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 105 of 116
- A. 1.4 mg of N
- B. 0.14 mg of N
- C. 14 mg of N
- D. 140 mg of NAccess Government Careers
Explanation: One milliequivalent represents one-thousandth of a gram-equivalent; for nitrogen, one equivalent is 14 g, so 1 meq is 14 mg N.
Correct answer: 14 mg of N- A. Chemoautotroph
- B. Photoautotroph
- C. Saprophyte
- D. None of these
Explanation: Chemoautotrophs obtain carbon from atmospheric carbon dioxide and energy by oxidising inorganic substances such as ammonia, nitrite…
Correct answer: Chemoautotroph- A. Denitrification
- B. Volatilization
- C. Leaching
- D. None of these
Explanation: Volatilization is the escape of nitrogen as ammonia gas, especially when ammonium compounds are applied to alkaline soils or left exposed…
Correct answer: Volatilization- A. Ca
- B. Mg
- C. N
- D. S
Explanation: Nitrogen is lost readily from exposed manure through leaching, volatilisation of ammonia, and denitrification.
Correct answer: N- A. 30-35 c, pH 5.5
- B. >35 c, pH less than 5
- C. All of thses
- D. 25-40 c, pH 8-8.5
Explanation: Nitrifying bacteria are most active in warm, near-neutral to slightly alkaline soil, approximately 25–40°C and pH 8–8.5.
Correct answer: 25-40 c, pH 8-8.5- A. Mixed indicator
- B. Azomethine-H
- C. Diphenyle
- D. Phenolpthalein
Explanation: Azomethine-H forms a measurable coloured complex with boron and is therefore widely used to estimate available soil boron.
Correct answer: Azomethine-H- A. Alfisols
- B. Mollisols
- C. Oxisols
- D. Entisols
Explanation: Oxisols are intensely weathered tropical soils dominated by iron and aluminium oxides, with very little weatherable primary mineral…
Correct answer: Oxisols- A. 0.9869 atm
- B. Wt. Of a 1020 cm water column
- C. 75.01 cm high mercury column
- D. All of these
Explanation: One bar is approximately 0.9869 atmosphere, 1020 cm of water, and 75.01 cm of mercury.
Correct answer: All of these- A. All of these
- B. TSP
- C. SSP
- D. DSP
Explanation: Single superphosphate, triple superphosphate, and double superphosphate are manufactured as water-soluble phosphatic fertilizers.
Correct answer: All of these- A. USA
- B. Japan
- C. The Neterlands
- D. Pakistan
Explanation: Plant and Soil is an international soil science journal published by Springer from the Netherlands.
Correct answer: The Neterlands- A. 44 ℅
- B. 45 ℅
- C. 33℅
- D. None of the above
Explanation: Walkley-Black oxidation normally recovers about 77% of the soil organic carbon, so the stated values of 44%, 45%, and 33% are incorrect.
Correct answer: None of the above- A. Water holding capacity
- B. Water use efficiency
- C. Water harvesting
- D. Water potencial
Explanation: The maximum water retained by soil after excess gravitational water has drained away is called field capacity.
Correct answer: Water holding capacity- A. None of the above
- B. Slate, Shist
- C. Dolomite shale, gneiss
- D. Marl, gypsum
Explanation: Marl, gypsum, and dolomite shale are sedimentary materials, while slate, schist, and gneiss are metamorphic rocks.
Correct answer: None of the above- A. both A & B
- B. Non-clastics
- C. Clastics
- D. None of the above
Explanation: Clastics are sediments made from fragments produced by the weathering and disintegration of pre-existing rocks.
Correct answer: Clastics- A. fine-grained
- B. Dark coloured
- C. None of the above
- D. both A & B
Explanation: Basalt cools rapidly at or near the surface, giving it a fine-grained texture, and its iron- and magnesium-rich minerals make it dark…
Correct answer: both A & B- A. Both a & c
- B. Disentigrate
- C. Decompose
- D. Disintegrate
Explanation: Physical weathering disintegrates rocks into smaller particles, while chemical and biological weathering decompose minerals and organic…
Correct answer: Both a & c- A. Water
- B. All of the above
- C. Glaciers
- D. Wind
Explanation: Weathered material can be transported and deposited by running water, wind, or glaciers, producing transported parent materials.
Correct answer: All of the above- A. Laboratory analysis assessing plant available nutrient status
- B. Collection of plant leaves samples only
- C. Salinity & elemental toxicity of a soil
- D. Both A & C
Explanation: Soil testing is laboratory evaluation of soil properties relevant to crop growth, including plant-available nutrients, salinity and…
Correct answer: Both A & C- A. All of the above
- B. Greenhouse pot experimentation & soil testing
- C. Plant analysis
- D. Nutrient deficiency symptoms & field experimentation
Explanation: Fertilizer recommendations are based on several diagnostic approaches: field symptoms and trials, greenhouse experiments, soil testing and…
Correct answer: All of the above- A. Drought stress
- B. All of the above
- C. Depletion of soil fertility and SOM
- D. Accelerated erosion & salinization
Explanation: Dryland degradation is driven by interacting stresses, including drought, accelerated erosion, salinization, nutrient depletion and loss…
Correct answer: All of the above