Q51.Minerals known to be required in large amounts for plant growth include
(1) Magneslum sulphur, iron, zinc
(2) Phosphorus, potassium, sulphur, calcium
(3) Calcium, magnesium, manganese, copper
(4) Potassium, phosphorus, selenium, boron
Ans.2
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Q52. Deficiency symptoms of nitrogen and potassium are visible first in
(1) Senescent leaves
(2) Young leaves
(3) Roots
(4) Buds
Ans.1
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Q53. The first stable product of fixation of atmospheric nitrogen in leguminous plants is
(1) Ammonia (2) Ferric
(3) Glutamate (4) Ferrous
Ans.1
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Q54. Which one of the following is wrong statement?
(1) Phosphorus is a constituent of cell membranes, certain nucleic acids and all proteins
(2) Nitrosomonas and Nitrobacter chemoautotrophs are
(3) Anabaena and Nostoc are capable of fixing nitrogen in free-living state also
(4) Root nodule forming nitrogen fixers live as aerobes under free-living conditions
Ans.1
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Q55. Which one of the following is correctly matched?
(1) Potassium - Readily mobilization
(2) Bakane of rice seedings - F Skoog
(3) Passive transport of nutrients - ATP
(4) Apoplast - Plasmodesmata
Ans.1
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Q56. For its action, nitrogenase requires
(1) High input of energy
(2) Light
(3) Mn²+
(4) Super oxygen radicals
Ans.1
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Q57. Best defined function of Manganese in green plants is
(1) Nitrogen fixation
(2) Photolysis of water
(3) Water absorption
(4) Calvin cycle
Ans.2
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Q58. Nitrifying bacteria
(1) Reduce nitrates to free nitrogen
(2) Oxidize ammonia to nitrates
(3) Convert free nitrogen to nitrogen compounds
(4) Convert proteins into ammonia
Ans.2
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Q59. The function of leghaemoglobin in the root nodules of legumes is
(1) Expression of nif gene
(2) Inhibition of nitrogenase activity
(3) Oxygen removal
(4) Nodule differentiation
Ans.3
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Q60. Which one of the following elements in plants is not remobilised?
(1) Sulphur
(2) Phosphorus
(3) Calcium
(4) Potassium
Ans.3
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