Q. No.All the following regarding bacteroid form of Rhizobium are true except:
1. It is a differentiated symbiotic form of nitrogen fixing Rhizobium
2. It is non-motile and non-reproductive
3. It has a more freely permeable membrane than free living Rhizobium
4. It is larger in size than the free living Rhizobium and spherical in shape
1. It is a differentiated symbiotic form of nitrogen fixing Rhizobium
2. It is non-motile and non-reproductive
3. It has a more freely permeable membrane than free living Rhizobium
4. It is larger in size than the free living Rhizobium and spherical in shape
What percentage of the dry weight of a plant is made up of organic molecules?
1. 10%
2. 23%
3. 72%
4. 96%
Rhizobium:
| 1. | lives as aerobe under free-living conditions with an operational nitrogenase that does not fix nitrogen |
| 2. | lives as anaerobe under free-living conditions with a non operational nitrogenase |
| 3. | lives as aerobe during nitrogen-fixing conditions with an operational nitrogenase |
| 4. | lives as anaerobe during nitrogen-fixing conditions with an operational nitrogenase |
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It is vital to bubble air into the solute in hydroponic culture to:
1. evenly distribute the dissolved nutrients
2. provide oxygen to the root cells
3. inhibit the growth of fungi
4. inhibit the growth of anaerobic bacteria
More than 90% of the dry weight of plants is due to:
| 1. carbon and nitrogen | 2. oxygen and hydrogen |
| 3. nitrogen and oxygen | 4. oxygen and carbon |
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In the symbiotic relationship, rhizobia supply ammonia to the plant and in return receive:
1. Simple sugars
2. Fatty acids
3. Organic acids like malate and succinate
4. Amino acids
Plant growth and development mainly depend on:
1. nitrogen; phosphorus; oxygen
2. potassium; carbon; calcium
3. oxygen; carbon; hydrogen
4. phosphorus; nitrogen; potassium
If the leaves of whole plant show chlorosis, the mineral nutrient most likely to be deficient would be:
1. boron
2. manganese
3. nitrogen
4. calcium
Identify the incorrectly matched pair:
|
Mineral |
Function |
|
|
1. |
Nitrogen |
component of nucleic acids, proteins, hormones, coenzymes |
|
2. |
Magnesium |
component of chlorophyll; activates many enzymes |
|
3. |
Phosphorus |
component of nucleic acids, phospholipids, ATP, several coenzymes |
|
4. |
Sulfur |
component of DNA; activates some enzymes |
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The formation and stability of plant cell walls mainly requires:
| 1. | iron | 2. | magnesium |
| 3. | calcium | 4. | molybdenum |
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