71. Late blight of potato turned into an epidemic in which year?
72. Path of dark reaction of photosynthesis was traced through the use of
73. Which one is product in respiration and reagent in photosynthesis
74. A photosynthesising plant is releasing 18O more than the normal. The plant must have been supplied with
75. Infection of smut of maize (Ustilago maydis) occurs during
76. The source of oxygen evolved during photosynthesis is
77. Pollenkitt is formed from
78. Which form of nitrogenlous fertiliser will be preferred for paddy and potato?
79. Brown leaf spot disease of rice is caused by
80. Leaf curl of tomato is spread by
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