Nitrifying bacteria
1. convert free nitrogen to nitrogen compounds
2. convert proteins into ammonia
3. reduce nitrates to free nitrogen
4. oxidize ammonia to nitrates

Subtopic:  Ammonia Assimilation & Nitrogen Export |
 59%
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An organism used as a biofertilizer for raising soyabean crop is
1. Azospirillum
2. Rhizobium
3. Nostoc
4. Azotobacter

Subtopic:  Microbes as Biofertilizer |
 69%
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An element playing important role in nitrogen fixation is
1. molybdenum
2. copper
3. manganese
4. zinc

Subtopic:  Mineral Function |
 79%
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Which one of the following is not a micronutrient?
1. Molybdenum
2. Magnesium
3. Zinc
4. Boron

Subtopic:  Classification of Nutrients |
 86%
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The free-living, anaerobic nitrogen-fixer is
1. Beijerinckia
2. Rhodospirillum
3. Rhizobium
4. Azotobacter

Subtopic:  Nitrogen Fixation |
 71%
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A plant requires magnesium for

1. holding cells together 2. protein synthesis
3. chlorophyll synthesis 4. cell wall development
Subtopic:  Mineral Function |
 87%
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Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum seed yield?
1. Frequent irrigation of the crop
2. Treatment of the plants with cytokinins along with a small dose of nitrogenous fertilizer
3. Removal of all yellow leaves and spraying the remaining green leaves with 2, 4, 5 trichlorophenoxy acetic acid
4. Application of iron and magnesium to promote synthesis of chlorophyll

Subtopic:  Mineral Function |
 71%
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Sulphur is an important nutrient for optimum growth and productivity in:
1. pulse crops
2. cereals
3. fibre crops
4. oilseed crops

Subtopic:  Mineral Function |
 51%
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If by radiation, all nitrogenase enzymes are inactivated, then there will be no
1. Fixation of atmospheric nitrogen
2. Conversion from nitrate to nitrite in legumes
3. Conversion from ammonium to nitrate in soil
4. Fixation of nitrogen in legumes

Subtopic:  Nitrogen Fixation |

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Study the cycle shown below and select the option which gives correct words for all the four blanks A, B, C and D:
            

(A) (B) (C) (D)
1. Denitrification Ammonification Plant 
biomass
Animal
biomass
2. Nitrification Denitrification Animal
biomass
Plant 
biomass
3. Denitrification Nitrification Plant
biomass
Animal
biomass
4. Nitrification Ammonification Animal
biomass
Plant biomass
Subtopic:  Nitrogen Fixation |
 84%
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