81.
On which date was the Stockholm Conference on Human Environment held?

82.
Point Calimere sanctuary is situated in which state?

84.
The temperature scale where 0o represents freezing and 100o boiling:

85.
In which Indian state is Corbett National park located

86.
Which state proposed a ban on all types of polythene packing for the first time in India?

87.
Salim Ali Centre for Ornithology and Natural history is located at ______

88.
Lead in water can cause

89.
"A good absorber of a given wavelength of radiation is also a good emitter of that wavelength." This is a statement of: