51. Nitrogen fixing bacteria is useful in growing which crop?
52. First organic compound made in laboratory was
B. Uric acid
C. Lactic Acid
53. Gas used for artificial ripening of of fruit is
54. Which of the following element is found in all organic compound?
55. Which of the following is the most abundant element?
56. Which of the following is not a noble gas?
57. Which of the following is responsible for Ozone hole?
58. Which one of the followng is not a essential micronutrient for plants?
59. Which one of the following is responsible for blue baby syndrome?
60. Bio gas is also known as
A. Gobar gas
C. Helium gas
D. Carbon gas