influencing root growth is___________________?
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A. Phosphorus

B. Nitrogen

C. Organic

D. Zinc

449. The soil of Sindh (Pakistan) have pH______________________?
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A. 5.0 to 6.5

B. 7.5 to 8.5

C. 6.5 to 7.5

D. 8.5 to 9.5

450. Gravimetric water is present in__________________?
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A. Mesopores

B. Microspores

C. Macrospores

D. Nanopores

451. Sewage water consists of water and solids in the following percentage___________________?
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A. 90 & 10

B. 80 & 20

C. None of the above

D. 99 & 1

452. How many different minerals deposits are found in Pakistan ?
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A. None of the above

B. 30

C. 60

D. 100

453. Urea in manufactured form gases________________________?
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A. NH3

B. NH48CO2

C. NH3 & CH4

D. All the above

454. An ion or molecule in the coordination sphere central ion is called__________________?
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A. Chelate

B. Potential

C. Ligand

D. Complexion

455. Electrical conductivity of saturated paste is written as____________________?
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A. ECP

B. Ecw

C. ECs

D. ECe

456. Mineral soil contain organic carbon___________________?
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A. >4%

B. 5%

C. >10%

D.

457. Problem of erosion in Thal and Cholistan is due to____________________?
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A. Water

B. Wind

C. Fire

D. Atmosphere

458. The plant in which CO2 fixation is solely via the Calvin cycle is_____________________?
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A. CAB

B. CAM

C. C

D. C

459. Extraction of humic substance can be done by______________________?
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A. NH4OH

B. None of the above

C. NH4Cl

D. NaOH

460. Clear water with organic matter or sediment and minimum biological activity is known as__________________?
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A. Eutrophic

B. Mestrophic

C. Oligotrophic

D. Hydrotrophic

Showing 441 to 460 of 503 mcqs