41. Particulate pollutants are
42. Which of the following gases has role an important in maintaining atmospheric temperature?
43. Harmful trace metals in fly ash:
44. The term Ecosystem was coined by
45. _________ ecosystems are maintained artificially by man.
46. Cement factory labourers are prone to
47. In India, tropical evergreen forests occur in
48. The state which constituted green bench
49. The one-horned Rhinoceros is now restricted to which state?
50. What is symbiosis?
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