51. The experimental material that has largely been responsible for making rapid advances in research on photosynthesis is
52. Green manures are mostly used as a source of
53. The sexual, thick walled and resting spores of the rust fungi is known as
54. Black rust or stem rust of wheat is caused by
55. Pigments of PS I occurs in
56. Nutrient uptake by crops is fastest during
57. Erwinia is
58. Which of the following nutrient elements is responsible for the die back of citrus?
59. Development of sporophyte from gametophytic tissue without fusion of gametes is
60. Dinocap (methyl heptyl dinitrophenyl crotonate) is sold in market as
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