61. Conservation within the natural habitat is
62. Low level ozone is referred to as __________ ozone.
63. The main atmospheric layer near the surface of earth is
64. Water used for paper mills should not contain
65. Blue revolution is associated with
66. Which of the following can be used as a method of protecting an orchard from damaging low temperatures during a radiation inversion?
67. According to Wein's displacement law, the wavelength at which maximum radiation occurs
68. Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?
69. When a liquid thermometer is held in direct sunlight,
70. The climate of a given region is
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