Excessive release of the pollutant carbon monoxide (CO) into the air may produce a condition in which oxygen supply in the human body decreases. What causes this condition?

TAPI gas pipeline is meant to go through :

In which one of the following regions of India would one find vegetation types ranging from tropical to alpine types?

Lichens represent symbiotic relationship between :

In which of the following rocks are coal and petroleum found?

In addition to iron, the intake of which one of the following prevents anaemia?