71. Which of the plants is hydrophyte?
72. Soil conservation is achieved through
73. The cycling of elements in an ecosystem is called
74. Greenhouse gases include:
75. Biosphere is made of
76. Soil salinity occurs in India to the extent of
77. The lightest radioactive element is
78. Which is NOT correctly matched?
79. Fluorosis can lead to
80. An area of soil throughly wetted and allowed to drain till percolation stops will have a water content called
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