51. Urea is a source of
52. Water blooms are formed by
53. Water logging of soil makes it physiologically dry because
54. What is the area in floriculture (in 1000 hectare) in India
55. Which gas of the atmosphere holds up ultraviolet rays ?
56. Which is not a green house gas?
57. Which is not applicable to vegetatively propagated plants
58. Which one is green manure
59. Which one is the major component of Bordeaux mixture
60. Which one of the following is natural insecticide
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