Q. No.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
nitrogenase that does not fix nitrogen
non operational nitrogenase
an operational nitrogenase
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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To regenerate phospophenolpyruvate, C4 and CAM plants require:
1. Boron
2. Manganese
3. Magnesium
4. Sodium
Micronutrients in plants generally act:
1. as cofactors in enzymatic reactions.
2. to enhance regulatory functions.
3. to prevent chlorosis.
4. in the formation of cell walls.
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