71. Boron, Zinc and Manganese are usually referred to as
72. _________ are used for converting saline or brackish water into pure distilled water.
73. The primary cause of a radiation inversion is:
74. Charged particles from the sun that travel through space at high speeds are called:
75. All are particulate pollutants except
76. The rate at which temperature decreases with increasing altitude is known as the:
77. A set of organisms that resemble one another in appearance and behaviour is called a _____________
78. Which of the following will decrease in a rising parcel of air?
79. The pyramid of energy in terrestrial ecosystem is
80. The pyramid of numbers in a single tree is
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