1.During cation exchange, 18 mg of ammonium ion can be replaced by how much of which cation?
2.What term describes the greatest quantity of water a soil can retain once gravitational drainage has stopped?
3.Which of the following igneous rocks are widely distributed across large regions in Pakistan?
4.What are the particles called that originate from the breakdown of existing rocks due to weathering?
5.What type of rock is basalt classified as?
6.Which of the following terms is also used to refer to the 'A' horizon in soil profiles?
7.Which processes—physical, chemical, and biological weathering—break down rocks and minerals into simpler substances that either remain in situ or are moved elsewhere to form soil parent material?
8.Which of the following agents transport rocks and weathered debris that serve as the primary materials for soil development?
9.In the context of agriculture, what does soil testing primarily involve?
10.Which methods are commonly employed to assess soil nutrient levels and establish the fertilizer needs of crops?
11.Which nutrients are primarily responsible for soil fertility issues in Pakistan, considering that deficiencies of nitrogen (N), phosphorus (P), and zinc (Zn) are widespread, while potassium (K), iron (Fe), and boron (B) deficiencies occur in certain crops or soils, and sulfur (S), copper (Cu), and manganese (Mn) deficiencies are minimal? Additionally, some micronutrients like molybdenum (Mo) may also be deficient.
12.Recent studies indicate that Pakistan is mainly a dryland country, with 80% of its territory classified as arid and semi-arid, 12% as sub-humid, and only 8% as humid. Soils in arid and semi-arid areas are particularly prone to various degradation processes. Similar to other regions in south-central and southern Asia, as well as Sub-Saharan Africa, which of the following factors are primary contributors to soil degradation and desertification in these climates?
13.How many soil-forming factors influence the type, speed, and strength of pedogenic processes?
14.Which of the following processes describe the changes that occur to parent materials within a soil profile during soil formation?
15.While certain acidic soils are found in the northern mountainous areas of Pakistan (such as Mansehra, Swat, and Dir), the majority of the country’s cultivated soils are ________________, characterized by high base saturation and typically low organic matter content (usually below 1%).
16.Which term is used to collectively describe the O, A, E, and B soil horizons, excluding the R and C layers?
17.In a soil profile, horizons labeled as AB, EB, BA, or BE are classified as which type of horizons?
18.Which soil zone is characterized by the buildup of aluminum and iron oxides along with clay particles that have been transported from the layers above?
19.What term describes a set of soils derived from the same parent material but found at various points along a slope?
20.Why are peat soils absent in Pakistan?