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?