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

1. Leghaemoglobin

2. Xanthophylls

3. Carotene

4. Cytochrome

Subtopic:  Nodule formation |
 93%
From NCERT
NEET - 2015
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The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements are involved in this reaction?

1. Manganese and chlorine

2. Manganese and potassium

3. Magnesium and molybdenum

4. Magnesium and chlorine

Subtopic:  Mineral Function |
 70%
From NCERT
NEET - 2015
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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 |
 82%
From NCERT
NEET - 2015
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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 |
 81%
From NCERT
AIPMT - 2014
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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 |
 82%
AIPMT - 2013
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The most abundant intracellular cation is:
1. Ca2+
2. H+
3. K+
4. Na+

Subtopic:  Mineral Function |
 66%
From NCERT
AIPMT - 2013
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Which of the following elements is a constituent of biotin?
1. Magnesium
2. Calcium
3. Phosphorus
4. Sulphur
Subtopic:  Mineral Function |
From NCERT
NEET - 2013
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Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N2) to the atmosphere?
 
1. Aerobic nitrate oxidation, and nitrite reduction
2. Decomposition of organic nitrogen, and conversion of dinitrogen to ammonium compounds
3. Enteric fermentation in cattle, and nitrogen fixation by Rhizobium in root nodules of legumes
4. Anaerobic ammonium oxidation, and denitrification

 
Subtopic:  Nitrogen Fixation | Nitrogen Metabolism |
 54%
From NCERT
NEET - 2013
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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 |
 89%
From NCERT
AIPMT - 2012
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Which one of the following is a wrong statement?

1. Anabaena and Nostoc are capable of fixing nitrogen in a free-living state also
2. Root nodule-forming nitrogen fixers live as aerobes under free-living conditions
3. Phosphorus is a constituent of cell membranes, certain nucleic acids, and all proteins
4. Nitrosomonas and Nitrobacter are chemoautotrophs

Subtopic:  Mineral Function |
 56%
From NCERT
AIPMT - 2012
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