During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by

1. Leghaemoglobin

2. Xanthophylls

3. Carotene

4. Cytochrome

Subtopic:  Nodule formation |
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Minerals known to be required in large amounts for plant growth include
1. phosphorus, potassium, sulphur, calcium
2. calcium, magnesium, manganese, copper
3. potassium, phosphorus, selenium, boron
4. magnesium, sulphur, iron, zinc

 

Subtopic:  Classification of Nutrients |
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Deficiency symptoms of nitrogen and potassium are visible first in :

1. Senescent leaves

2. Young leaves

3. Roots

4. Buds

Subtopic:  Mineral Deficiency & Toxicity |
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The most abundant intracellular cation is :
1. Ca2+
2. H+
3. K+
4. Na+

Subtopic:  Mineral Function |
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Best defined function of manganese in green plants is

1. Photolysis of water

2. Calvin cycle

3. Nitrogen fixation

4. Water absorption

Subtopic:  Mineral Function |
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An element playing important role in nitrogen fixation is

1. molybdenum

2. copper

3. manganese

4. zinc

 

Subtopic:  Mineral Function |
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The function of leghemoglobin in the root nodules of legumes is

1. oxygen removal
2. nodule differentiation
3. expression of nif gene
4. inhibition of nitrogenase activity

Subtopic:  Nodule formation |
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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:  Nitrogen Fixation |
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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 |
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The free-living, anaerobic nitrogen-fixer is

1. Beijerinckia

2. Rhodospirillum

3. Rhizobium

4. Azotobacter

Subtopic:  Nitrogen Fixation |
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