Besides darkening photographic film, which instrument can be used to detect radiation?
Correct answer D. GM counter
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Agriculture MCQs
Page 22 of Agriculture multiple-choice questions with answers. Tap an option to check yourself.
Page 22 of 135
Nitrification is the microbial conversion of what in soil?
Correct answer C. NH4 nitrogen to NO3 nitrogen in soil
According to WAPDA, what should the ECe of a salt-free soil remain at?
Correct answer A. < 4 dS m-1
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Which formula is given for calculating base saturation percentage?
Correct answer A. Base saturation percentage = (Ca + Mg + Na) / CEC x 100
At what zinc concentration in plants have some workers suggested toxicity begins?
Correct answer B. > 400 mg kg-1
What is the chemical formula of dolomite?
Correct answer A. CaMg(CO3)2
What do auxins mainly promote?
Correct answer A. Cell elongation
Which device is generally used to measure deep percolation from a soil profile?
Correct answer B. Lysimeter
What is the approximate particle density of a mineral soil?
Correct answer A. 2650 kg m-3
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What is the safe limit of nitrate nitrogen in drinking water?
Correct answer B. 10 mg L-1
Which device measures the positive pressure potential of soil water?
Correct answer C. Piezometer
What is a soil structure with no aggregation called?
Correct answer C. Massive
What is the combined loss of water by transpiration from plants and evaporation from the soil surface called?
Correct answer C. Evapotranspiration
Which scale is used to determine the hardness of a mineral?
Correct answer A. Mohs scale
Which of the following is a primary air pollutant?
Correct answer C. SO2
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Algal photosynthesis raises the pH of water and releases which gas?
Correct answer C. O2
Which atmospheric layer is nearest to the earth’s surface?
Correct answer C. Troposphere
What is the build-up of soluble salts in the root zone called?
Correct answer D. Salinization
What is the nature of sodium carbonate (Na2CO3) salt?
Correct answer C. Alkaline
Which symbol is used for the electrical conductivity of a saturated soil paste?
Correct answer A. ECs