Q. No.An element playing important role in nitrogen fixation is
1. molybdenum
2. copper
3. manganese
4. zinc
1. molybdenum
2. copper
3. manganese
4. zinc
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The free-living, anaerobic nitrogen-fixer is
1. Beijerinckia
2. Rhodospirillum
3. Rhizobium
4. Azotobacter
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A plant requires magnesium for
| 1. holding cells together | 2. protein synthesis |
| 3. chlorophyll synthesis | 4. cell wall development |
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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
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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
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
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 |
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Leguminuous plants are able to fix atmoshpheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statement is not correct during this process of nitrogen fixation ?
1. Nodules act as sites for nitrogen fixation
2. The enzyme nitrogenase catalyses the conversion of atmospheric N2 to NH3
3. Nitrogenase is insensitive to oxygen
4. Leghamoglobin scavenges oxygen and pinkish in color.
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