121. Checking of reradiating heat by atmospheric dust, O3, CO2 and water vapour is
122. Which of the following is still a very important source of energy for millions of Indians living in villages?
123. Siberian Crane is a regular visitor of which of the following bird sanctuary
124. Biosphere is
125. An intrinsic property of all natural and complete ecosystem, is
126. Forests take part in
127. Which element is locked up in the shells of molluscs?
128. Which of the following is a rich source of energy but never causes atmospheric pollution?
129. The factors that influence the quantity of municipal waste generated include
130. Greenhouse effect is related to
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