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