Which of the following is a non–symbiotic nitrogen fixing bacteria?
1.  Rhizobium
2.  Mycorrhiza
3.  Azotobacter
4.  Nitrosomonas

Subtopic:  Nitrogen Fixation |
 63%
From NCERT
AIPMT - 1998
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Anabaena is associated with Azolla's:
1.  Stem
2.  Leaves
3.  Roots
4.  Flowers

Subtopic:  Nitrogen Fixation |
AIPMT - 1999
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Which of the following does not contain metal:
1.  Glycoproteins
2.  Ferritin
3.  Cytochromes
4.  Chromoproteins

Subtopic:  Mineral Function |
 61%
AIPMT - 1999
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Nitrogen-fixing bacteria converts:
1. N2  NH3
2. NH4+  Nitrates
3. NO2  NO3
4. NO3  N2

Subtopic:  Nitrogen Fixation |
 71%
From NCERT
AIPMT - 1999
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Insectivorous plants grow in the soil which is deficient in:
1.  Mg
2.  Ca
3.  P
4.  N

Subtopic:  Mineral Deficiency & Toxicity |
 57%
AIPMT - 1999
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When the plants are grown in magnesium-deficient but urea-rich soil, the symptoms expressed are:

1. Yellowish leaves

2. Colourless petiole

3. Dark green leaves

4. Shoot apex die

Subtopic:  Mineral Deficiency & Toxicity |
 83%
AIPMT - 2000
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Plants take zinc in the form of:

1. ZnSO4 2. Zn2+
3. ZnO 4. Zn
Subtopic:  Mineral Function |
 95%
From NCERT
AIPMT - 2000
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An aquatic fern that is used to increase the yield of paddy crops:

1. Azolla

2. Salvinia

3. Marsilea

4. Isoetes

Subtopic:  Nitrogen Fixation |
 85%
AIPMT - 2000
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What is the best pH of the soil for the cultivation of plants:
1.  3.4 – 5.4
2.  6.5 – 7.5
3.  4.5 – 8.5
4.  5.5 – 6.5

Subtopic:  Hydroponics & Aeroponics |
AIPMT - 2001
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Enzyme first used for nitrogen fixation:
1.  Nitrogenase
2.  Nitroreductase
3.  Transferase
4.  Transaminase

Subtopic:  Nitrogen Fixation |
 93%
From NCERT
AIPMT - 2001
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