A. < 0.002 mm- >2 mm
B. 0.5 mm – 1.0 mm
C. 0.02 mm- 0.2 mm
D. None of the above
Soil Science
Surface removal of ice or snow from a glacier or snowfield by melting, sublimation, and/ or calving:
A. Abrasion
B. Ablation
C. Backplain
D. Bank-Caving
Any tillage and planting system that maintains at least 30% of the soil surface covered by residue after planting for the purpose of reducing soil erosion by water:
A. Deep Tillage
B. Conservation Tillage
C. Both a & b
D. None of these
The following types of check dams have been tried in Pakistan:
A. Brushwood check dams
B. Loose stone or wire-bound check dams
C. Cement & stone check dams
D. All of the above
The unit of a scale used to measure the level of acidity or alkalinity of chemicals is called:
A. Ec
B. pH
C. Pascal
D. None of the above
……….. , considered a perfect soil, is a mixture of silt, clay and sand:
A. Clay
B. Sandy loam
C. Loamy sand
D. Loam
The available soil is being polluted quickly by …………. wastes.
A. Industrial
B. Agricultural
C. Household
D. All of the above
The capacity of a soil to function on sustained basis promoting plant & animal health:
A. Soil neutrality
B. Soil quality
C. Both a & b
D. None of these
Organic matter decomposes rapidly in Pakistani soils because of ………… conditions, that is why our soils generally have < 1% organic matter:
A. High temperature
B. Alkaline
C. Both a & b
D. None of a & b
The soil quality is always deteriorated by:………?
A. Erosion & pollution
B. Waterlogging & salinization
C. Nutrient mining
D. All of these