MCQs Soil Science-48 Posted on May 6, 2025August 30, 2025Author agropublishers 0 1. __________ are plants that are adapted to grow in environments with high salt concentrations, such as salt marshes, salt deserts, or saline soils Hydrophytes Xeropytes Glycophytes Halophytes 2. According to the standard soil texture classification, clay particles have a diameter of ___________ <0.02 mm < 2 mm < 0.2 mm < 0.002 mm 3. Blakish or dark coloured soils are considered most fertile as they often contain ________ Clay and humus Gravel and Sand Sand and calcium Silt and microorganisms 4. Humus typically has a negative charge; however, ________ can cause the development of a positive charge Decomposition of humus None of these Deprotonation of humus Protonation of humus 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. Mass of unit volume of dry soil is called_________ Soil moisture content Particle density Bulk density Soil porosity 7. Water moves up from the soil, reaching the highest point of tall trees, through the xylem. This is driven by _____________ Adhesive forces Osmosis Combination of Cohesive and Adhesive forces Cohesive forces 8. __________ 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 heptahydrate Sodium hexametaphosphate 9. Allophanes and amorphous minerals rarely develop a permanent charge, mainly due to reason that _____ They lack a crystalline structure They are secondary minerals They have very small size None of these 10. In horizontal infiltration, water movement is primarily driven by_________ Pressure potential Matric potential Gravitational potential Solute potential Loading … Question 1 of 10
