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