31. Roses can grow successfully if stock and scion are
32. Seed treatment is done to control
33. Seed treatment with Vitavex is the main controlling method of
34. SO2 and NO2 Produce pollution by increasing
35. SO2 pollution causes
36. Sound becomes hazardous noise pollution at level
37. Spot the odd one
38. Spraying of DDT produces pollution of
39. The desired varieties of economically useful crops are raised by
40. The following is not a plant growth regulator
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