soil science MCQs – Page 24

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

soil science Mcqs

461. Main product of photosynthesis is_____________________?
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A. C6H12O6

B. C3H6O6

C. C12H24O12

D. C5H12O6

462. Soil water can be determined by_____________________?
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A. Mass water content

B. Macro pores

C. Both a & b

D. None of the above

463. The conductivity of a saturation extract is greater 4 dsm-1 an exchangeable sodium percentage (ESP) of less than 15 and the pH is usually less than 8.5 is called as__________________?
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A. Saline-sodic soils

B. Neutral soils

C. Saline soils

D. Sodic soils

464. Equation of Ozone is________________________?
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A. O2 O

B. None of the above

C. O3 + O

D. O2 + O =O3

465. A soil with an ESP greater than 15 is usually classified as___________________?
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A. Sodic soil

B. Saline soil

C. None of the above

D. Acidic soil

466. Which bacteria causes fermentation__________________?
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A. Bacillus

B. Corey

C. Azotobacter

D. Pseudomonas

467. Which soil bolds more water ?
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A. Sitry

B. Sandy

C. Clayey

D. Stony

468. Which one of the following is physical property of soil______________________?
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A. Oxidation

B. Reduction

C. None of the above

D. Hydration

469. Age of Earth is_____________________?
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A. 4 billion years

B. 4.5 billion years

C. 6 billion years

D. 1 billion years

470. Acid soils of the worlds arable comprise up to_____________________?
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A. 58%

B. 40%

C. 20%

D. 30%

471. The unit of electrical conductivity is____________________?
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A. mmhos/m

B. dsm-1

C. ms/cm

D. Al the above

472. Felsic rocks consists of___________________?
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A. fe

B. Buiotitic

C. Quartz

D. Quartz & Feldspars

473. Product of microorganism that appears to chelate calcium is called_____________________?
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A. Phospheric acid

B. Carbon dioxide

C. 2-ketoghconic acid

D. Pyruive acid

474. Auxins promote___________________?
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A. Cell elongation

B. Cell division

C. Both a & b

D. None of the above

475. pH in coniferous forest is__________________?
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A. Less than 7

B. Neutral

C. Greater than 7

D. Basis

476. Pneumatic potential is due to____________________?
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A. Petrol

B. Gas

C. Soil

D. Water

477. The net reaction of photosynthesis is_____________________?
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A. None of the above

B. CaCO3 + 2HCl CaCl2 H2O+CO3

C. CO2 + H2O light O2 + (CH3O)

D. ((CH2O) + O2 CO2 + H2O)

478. Acid soil contain pH____________________?
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A. 8.5

B. >7

C. >7.0

D.

479. Cyclic salts are mostly of ______________________?
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A. None of the above

B. Cl

C. SO4

D. HCO<sub>3</sub>

480. International atomic weight of potassium is_________________?
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A. 41

B. 40

C. 38

D. 39.0

Showing 461 to 480 of 503 mcqs