Q61. A prokaryotic autotrophic nitrogen fixing symbiont is found in
(1) Pisum (2) Alnus
(3) Cycas (4) Cicer
Ans.3
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Q62. Which one of the following helps in absorption of phosphorus from soil by plants?
(1) Anabaena. (2) Glomus
(3) Rhizobium (4) Frankia
Ans.2
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Q63. Which one of the following is essential for photolysis of water?
(1) Copper (2) Boron
(3) Manganese (4) Zinc
Ans.3
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Q64. Which one of the following is not an essential mineral element for plants while the remaining three are?
(1) Cadmium (2) Phosphorus
(3) Iron (4) Manganese
Ans.1
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Q65. Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation Which one of the following statements is not correct during this process of nitrogen fixation?
(1) Leghaemoglobin scavenges oxygen and is pinkish in colour
(2) Nodules act as sites for nitrogen fixation
(3) The enzyme nitrogenase catalyses the conversion of atmospheric N to NO
(4) Nitrogenase is insensitive to oxygen
Ans.4
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Q66. An element playing important role in nitrogen fixation is
(1) Molybdenum (2) Copper
(3) Manganese (4) Zinc
Ans.1
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Q67. The common nitrogen-fixer in paddy fields is
(1) Frankia
(2) Rhizobium
(3) Azospirillum
(4) Oscillatoria
Ans.3
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Q68. Which one of the following is not a micronutrient?
(1) Boron
(2) Molybdenum
(3) Magnesium
(4) Zinc
Ans.3
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Q69. One of the free-living, anaerobic nitrogen-fixer is
(1) Azotobacter
(2) Rhodospirillum
(3) Beijernickia
(4) Rhizobium
Ans.3
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Q70. Manganese is required in
(1) Plant cell wall formation
(2) Photolysis of water during photosynthesis
(3) Chlorophyll synthesis
(4) Nucleic acid synthesis
Ans.2
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Q71. Nitrogen fixation in root nodules of Alnus is brought about by
(1) Azorhizobium
(2) Bradyhizobium
(3) Clostridium
(4) Frankia
Ans.4
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