MCQs Soil Science-48 Posted on May 6, 2025August 30, 2025Author agropublishers 0 1. In horizontal infiltration, water movement is primarily driven by_________ Pressure potential Solute potential Matric potential Gravitational potential 2. According to the standard soil texture classification, clay particles have a diameter of ___________ <0.02 mm < 0.2 mm < 2 mm < 0.002 mm 3. Humus typically has a negative charge; however, ________ can cause the development of a positive charge Deprotonation of humus Decomposition of humus None of these Protonation of humus 4. __________ are plants that are adapted to grow in environments with high salt concentrations, such as salt marshes, salt deserts, or saline soils Glycophytes Xeropytes Hydrophytes Halophytes 5. Which of the following is NOT a function of healthy soil? Carbon sequestration Water filtration Enhanced biodiversity Higher CO₂ emission to the atmospheric 6. Water moves up from the soil, reaching the highest point of tall trees, through the xylem. This is driven by _____________ Osmosis Adhesive forces Cohesive forces Combination of Cohesive and Adhesive forces 7. Allophanes and amorphous minerals rarely develop a permanent charge, mainly due to reason that _____ They lack a crystalline structure They are secondary minerals None of these They have very small size 8. __________ is a dispersing agent commonly used in soil textural analysis to break up clay and other particles, allowing for accurate particle size distribution measurements Sodium hexametaphosphate Sodium heptahydrate Sodium hexafluorosilicate Sodium metabisulfite 9. Mass of unit volume of dry soil is called_________ Particle density Soil porosity Bulk density Soil moisture content 10. Blakish or dark coloured soils are considered most fertile as they often contain ________ Silt and microorganisms Clay and humus Gravel and Sand Sand and calcium Loading … Question 1 of 10
