62.
The movement "Beej Bachao Andolan" was aimed for the conservation of _______

63.
A dim, "watery" sun visible through a gray sheet-like cloud layer is often a good indication of ____ clouds.

64.
The source of energy in an ecosystem is

65.
Which one of the following problems is not created by noise pollution?

66.
In grazer food chain the living plants are directly

67.
During the course of a year, the sun will disappear from view near the North Pole on what date?

68.
_______ trees shed their leaves during winter and hot summer.

69.
Average total rainfall is 100 - 150 cm in __________ , located in Australia, South America and Africa.

70.
Which one is nature's cleaner?