In which compound does iron have a valency of three?
Correct answer B. Fe(NO3)3
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Agriculture MCQs
Page 26 of Agriculture multiple-choice questions with answers. Tap an option to check yourself.
Page 26 of 135
What is a virus that infects bacteria called?
Correct answer A. Bacteriophage
Which crop absorbs nitrogen mainly in the ammonium form?
Correct answer C. Rice
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What are diatoms classified as in soil biology?
Correct answer B. Soil Algae
What pH range is typical of calcareous soils?
Correct answer B. 8.0-8.5
In which clay mineral is potassium fixation capacity greatest?
Correct answer B. Vermiculite
Which of the following is the chemical formula of urea?
Correct answer B. CO(NH2)2
What is the usual organic matter content of soils in Pakistan?
Correct answer C. Less than 1%
Soils with more than 20% organic matter are classed as organic soils. By what other names are they known?
Correct answer D. Both A and C
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Which of the following are recognised types of weathering?
Correct answer D. Both A and C
Granite and basalt are examples of which kind of rock?
Correct answer D. None of the above
Which type of rock, formed from the products of weathering, covers most (about 75%) of the earth’s land surface?
Correct answer D. Sedimentary rocks
What does the abbreviation AAS stand for?
Correct answer B. Atomic absorption spectrophotometer
Which structure describes individual soil particles, such as sand, that do not form aggregates and are usually seen in parent material or the C horizon?
Correct answer A. Single-grained
Prismatic soil structure is seen in which soil series mapped in Khyber Pakhtunkhwa and northern Punjab?
Correct answer D. All of the above
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Wind erosion affects about 40% of Pakistan’s total area. Which regions does this include?
Correct answer D. All of the above
By one estimate, what share of Pakistan’s total area is affected by wind and water erosion?
Correct answer A. 76%
Which macronutrient is typically deficient in sodic soils?
Correct answer C. Ca
What term describes the downward movement of water through a soil column?
Correct answer D. Percolation
Phosphorus is the second major nutrient needed for plant growth. Leaving aside nitrogen and potassium, how does the amount of phosphorus plants need compare with other nutrients?
Correct answer C. Greater quantities