71. The Red Data book which lists endangered species is maintained by
72. Human population growth curve is a:
73. _______ species is known as Azadirachta Indica.
74. _______ tree is known as "flame of the forest"?
75. From which language did the word Tsunami originate?
76. The source of aerosol in upper atmosphere is
77. Noise is measured using sound meter and the unit is
78. The concept of ecological pyramid was first proposed by
79. When it is January and winter in the Northern Hemisphere, it is ______and ________in the Southern Hemisphere.
80. The World Wetlands Day is celebrated on ________
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