How many ATP molecules are required to biologically fix one molecule of nitrogen into two molecules of ammonia?
1. 4
2. 8
3. 12
4. 16

Subtopic:  Genetics & Biochemistry of Nitrogen Fixation |
 64%
From NCERT
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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 |
 81%
From NCERT
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Select the mismatch.

(1) Frankia                      Alnus

(2) Rhodospirillium            Mycorrhiza

(3) Anabaena                   Nitrogen fixer

(4) Rhizobium                 Alfa-fa

Subtopic:  Nitrogen Fixation |
 76%
From NCERT
NEET - 2017
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Which is essential for the growth of root tip?
(1) Zn

(2) Fe

(3) Ca

(4) Mn

Subtopic:  Criteria for Essentiality of Elements |
 56%
From NCERT
NEET - 2016
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In which of the following, all three are macronutrients?
(1) Iron, copper, molybdenum

(2) Molybdenum, magnesium, manganese

(3) Nitrogen, magnesium, phosphorus

(4) Boron, zinc, manganese

Subtopic:  Classification of Nutrients |
 85%
From NCERT
NEET - 2016
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During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by

(1) leghaemoglobin

(2) xanthophyll

(3) carotene

(4) cytochrome

Subtopic:  Nitrogen Fixation |
 94%
From NCERT
NEET - 2015
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Auxin can be bioassayed by

1. Avena coleoptile curvature

2. hydroponics

3. potometer

4. lettuce hypocotyl elongation

Subtopic:  Growth Hormones & Auxin |
 88%
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 |
 84%
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
NEET - 2014
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The most abundant intracellular cation is

1. Na+

2. Ca2+

3. H+

4. K+

Subtopic:  Mineral Function | Classification of Nutrients |
 63%
From NCERT
NEET - 2013
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