81. Acid rain is a rainfall having pH of
82. Biosphere constitutes
83. Which of the following serves as source of carbon to plants?
84. Least porous soil is
85. The developer of three fold classification of environmental education is
86. Chemical conversion process are often employed for collection of
87. Colourless, odourless and non-corrosive air pollutants are
88. First National Park of India is
89. Principles of Resources Recycling may be
90. Maximum oxygen comes from
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