81. Which book written by Rachel Carson resulted in banning DDT in USA?
82. Any unfavorable alteration of the environment may be called as
83. Energy resources derived from natural organic materials are called
84. Total amount of living material at the various trophic levels of a food chain is depicted by pyramids of
85. Which group of vertebrates comprises the highest number of endangered species?
86. In a population, unrestricted reproductive capacity is called as
87. If there is no atmosphere, the colour of the sky will be
88. _________ is the study that deals with the interaction of organisms with their environment.
89. What is an Incinerator?
90. Air pollution can be of
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