0% 6 Soil Science Quiz 8 1 / 50 Which bacteria convert nitrite to nitrate___________________? Pseudomonas Nitrobacter None of the above Frankia 2 / 50 Causes of Soil are:__________? Indiscriminate felling of trees Mismanagement of irrigation syste All of these Over grazing 3 / 50 The available form of sulphur for plant is___________________? SO3 SO2 SO-2 S2 4 / 50 Chitin and steroids are_________? Waxes Lipids Carbohydrates Proteins 5 / 50 A soil is classified as sodic soil when__________? None SAR is >13 EC is 8.5 All the above 6 / 50 Integrated Nutrient Management (INM) is a well-accepted approach for the sustainable management of________? None of these Increased crop production Soil Productivity both a and B 7 / 50 hydrosphere refers to__________? Zone of air Zone of atmosphere Zone of earth crust Zone of water 8 / 50 A mineral horizon that is either too thin, too light in colour, too low in organic matter: Umbric epipedon Mollic epipedon Melanic epipedon Ochric epipedon 9 / 50 What kind of nitrogenous (N) fertilizers should not be used for flooded soil: Ammonical-nitrate Both B & C Ammonical Nitrate 10 / 50 Fine-graned rocks formed on earth crust are called________? Intensive igneous rock Sedimentary rock Plutonic Extrusive rock 11 / 50 Who consider the various properties of soil in relation to plant production? Edaphologists agronomist Soil chemist Pedologist 12 / 50 Granite and Basalt are examples of:___________? Sedimentary Rocks Aqueous rocks None of the above Stratified rocks 13 / 50 Rocks formed from compacted clay or mud are called________? Sand stone None of the above Shale Clay stone 14 / 50 During decomposition of organic matter, inititial decomposition is dominated by:__________? Actinomycetes Fungi Bacteria Both B & C 15 / 50 1 mg of H+ will be equal to_________? 12 mg of Mg2+ All of the above 9 mg of Al3+ 20 mg of ca2+ 16 / 50 Age of Earth is_________? 1 billion years 4.5 billion years 4 billion years 6 billion years 17 / 50 Perfect hardness of any mineral is determined by___________________? Mho?s scale pH scale Foot scale None of the above 18 / 50 A treeless artic plain is called as___________________? Glaciers None of the above Tundra Barren land 19 / 50 Planets in our system are________? 12 8 9 10 20 / 50 The tension of the water at the upper plastic limit is equivalent to pF value: 2 2.5 ? 3.5 1 0.5 21 / 50 Vertical movement of water was studied by_________________? Kohler Ziebig Niel Darcy 22 / 50 Peat soils are not present in Pakistan because these are formed in___________? both A & B Cool climate None of the above Acidic conditions 23 / 50 Mineral soil contain organic carbon___________________? >10% >4% <20% 5% 24 / 50 Any tillage and planting system that maintains at least 30% of the soil surface covered by residue after planting for the purpose of reducing soil erosion by water: Both a & b None of these Deep Tillage Conservation Tillage 25 / 50 Which one of the following is physical property of soil__________? None of the above Hydration Reduction Oxidation 26 / 50 Soil order characterized by excess of weathering with dominant iron and aluminium oxide clays, common in tropics is_________? Entisols Oxisols Alfisols Mollisols 27 / 50 Physical condition of soil for plant growth is called___________________? All the above Tillage Tilth Granulation 28 / 50 Which chemical used to prevent evaporation from surface of water in water bodies? None of these both A and B Cetyle alcohol Methyle alcohol 29 / 50 The deficient level of N (%) in plants suggested by various workers is________? 5% 3% 10% 0% 30 / 50 Ligands that occur in Pakistan soils are__________________? SO4-2 OH All the above OH1 HCO2 CO3-2 SO4-2 31 / 50 Loss of nitrogen in the form of NH3 in alkaline medium is known as_________? None of these Denitrification Leaching Volatilization 32 / 50 Losses of soil water not includes_________? Hydroponics loss down-ward drainage Surface run-off from the field Direct evaporation from the soil & transpiration from vegetation 33 / 50 Soil Organic Matter (SOM) which consists of about _______ % organic carbon plays a vital role by providing macro & micro nutrients: 58% 72% 62% Al of the above 34 / 50 Which of the following nutrient elements are regarded as energy exchangers: Both A & B Hydrogen None of these Oxygen 35 / 50 Weathering is the natural process of__________? Sedimentation both A & C Disintegration Decomposition 36 / 50 Which one of the following techniques is used for assessing available P in soil and does not include growing plants: A-Value E-Value a-Value L-Value 37 / 50 Places where volcanoes occur are_________________? Mid-Atlantic ridge Mediterranean sea Pacific ocean All the above 38 / 50 The chemical formula of Dolomite is________________? None of the above CaCO3 CaMg (CO3)2 MgCO3 39 / 50 In low-rainfall areas, huge shifting sand dunes are commonly found, particularly near human habitations. Techniques of afforesting the shifting dunes needed to be implemented. These techniques consist of___________? None of these Both a & b Treatment of shifting sand-dunes by fixing barriers in parallel stripes or in a chess-board design, using the local shrub material starting from the crest of the dunes to protect the seedlings from burial or exposure by the blowing of sand. Protection against biotic interference 40 / 50 The problem of soil crosion Thal and Cholistan is predominantly due to___________________? Wind Air All the above Water 41 / 50 Which element is known as chemical police man of plant? Phosphorus Magnesium Potassium All of the above 42 / 50 Organic matter in Pakistani soils is generally:_________? 5% less than 10 % 3% less than 1 % 43 / 50 Sugar cane is_________? C3 plant C4 plant None of the above C2 plant 44 / 50 Particular matter consists of________? None of the above Solid and gases Solid and liquid CO2 & N 45 / 50 Which of the following fertilizers show maximum residual acidity with the continuous soil application: Ammonium nitrate Calcium ammonium nitrate Urea Ammonium sulphate 46 / 50 _________ erosion is the removal of a thin layer of soil by water acting over the whole surface. This type of erosion damaged very fertile lands located on slopes, some of which have been eroded to a depth of about 15 cm. Rain splash rill erosion Sheet erosion Gully erosion Stream bank erosion 47 / 50 Metamorphic rocks are classified into:___________? Foliated metamorphic rocks Both a & b None of a & b Non-foliated metamorphic rocks 48 / 50 Weathering is___________? Destructive process Constructive process Both a & b None of the above 49 / 50 The term applied to a material which tends to absorb moisture from the atmosphere is called__________________? Capillary Available Hydroscopic Gravitational 50 / 50 How much percentage of soils of Pakistan are deficient in P__________? 60 50-70 30s 80-90 Provide Your Information Your score is The average score is 72% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevSoil Science Quiz 7 Soil Science Quiz 9Next
