All Free Agriculture MCQs with Answers
Every Agriculture question in the bank, across all chapters, each with the correct answer and a written explanation. Free and unlimited, with no account needed.
2,315 questions · page 110 of 116
- A. < 4 dsm-1
- B. Equal to 4 dsm-1
- C. 4-8 dsm-1
- D. None of the above
Explanation: A salt-free or nonsaline soil generally has saturated paste electrical conductivity below 4 dS m⁻¹.
Correct answer: < 4 dsm-1- A. NH nitrogen the NO3 nitrogen in soil
- B. NO2 to NO3 nitrogen in soil
- C. NO3 nitrogen to NH4 + in soil
- D. None of the aboveFind Geological Maps
Explanation: Nitrification is the aerobic microbial oxidation of ammonium nitrogen, first to nitrite and then to nitrate.
Correct answer: NH nitrogen the NO3 nitrogen in soil- A. NH4OH
- B. NH4Cl
- C. NaOH
- D. None of the above
Explanation: Humic substances are commonly extracted from soil organic matter with alkaline sodium hydroxide, which dissolves humic and fulvic…
Correct answer: NaOH- A. Gapon
- B. Liekig
- C. Neir
- D. Felbeek
Explanation: Felbeek is credited in soil-organic-matter literature with defining or describing humic acid.
Correct answer: Felbeek- A. Amino acid
- B. Lignin
- C. fats
- D. Cellulose
Explanation: Lignin has a complex aromatic structure and resists microbial breakdown, so it decays more slowly than amino acids, fats, and cellulose.
Correct answer: Lignin- A. Basidiomycetes
- B. Endospore
- C. Ascomycetes
- D. None of the aboveHire Grant Writers
Explanation: Ascomycetes are a very widespread fungal group, and many members live as saprophytes by decomposing dead organic matter.
Correct answer: Ascomycetes- A. Protozoa
- B. Virus
- C. None of the aboveAccess Government Careers
- D. Both a & b
Explanation: In broad soil-microbiology usage, microbiota includes microscopic organisms such as protozoa and viruses along with bacteria and fungi.
Correct answer: Both a & b- A. All the above
- B. Inceptisols
- C. Entisols
- D. Arid soils
Explanation: Arid soils, Inceptisols, and Entisols all occur widely in Pakistan because of its dry climate, young alluvial deposits, and weakly…
Correct answer: All the above- A. Primary hydration
- B. Residence timeFind Geological Maps
- C. Normality
- D. ppm
Explanation: Residence time is the period an ion or water molecule remains within a particular soil or environmental compartment before leaving or…
Correct answer: Residence timeFind Geological Maps- A. 40%
- B. 30%
- C. 58%
- D. 20%
Explanation: About 40% of the world's arable soils are commonly reported as acidic, mainly because of leaching in humid regions.
Correct answer: 40%- A. Neutral soilsAccess Government Careers
- B. Saline-sodic soils
- C. Sodic soils
- D. Saline soils
Explanation: Saline soils have an EC above 4 dS m−1, ESP below 15, and usually pH below 8.5. Sodic soils instead have high ESP and commonly a higher pH.
Correct answer: Saline soils- A. pH
- B. SAR
- C. EC
- D. ESR
Explanation: pH expresses hydrogen-ion activity and therefore indicates how acidic or basic a soil solution is.
Correct answer: pH- A. Table
- B. Both a & b
- C. Fume hoods
- D. None of the aboveSoil
Explanation: A fume hood removes hazardous vapours and protects the user while concentrated acids, bases, or volatile chemicals are handled.
Correct answer: Fume hoods- A. Ammonium sulphate Iron sulphate
- B. Sodium ammonium sulphate
- C. None of the above
- D. Ferrous Ammonium sulphate
Explanation: Ferrous ammonium sulfate, also called Mohr's salt, has the composition (NH4)2SO4·FeSO4·6H2O. The iron is in the ferrous, or Fe²⁺, state.
Correct answer: Ferrous Ammonium sulphate- A. Wilting point
- B. Field capacity
- C. Available water
- D. Hygroscopic water
Explanation: Wilting point is the lower limit of plant-available water, where soil retains water too tightly for roots to absorb it.
Correct answer: Wilting point- A. Macro element
- B. Heavy metal
- C. Secondary element
- D. Free element
Explanation: Chromium is classified as a heavy metal and can become a soil and water pollutant at elevated concentrations.
Correct answer: Heavy metal- A. Sedimentation
- B. Nitrification
- C. Denitrification
- D. Eutrophication
Explanation: Eutrophication results from excess nutrients, especially nitrogen and phosphorus, stimulating algal growth; decomposition then consumes…
Correct answer: Eutrophication- A. Dispersion of soil particles
- B. Cementing of soil particles
- C. Agregation of soil particles
- D. All the aboveGeology
Explanation: Sodium hexametaphosphate is a dispersing agent used to separate individual soil particles during texture analysis.
Correct answer: Dispersion of soil particles- A. Air
- B. Wind
- C. Water
- D. All the above
Explanation: The sandy, dry landscapes of Thal and Cholistan are especially prone to wind erosion, which moves loose soil particles by saltation and…
Correct answer: Wind- A. Hydrometer
- B. Spectrophotometer
- C. Flame photometer
- D. All the above
Explanation: A flame photometer measures sodium and potassium by detecting the characteristic light emitted by their excited atoms.
Correct answer: Flame photometer