Title النهائي.pdf ✅

17) High-nitrogen sources provide the most concentrated protein, which allow the compost bacteria to survive and multiply. (e.g. animal manures, fruit and vegetable trimmings, leaves ) ( √ ) 18) Composting Pile Starts with bottom layer of green materials ( X ) 19) The maximum decomposition occurs when compost temperatures range from 35-45 degrees C. ( X ) 20) Temperature is a good indicator of effective composting ( √ ) 21) It is not important that piles are turned frequently ( X ) 22) Fertilizers are absorbed by plants from soil ( ) 23) Non mineral nutrients are Nitrogen, Phosphorus and Potassium while mineral nutrients are Carbon, Hydrogen, Oxygen ( ) 24) C, H, O are the primary nutrients that are converted into food ( ) 25) Essential elements for the plant are N, P, K ( ) 26) In Ostwald process, Nitrogen must first be converted into nitrites by reacting it with oxygen ( ) 27) Haber process requires low pressure and high temperature ( ) 28) Impact of Eutrophication if Increase in Biodiversity ( ) 29) In contact process, Sulphur dioxide is oxidized to Sulphur trioxide using oxygen and an Iron catalyst ( ) 30) When the number of plants increases in an aquatic system, it can block light from reaching deeper water ( ) 31) One of the most important features of bio-coal is that it contains a few amount of carbon ( X ) 32) Biochar is produced by so-called thermochemical conversion of organic material under limited supply of O2, and at a relatively high temperature ( X ) 33) Biochar has a large inner surface area ( √ ) 34) Biochar decrease soil water holding capacity ( X ) 35) Biochar (BC) has been used for improving soil quality, remediation of organic and inorganic contaminants from soil ( √ ) 36) Fast pyrolysis is the rapid thermal decomposition of carbonaceous organic matter in the present of oxygen ( X ) 37) All biochars have the same characteristics ( X ) 38) Engineered biochar and designer biochar are also commonly used terms for biochar modifications ( √ )
39) A soil test is a chemical method for estimating the nutrient supplying power of a soil ( √ ) 40) The element's function can be replaced by another element ( X ) 41) Labeling is very important in soil sampling ( √ ) 42) Changes in biochar properties are expected after its aging in the soil ( √ ) 43) The smaller soil particles (stones, gravel, and coarse sands) are generally rock fragments consisting of several different minerals ( X ) 44) Larger particles tend to be made of a single mineral ( X ) 45) Clay particles are large enough (2.0 to 0.05 mm) to be seen by the naked eye and they allow for more air and water movement ( X ) 46) Sand particles are the smallest mineral particles (0.002 mm) and,they are heavy and hold a lot of water ( X ) 47) Silt particles (0.05 to 0.002 mm) are intermediate between sand and clay – both water holding capacity and fertility. ( √ ) 48) The presence of water in soils is not essential for the survival and growth of plants and other soil organisms ( X ) 49) An important function of the soil is ventilation, allowing O2 to escape and fresh CO2 to enter the root zone. ( X ) 50) The crop can produce satisfactory yields, in sufficient quantity and quality , if there are no satisfactory amounts of the three elements ( X ) 51) The amounts necessary for large yields of good quality vary with different crops and even with different stages of the same crop ( √ ) 52) Maximum area or yield is obtained as the integrity of the equilateral triangle is maintained by increasing the three sides, necessarily equally ( X ) 53) Small differences in length of the fertile triangle are usually not significant, but large differences, particularly if one side dominates the triangle, can seriously affect crop production ( √ ) 54) The health and yield of crops are largely dependent on Air only. ( X ) 55) Nutrients are absorbed by plants from the soil ( √ ) 56) Fertilizers are not needed because there are always enough nutrients in the soil for healthy growth of plants ( X ) 57) Non-mineral nutrients such as N & K ( X ) 58) Mineral nutrients such as O2 & H2 ( X ) 59) Mineral nutrients come from other parts of the environment like the atmosphere ( X )