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