41.
Which tree is known as Coral tree?

42.
The components of LPG are _____________

43.
Biogas is composed of

44.
_________ mixed with diesel reduces carbon monoxide emissions up to 50%.

45.
Fungi is/are

46.
In an aquatic ecosystem, the depth to which light penetrates is called

48.
The maximum in daytime surface temperature typically occurs _______ the earth receives its most intense solar radiation.

49.
The resources that can be replaced by natural ecological cycle is called

50.
The portion of the earth and its environment which can support life is known as _________