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