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