MCQs Soil Science-48 Posted on May 6, 2025August 30, 2025Author agropublishers 0 1. Mass of unit volume of dry soil is called_________ Soil moisture content Particle density Soil porosity Bulk density 2. In horizontal infiltration, water movement is primarily driven by_________ Gravitational potential Matric potential Solute potential Pressure potential 3. Humus typically has a negative charge; however, ________ can cause the development of a positive charge Deprotonation of humus Decomposition of humus Protonation of humus 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. __________ 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 ________ Clay and humus Silt and microorganisms Gravel and Sand Sand and calcium 7. __________ 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 8. 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 9. According to the standard soil texture classification, clay particles have a diameter of ___________ <0.02 mm < 0.002 mm < 0.2 mm < 2 mm 10. Water moves up from the soil, reaching the highest point of tall trees, through the xylem. This is driven by _____________ Adhesive forces Combination of Cohesive and Adhesive forces Cohesive forces Osmosis Loading … Question 1 of 10
