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 Xeropytes Hydrophytes Glycophytes Halophytes 2. Mass of unit volume of dry soil is called_________ Bulk density Soil porosity Soil moisture content Particle density 3. In horizontal infiltration, water movement is primarily driven by_________ Solute potential Gravitational potential Matric potential Pressure potential 4. Blakish or dark coloured soils are considered most fertile as they often contain ________ Silt and microorganisms Clay and humus Sand and calcium Gravel and Sand 5. According to the standard soil texture classification, clay particles have a diameter of ___________ < 0.2 mm < 0.002 mm < 2 mm <0.02 mm 6. Which of the following is NOT a function of healthy soil? Higher CO₂ emission to the atmospheric Enhanced biodiversity Carbon sequestration Water filtration 7. Humus typically has a negative charge; however, ________ can cause the development of a positive charge Protonation of humus Deprotonation of humus None of these Decomposition of humus 8. 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 Adhesive forces Osmosis Cohesive forces 9. Allophanes and amorphous minerals rarely develop a permanent charge, mainly due to reason that _____ They lack a crystalline structure They are secondary minerals None of these They have very small size 10. __________ 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 hexametaphosphate Sodium hexafluorosilicate Loading … Question 1 of 10
