61. An ecosystem must have continuous external source of
62. When number of food chains is interlocked this is called
63. Rain water harvesting is a major method implemented for_____________
64. The pyramid of numbers is inverted in the case of
65. Burning of coal produces oxides of sulphur and nitrogen which combined with water vapor leads to
66. What is deforestation?
67. Lions are found in
68. Favorable morphological and physiological response to a change in environment is called
69. Which among the following is related to the word Mesoderm ?
70. Plantation produces around __________ percentage of industrial woods.
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