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TAMU SCSC 301 Final Exam Review Exam with Questions and Answers The transformation of a primary mineral to a secondary mineral could occur through which weathering process? ANSWER Acid Dissolution Fine-textured soils require aggregation to become more suitable for plant growth because it _____...

SCSC 301 - EXAM 3 with Questions and Answers Name the eight most abundant elements in soils; be able to order their percentage compositions in rock versus soils, surface versus subsoil, and coarse versus fine particles. ANSWER 1. Oxygen (O) 2. Silicon (Si) 3. Aluminum (Al) 4. Iron (Fe) 5. Cal...

SCSC 301 Final Test with Questions and Answers a typical moist surface soil contains approximately ANSWER 25% air 25% water 45% minerals 5% organic matter a common primary silicate mineral which weathers to form secondary silicate minerals in soils ANSWER agate a primary phosphorous mine...

SCSC 301 Exam 2 with Questions and Answers Soil Atmosphere ANSWER -Varies from atmosphere -Contains 2 main gases needed for the two most important biological processes -High CO2, lower O2 than atmosphere -vital for soils to exchange gases Photosynthesis - consumes CO2 and H2O and releases O...

SCSC 301 Exam with Latest Questions and Answers ____ bacteria are responsible for enzymatic oxidation-reduction reactions in the soil. ANSWER Chemautotrophic The Al:H ratio on exchange sites increases as a soil becomes ____. ANSWER more acidic The ____ is a fundamental coordinated unit foun...

SCSC 301 Exam 2 Review with Questions and Answers autotroph ANSWER -uses inorganic carbon -obtain energy from sun -obtain energy from oxidation of inorganic elements or compounds (Fe, S, H, ammonium, nitrates) heterotroph ANSWER gets carbon and energy from organic compounds aerobe ANSWER ...

SCSC 301- SPRING 2024 Exam with Questions and Answers A soil having a pH of 8.0, 20% exchangeable sodium, and 5 dS conductivity is: ANSWER saline, sodic The most economical means of decreasing the soil pH from 7.0 to 4.5 in a non-calcareous soil is: ANSWER sulfur With the passage of time, t...

SCSC 301 TAMU Test 1 with Questions and Answers Principle Components of Soil ANSWER -Air 25% -Water 25% ^ (healthy soil composition, those two vary from 50-0% to 0-50%) -minerals ~45% -Organics ~5% (again healthy soil it varies) % are by volume not mass Soil ANSWER Dynamic natural body ...

SCSC 301- Exam 4 with Questions and Answers Given values of soil pH, salt concentration, and % exchangeable sodium, distinguish among nonsaline, nonsodic, saline, saline-soidic, and sodic soils, and describe possible means of reclaiming such soils for crop growth. ANSWER Nonsaline - greater than ...

SCSC 301 Exam with Updated Questions and Answers Which horizon is not part of the soil solum? ANSWER C Organic matter in soil typically accounts for ____% or less of the soils total volume. ANSWER 5% Pore space in soil may contain either _____ or _____ ANSWER Air Water Soils are the res...

SCSC 301 Exam with Practice Questions and Answers A soil has a bulk density of 1.3 g/cm3, a particle density of 2.6 g/cm3, a total porosity of .5, and a gravimetric water content of .2. calculate the water-filled porosity. a) .2 b) .24 c) .26 d) .5 e) 1.30 ANSWER c After a growing seas...

SCSC 301 Exam 3 with Latest Questions and Answers Soil Colloid ANSWER organic and inorganic matter with very small particle size and a correspondingly large surface area per unit of mass; observe with electron microscope; adsorb cations and water and have surface charge Surface Charge ANSWER m...

SCSC 301 Tamu Exam 1 with Questions and Answers Chapter1 The Soils Around Us: Why is soil important? ANSWER 5 major functions: 1. medium for plant growth 2. support for buildings and roads (engineering medium) 3. habitat for organisms ication of waters and regulator of water supplies ling s...

SCSC 301 Exam 3 Tamu with Latest Questions and Answers Which of the following is NOT a carbon-containing compound that is involved in the cycling of carbon associated with most plant/animal life forms? ANSWER calcium carbonate Which organic matter property affects the availability of nutrients...