71. C4 plants differ from C3 plants in
72. Nine-tenth of all photosynthesis of world (85 - 90%) is carried out by
73. Leghaemoglobin per cent in the root nodules of leguminous plants helps in nitrogen fixation by
74. Selective media for Xanthomonas is
75. The law of limiting factors for photoshythesis was enunciated by
76. Which one of the following is a single cell fungi
77. Outer wall of pollen grain is formed of
78. Polar nuclei are located in
79. Club root of crucifers can be controlled by application of
80. First product of photorespiration is
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