21. World's most problematic aquatic weed is
22. _________ energy is the main driving force of the ecological system.
23. Torrey Canyon is famous for
24. Most of the natural gas used in the United States is consumed by
25. Eravikulam National Park conserves
26. Flag ship species of Choolannur sanctuary
27. Chemical reactions triggered by ________ transforms the organic material into hydrocarbons.
28. Sunlight that bounces off a surface is said to be ________ from the surface.
29. If we uncover half of the forest, covering of the earth, what crisis will be produced at most and at first?
30. An example of one way ecological cycle is
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