1.What term describes the process of the land surface being gradually worn down by natural forces such as wind, water, or ice?
2.What is the term for the cultivation of land plants in a nutrient-rich, oxygenated water solution?
3.What is the correct notation used to represent the electrical conductivity of a saturated soil paste?
4.What is the nature of a solution containing sodium carbonate (Na2CO3)?
5.What term describes the build-up of soluble salts within the root zone of soil?
6.Which atmospheric layer is situated nearest to the Earth's surface?
7.During photosynthesis by algae, the pH of the surrounding water rises and which gas is released?
8.Which of the following is an example of a primary air pollutant?
9.Which scale is used to measure the exact hardness of a mineral?
10.What term describes the combined process of water loss by both plant transpiration and soil surface evaporation?
11.What term describes soil that lacks any form of aggregation or natural clumping?
12.Which instrument is utilized to measure the positive pressure potential in soil water?
13.What is the maximum permissible concentration of NO2 in drinking water?
14.What is the approximate particle density of mineral soil?
15.Which instrument is commonly used to measure deep percolation within a soil profile?
16.What primary effect do auxins have on plant cells?
17.What is the correct chemical formula for the mineral Dolomite?
18.According to certain researchers, what is the threshold toxicity level of zinc (Zn) in plants measured in mg/kg?
19.What is the correct formula to determine the percentage of base saturation?
20.According to WAPDA guidelines, what are the recommended values of EC, SAR, and RSC for third-class irrigation water (C, S, R)?