soil science MCQs – Page 3

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

soil science Mcqs

41. Which nutrients are immobile in plants?
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A. Ca only

B. B only

C. P only

D. Both Ca & B

42. The capacity of a soil to function on sustained basis promoting plant and animal health:
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A. Soil Pollution

B. Soil Salinity

C. Soil Quality

D. None of these

43. Which is the correct sequence of soil erosion by water:
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A. Rill-Sheet-Gully

B. Sheet-Rill-Gully

C. Gully-Sheet-Rill

D. None of these

44. Nitrogen & sulphur dioxide liberate from motor vehicles & industries. Nitrogen & Sulphur gases dissolve in the water vapour of atmosphere & form nitric & sulphuric acid. This rain water falls on soil as__________ & contaminates soil also:
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A. Acid rain

B. Neutral rain

C. Both A & B

D. None of the above

45. Azotobacter fixes atmospheric nitrogen in the soil by:__________?
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A. Non-symbiotically

B. None of these

C. Can fix A & B

D. Symbiotically

46. Immobile nutrient in soil is:_________?
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A. P

B. Mg

C. None of the above

D. N

47. Soil order Vertisol is related to:_________?
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A. Black soils

B. River soils

C. Marine deposits

D. Both B & c

48. N and P sprayed on the leaves at time of flowering results in:________?
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A. Increase in fruit yield

B. None of these

C. Improve their protein

D. Increase fruit yeid & protein

49. Vegetation found in saline soils is termed by _________?
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A. Viticphyics

B. Hetrophyics

C. Halophyte

D. Hortiphyics

50. Soil conservation is performed by:_________?
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A. By heavy irrigation

B. Excessive grazing

C. By plantation

D. Cutting trees

51. Soil additive which stabilizes the soil, improves resistance to erosion, increases to permeability to air & water, improves texture, eases cultivation or otherwise improves soil quality:
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A. Soil amendment

B. Soil conditioner

C. Both a & b

D. None of the above

52. In alkaline soil which form of phosphorus uptake by plants?
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A. Secondary orthophosphate

B. None of these

C. Primary orthophosphate

D. both

53. What happens when an saline-alkaline soil is reached with water:
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A. pH decrease, Ec increase

B. pH & Ec both increase

C. pH increase & Ec decrease

D. None of these

54. Ammonium sulfate fertilizer containing 21% N & 24% S, is best in top dressing in:_________?
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A. Rice

B. Barley

C. Date palm

D. None of these

55. Moderately toxic compound:_________?
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A. All of the above

B. Nickle

C. Fluorine

D. Lead

56. Shallow channels that can be readily corrected by routine tillage operations is called:
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A. Permanent gullies

B. Ephemeral gullies

C. Both A & B

D. None of these

57. The clay fraction of the soil contains particles less than 0.002 mm. Particles <0.001 mm size:
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A. Soil Silt

B. Soil colloids

C. Soil loam

D. Soil sand

58. Potassium plays a significant role in the transport of water & nutrients through the plant in the xylem. When the supply of K is reduced, the transportation of ___________________ is depressed:
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A. Calcium, magnesium

B. Nitrates, Phosphates

C. All of the above

D. Amino acids

59. Wash-in takes place in which horizon?
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A. B

B. E

C. O

D. A

60. Rocks and weathered materials transported by ___________ ,act as initial materials for soil formation?
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A. Glaciers

B. Wind

C. Water

D. All of the above

Showing 41 to 60 of 503 mcqs