All Free Agriculture MCQs with Answers

• A. Field Capacity (FC)
• B. Hygroscopic coefficient
• C. Maximum water holding capacity
• D. Permanent wilting point

Explanation: The hygroscopic coefficient is the water held by an oven-dry soil when exposed to air at 100% relative humidity.

• A. Sugar, celluloses, hemicelluloses
• B. Proteins, lignins
• C. All of the above
• D. Waxes, lipids

Explanation: Plant and animal residues contain carbohydrates such as sugars, cellulose and hemicellulose, as well as proteins, lignin, waxes and…

• A. Increase in Soil pH
• B. None of the themSearch Public Records
• C. Remains same
• D. Decrease in soil pH

Explanation: Anion retention is mainly associated with positive charges on soil colloids, which increase as soil pH decreases.

• A. 1.6 Mg/m³
• B. 2.6 Mg/m³
• C. 1.3Mg/m³
• D. None of themSoil

Explanation: The average particle or true density of mineral soil is about 2.65 Mg/m³, commonly rounded to 2.6 Mg/m³.

• A. Leaching
• B. Capillary water
• C. Infiltration
• D. All of them

Explanation: Infiltration is the entry of water into the soil surface. Leaching is the downward movement of dissolved materials, while capillary water…

• A. India
• B. France
• C. China
• D. The Netherlands

Explanation: The journal Soil, formerly associated with the title Journal of Plant and Soil, is published by Springer Nature from the Netherlands.

• A. Calcite
• B. Apatite
• C. Dolomite
• D. Gypsum

Explanation: Apatite is a major phosphorus-bearing mineral and an important source of phosphorus in many soils.

• A. Surface tension
• B. Adhesion
• C. Cohesion
• D. All are correct

Explanation: Cohesion is the attractive force between particles or molecules of the same substance, such as water molecules.

• A. 12250 tonnes/day
• B. 65, 772 tonnes/day
• C. 47,920 tonnes/day
• D. All of the above

Explanation: A commonly cited estimate for solid waste generation in Pakistan is about 47,920 tonnes per day.

• A. Erosion
• B. Salinity
• C. Waterlogging
• D. All of the above

Explanation: Erosion removes productive topsoil, while salinity and waterlogging impair root growth and reduce soil productivity.

• A. Hetrophyics
• B. Halophyte
• C. Viticphyics
• D. Hortiphyics

Explanation: A halophyte is a plant adapted to grow in saline or salt-affected soil. The other terms are misspellings or unrelated names.

• A. Azotobacter
• B. Nitrobacter
• C. Nitrosomonas
• D. Rhizobium

Explanation: Nitrosomonas carries out the first step of nitrification by oxidizing ammonia or ammonium to nitrite.

• A. Sandy Soil
• B. Both A & CFind Geological Maps
• C. Gravely soil
• D. Clay soil

Explanation: Clay soil has the highest cation exchange capacity because its fine particles have a large surface area and many negatively charged…

• A. Neutral
• B. Alkaline
• C. Acidic
• D. None of these

Explanation: Phosphorus is most available near neutral soil pH, roughly 6 to 7. In acidic soils it is fixed by iron and aluminium, while in alkaline…

• A. Diffusion
• B. Interception
• C. None of the aboveHire Grant Writers
• D. Mass flow

Explanation: Nitrogen, especially nitrate, reaches plant roots mainly through mass flow with moving soil water, although diffusion also contributes.

• A. All the macropores filled with air & the micropores filled with water
• B. All the macropores filled with water & the micropores filled with air
• C. All the macro & micropores in the soil are filled with water
• D. All of the above wrong

Explanation: At field capacity, excess gravitational water has drained from the macropores, leaving them filled mainly with air while micropores retain…

• A. Rill-Sheet-Gully
• B. Sheet-Rill-Gully
• C. Gully-Sheet-Rill
• D. None of these

Explanation: Water erosion normally progresses from sheet erosion to rill erosion and finally to gully erosion as concentrated runoff removes…

• A. Soil Silt
• B. Soil sandSoil
• C. Soil loam
• D. Soil colloids

Explanation: Particles smaller than 0.001 mm have very high surface area and behave as soil colloids, which strongly influence water-holding capacity…

• A. Black soils
• B. River soils
• C. Marine deposits
• D. Both B & c

Explanation: Vertisols are dark, clay-rich soils that commonly correspond to black soils or black cotton soils.

• A. Prismatic & Columnar
• B. Spheroidal or Sphere-like
• C. Angular blocky Sub-angular blocky
• D. Platy & Luminar

Explanation: Grassland soils usually develop granular or spheroidal aggregates because dense grass roots and organic matter promote crumb formation.