1) Nitrogen, phosphorous, potassium, calcium, magnesium and sulphur, which are used by plants in relatively large quantities, are referred to as: a. Macro nutrients b. Micro nutrients c. Trace nutrients d. Bulk nutrients
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2) Nitrogenous fertilizer's are classified into: a. Two groups b. Three groups c. Four groups d. None of the above
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3) Non-humic substances are less complex and are _____ to microbial attack than those belonging to humic group: a. More resistant b. Less resistant c. More susceptible d. Less susceptible
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4) Non-symbiotic bacteria fixes _______ amount of N2 than symbiotic N2 fixers: a. Less b. More c. Equal d. Not known
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5) Nutrient index is used to prepare the: a. Soil productivity map b. Soil fertility map c. Both of the above d. None of the above
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6) Nutrient absorbed by plants are carried upward through the: a. Xylem b. Phloem c. Both (a) & (b) d. None of these
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7) Occurrence of quartz, in high amounts makes a rock: a. Hard b. Soft c. Alkaline d. Acidic
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8) Olsen method of P determination is more effective in: a. Acidic soil b. Alkaline ail c. Normal soils d. None of these
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9) On the basis of pH measurements, the nearly neutral soils have pH value between: a. 6.0 to 6.5 b. 6.6 to 7.5 c. 7.5 to 8.5 d. 5.0 to 6.0
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10) On the basis of total mass, the relative abundance of the given elements in the earth's crust is such that: a. Si > O2 > Fe = Al b. O2 > AI > Sl > Fe c. O2 > Si > Fe > Al d. O2 > Si > Al > Fe
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11) Organic carbon content in the soil is a measure of: a. Available potassium b. Available phosphorus c. Available nitrogen d. Available magnesium
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12) Organic matter contains about ______ percent organic carbon: a. 32 b. 18 c. 68 d. 58
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13) Organic matter content of 'histosols' and "hydromorphic" soils is: a. 30-40% b. 50-57% c. 60-70% d. 12 - 18%
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14) Organism used as biofertilizer in wheat cultivation: a. Azotobacter b. Rhizobium c. Nostoc d. All of these
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15) Oxidation of sulfure to sulphate is carried out by: a. Bacillus spp b. Aspergillus spp c. Azotobacter spp d. Thiobacillus spp
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16) Oxygen requirement of the plant is met by absorbing: a. Respiration b. Transpiration c. Photosynthesis d. Chlorophyll formation
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17) Peat soils are ______ in nature: a. 5 - 8% b. 10-40% c. 50-55% d. 60-65%
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18) Peat soils have _____ organic matter: a. 5 - 8% b. 10-40% c. 50-55% d. 60-65%
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19) Pedology is the study of: a. Rocks b. Soils c. Nutrient management d. Crop production
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20) Percent nitrogen is equal to: a. Percent organic matter x 5 b. Percent organic matter x 0.05 c. Percent of organic matter x 0.06 d. None of the above
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21) Percent of total N present in soil is in the form of organic N: a. 95.99 b. 40.8 c. 100 d. 20
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22) Percentage of soil solids in soil is: a. 30% b. 40% c. 50% d. 60%
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23) pH value of 7.0 denotes that the soil reaction is: a. Acidic b. Alkaline c. Neutral d. High alkaline
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24) Phosphates enzyme play a major role in ______ of organic phosphates in soil: a. Adsorption b. Mineralization c. Immobilization d. None of these
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25) Phosphorous occurs in soil in: a. Inorganic form only b. Organic form only c. Both (a) & (b) d. None of these
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26) Phosphorus fixation refers to the phenomenon of: a. Absorption of P2O5 by plant b. Leaching of P2O5 from soil by percolating waters c. Conversion of soluble phosphorus into plant unavailable forms d. Anion exchange with colloidal constituents of soil
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27) Phosphorus is esential for: a. Cell division b. Development of meristematic tissues c. Both of these d. None of these
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28) Physical weathering causes: a. Alternation of rocks and minerals b. Disintegration of rocks and minerals c. Decomposition of rocks and minerals d. Synthesis of rocks and minerals
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29) Plants meet their oxygen requirement by: a. Breakdown of water in the plant body b. Absorbing oxygen from air c. Absorbing oxygen from soil d. All the above methods
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30) Poor quality water contains: a. Higher amount of soluble salts b. Lower amount of soluble salts c. Higher amount of calcium d. None of the above
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31) Potassium fixation is higher in: a. 1:1 type clays b. 2:1 type clays c. Oxide of Fe and Al d. None of the above
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32) Potassium is considered vital in: a. Synthesis of protein and amino acids b. Photosynthetic activity of leaves c. Movement of manufactured food from leaves to root d. All of the above
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33) Process of immobilization refers to: a. Conversion of inorganic form to organic form b. Conversion of organic form to inorganic form c. Conversion of N-compound to protein d. None of the above
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34) Q = KA (P1-P1)/n1 denotes the: a. Fick's law of diffusion b. Stoke's law of velocity of particle falling c. Darcy's equation of gas flow d. None of these
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35) Q = Ki is the ______ equation: a. Darcy's equation b. Fick's law c. Both d. None of these
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36) Radioactive tracer technique is used for determining: a. Translocation of minerals in plants b. Cations exchange capacity of soil c. Both these d. None of these
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37) Which one of the following organic matter has the narrowest C/N ratio? a. Mustard b. FYM c. Compost d. Groundnut cake
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38) Refers to the study of the origin of soils in there natural environment, its classification and description: a. Edaphology b. Pedology c. Geology d. None of the above
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39) Refers to the study of the soil properties in relation to crop production: a. Soil taxonomy b. Geology c. Pedology d. Edaphology
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40) Refers to the upper most biochemical weathered portion of the regolith: a. Soil b. Earth c. Rock d. None of the above
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41) Release of nutrients like nitrogen, phosphorus and sulphur from the added organic matter by M.O. at the initial stage of degradation will depend upon: a. Soil pH b. Soil temperature c. Chemical composition of added organic matter d. Method of incorporation
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42) Rhizobia infect the host legumes through: a. Eqidermal cells b. Cortex cells c. Root bairs d. All of the above
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43) Rhizobium after infection converts to a form, which is irregular in shape and is called: a. Spore b. Cyst c. Bacteriod d. None of the above
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44) Rhizohium culture is used to increase biological nitrogen fixation in: a. Pulse crops b. Cereals crops c. Oilseeds d. Cotton
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45) Rhizobium japonicum can fix the nitrogen in the roots of: a. Soyabean b. Cowpea c. Beans d. Lentil
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46) Rhizobium leguminoserum can fix the nitrogen in the roots of: a. Alfalfa, Sweet clover b. Clovers c. Pea, Sweetpea, lentil d. Beans
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47) Rhizobium phaseoli can fix the nitrogen in the roots of: a. Lentil b. Soyabean c. Pea d. Bean
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48) Rhizobium sp fix atmospheric nitrogen: a. As symbiouts on whet b. As symbiouts on cucumber c. As symbiouts on pulses d. In free soil
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49) Rhizobium trifolii can fix the nitrogen in the roots of: a. Sweet clover b. Clover c. Lupines d. Soyabean
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50) Rhizosphere refers to the small area: a. Around the root b. On the root c. Near the primary root d. All of the above
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