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