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 first stable product of fixation of atmospheric nitrogen in leguminous plants is:
1. Ammonia
2. Nitrite
3. Glutamate
4. NO2-
Subtopic:  Nodule formation |
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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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Which one of the following is wrong statement?

1. Anabaena and Nostoc are capable of fixing nitrogen in free- living state also

2. Root nodule forming nitrogen fixers live as aerobes under free-living conditions

3. Phosphorus is a constituents of cell membranes, certain nucleic acids and all proteins

4. Nitrosomonas and Nitrobacter are chemoautotrophs

Subtopic:  Mineral Function |
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For its action, nitrogenase requires :
1.  Light
2.  Mn2+
3.  Super oxygen radicals
4.  High input of energy

Subtopic:  Nodule formation |
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Read the following four statements (I-IV)
(I) Both, photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the
membrane
(II) In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth
(III) Stamens in flowers of Gloriosa and Petunia are polyandrous
(IV) Symbiotic nitrogen-fixers occur in free-living state also in soil
How many of the above statements are right

1.  Three 

2. Four 

3. One 

4. Two 

Subtopic:  Nitrogen Fixation | Nodule formation |
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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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