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. 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. Allophanes and amorphous minerals rarely develop a permanent charge, mainly due to reason that _____ None of these They are secondary minerals They have very small size They lack a crystalline structure 4. Mass of unit volume of dry soil is called_________ Particle density Soil moisture content Bulk density Soil porosity 5. __________ 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 metabisulfite Sodium heptahydrate Sodium hexafluorosilicate 6. Blakish or dark coloured soils are considered most fertile as they often contain ________ Gravel and Sand Silt and microorganisms Sand and calcium Clay and humus 7. Humus typically has a negative charge; however, ________ can cause the development of a positive charge None of these Protonation of humus Decomposition of humus Deprotonation of humus 8. __________ are plants that are adapted to grow in environments with high salt concentrations, such as salt marshes, salt deserts, or saline soils Hydrophytes Glycophytes Halophytes Xeropytes 9. Water moves up from the soil, reaching the highest point of tall trees, through the xylem. This is driven by _____________ Combination of Cohesive and Adhesive forces Cohesive forces Adhesive forces Osmosis 10. Which of the following is NOT a function of healthy soil? Water filtration Carbon sequestration Enhanced biodiversity Higher CO₂ emission to the atmospheric Loading … Question 1 of 10
