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

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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.

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Select the mismatch.

(a) Frankia                       Alnus

(b) Rhodospirillium            Mycorrhiza

(c) Anabaena                   Nitrogen fixer

(d) Rhizobium                  Alfa-fa

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Which is essential for the growth of root tip?
(a) Zn
(b) Fe
(c) Ca
(d) Mn

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In which of the following, all three are macronutrients?
(a) Iron, copper, molybdenum
(b) Molybdenum, magnesium, manganese
(c) Nitrogen, magnesium, phosphorus
(d) Boron, zinc, manganese

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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

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Minerals known to be required in large amounts for plant growth include
(a) Phosphorus, potassium, sulphur, calcium
(b) calcium, magnesium, manganese, copper
(c) potassium, phosphorus, selenium, boron
(d) magnessium, sulphur, iron, zinc

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Deficiency symptoms of nitrogen and potassium are visible first in

(a) senescent leaves

(b) young leaves

(c) roots

(d) buds

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The most abundant intracellular cation is

(a) Na+

(b) Ca2+

(c) H+

(d) K+

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The first stable product of fixation of atmospheric nitrogen in leguminous plants is

(a) NO2-

(b) ammonia

(c) NO3-

(d) glutamate

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