soil science MCQs – Page 2

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

soil science Mcqs

21. __________________ systems play a crucial role in increasing soil organic C storage and reducing net emissions of greenhouse gases in addition to soil erosion control:
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A. All of the above

B. Agroforestry

C. Engineering

D. Cultivating

22. calcium is immobile in plants. Therefore, under conditions of deficiency, young tissue is affected first. calcium deficiency symptoms are:
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A. Death of terminal buds; roots tips also affected

B. Abnormal dark green appearance of foliage

C. All of the above

D. Premature shedding of blossoms & buds & weakened stem

23. In which form plant uptake phosphorus?
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A. Both

B. HPO4-2

C. Non of these

D. H2po4

24. From the sources of plant nutrients availability in soil, which of the following statements are correct:
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A. Air & water is the source of oxygen & the chief source of soil nitrogen is organic matter & when organic matter decomposes it gives ammonia.

B. All of the above

C. The plant absorbs carbon as carbondioxides directly from the atmosphere.

D. Water is the source of hydrogen

25. Effects of soil pollution may also include:___________?
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A. All of the above

B. Soil structure is damaged or polluted soil may no longer grow crops & fodder

C. Crops & fodder grown on polluted soil may pass the pollutants on to the consumers

D. Pollution runs-off into rivers & kills the fish, plant & other aquatic life

26. The soil texture refers to the relative proportion of sand,__________ and clay:
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A. Soil

B. Silt

C. Stone

D. Rock

27. The forest soils have lower bulk density than agricultural soils because of their ______ content.
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A. High organic matter

B. Low organic matter

C. Both a & b

D. None of these

28. Generally speaking, only level to nearly level (0-2 % slope) & gently sloping lands (2-5 % slope) should be:
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A. brought under range crops

B. Forests

C. Both a & b

D. None of the above

29. Conversion of inorganic P to organic P is known as:_________?
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A. Mineralization

B. Immobilization

C. Solubilization

D. both A & C

30. In acidic soil which form of phosphorus uptake by plants?
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A. Both

B. None of these

C. Secondary orthophosphate

D. Primary orthophosphate

31. Deforestation may decrease the chances of__________?
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A. land sliding

B. None of these

C. Wind erosion

D. Rainfall

32. Auxin is_______?
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A. An enzyme

B. A vitamin

C. A protein

D. A hormone

33. The drawbacks of erosion can be divided into:__________?
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A. Onsite damages

B. Offsite damages

C. Both A & B

D. None of the above

34. One of the following is not a form of water erosion:
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A. Sheet erosion

B. Rainsplash erosion

C. Saltation

D. Rill erosion

35. Availability of Phosphorus is maximum at:__________?
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A. Acidic

B. Neutral

C. None of these

D. Alkaline

36. The study of relationship between soil properties & plant production is known as:_________?
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A. Soil Science

B. None of these

C. Agronomy

D. Pedology

37. How many type of soil colloids?
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A. 4

B. 2

C. 5

D. 6

38. Almost one third of the land area through out the world is affected by land degradation. Pakistans agriculture sector though facilitates employment to >65% but is facing challenges from:
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A. Erosion

B. All of the above

C. Waterlogging

D. Salinity

39. Irregular rock masses formed in the pre-existing cracks & crevices are:__________?
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A. Lacoliths

B. Sills

C. Batholiths

D. Dikes

40. A & B horizon is called as:________?
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A. None of the above

B. Poly-pedon

C. Series

D. Regolith

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