Who was the first Deputy Speaker of Lok Sabha?
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_________ is a natural electrical phenomenon characterized by the appearance of streamers of reddish or greenish light in the sky, especially near the northern or southern magnetic pole.
'Neo-Malthusian Theory' is associated with which of the following?
Which of the following gas contributes the maximum to the phenomena of global warming?
_____ is the source of energy and materials in human beings.
Which of the following can undergo sublimation?
Why does the west coast of India receive more rainfall from southwest monsoon than the east coast?
Psidium guajava is the scientific name of ___________.