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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Best defined function of manganese in green plants is
(a) photolysis of water
(b) Calvin cycle
(c) nitrogen fixation
(d) water absorption

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Which one of the following is wrong statement?

(a) Anabaena and Nostoc are capable of fixing nitrogen in free-living state also

(b) Root nodule forming nirogen fixers live as aerobes under free-living conditions

(c) Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins

(d) Nitrosomonas and Nitrobacter are chemoautotrophs

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A nitrogen fixing microbe associated with Azolla in rice fields is
(a) Spirulina 
(b) Anabaena
(c) Frankia
(d) Tolypothrix

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The function of leghaemoglobin in the root nodules of legumes is 

(1) oxygen removal

(2) nodule differentiation

(3) expression of nif gene

(4) inhibition of nitrogenase activity

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