Soil Science - Study Mode
[#201] Thermal conductivity follows the order
Correct Answer
(A) Sand > loam > clay > peat
Explanation
Solution: Thermal conductivity can be defined as the rate at which heat is transferred by conduction through a unit cross-section area of a material when a temperature gradient exits perpendicular to the area. Its value depends on factors like soil type, composition, structure, bulk density, porosity, moisture content, and temperature. Thermal conductivity follows the order for different soil types that is: Sand > loam > clay > peat. It refers that sand has the highest thermal conductivity whereas peat has the lowest.
[#202] Dual Salt process is associated with which fertilizer
Correct Answer
(B) Ammonium Chloride
Explanation
Solution: The dual salt process is associated with Ammonium Chloride. Ammonium chloride is a nitrogenous fertilizer that usually contains 25% N and most of it is produced by the dual-salt process, in which NH 4 Cl and (Na) 2 CO 3 are formed simultaneously. The double salt process is when two or more simple salts in stoichiometric proportions are attracted to each other, resulting in the formation of a molecular salt that exists only in a solid crystal state but dissociates into their constituent compound in water or any other solvents.
[#203] Which silicate class is having 3-D structure
Correct Answer
(B) Tectosilicate
Explanation
Solution: Tectosilicate is the silicate class that has a 3-D structure. These are framework silicates that have a three-dimensional framework of silicate tetrahedral with SiO 2 or a 1 : 2 ratio. Any member of a group of compounds with structures that have silicate tetrahedrons (each of which consists of a central silicon atom surrounded by four oxygen atoms at the corners of the tetrahedron) arranged in a three-dimensional lattice.
[#204] The rate of water absorption is decreased due to deficiency of
Correct Answer
(A) K
Explanation
Solution: The rate of water absorption is decreased due to deficiency of Potassium . Potassium is needed for controlling both water uptake and the process of allowing plants to harness energy from the sun. The deficiency of potassium might have reduced aquaporin activity, consequently suppressing root hydraulic conductance and water supply to the growing stem for diameter expansion and leaf for transpiration, thus it ultimately affects the rate of absorption of water from roots.
[#205] Which of the following nutrients is lost in the greatest amount by allowing exposure of manure pile to rain
Correct Answer
(A) N
Explanation
Solution: Nitrogen is lost in the greatest amount by allowing exposure of manure pile to rain as manure nitrogen is highly vulnerable to volatilization when ammonium is transformed to ammonia. The efficiency of retention of nutrient elements during manure collection and storage is most critical and causes loss of nutrients.