Why is the Indian Constitution called as the fundamental law of the land?

The Constitution of India being written constitutes the fundamental law of the land. This has several significant implications. It is under this fundamental law that all laws are made and executed, all governmental authorities act and the validity of their functioning adjudged. No legislature can make a law, and no governmental agency can act, contrary to the Constitution. No act of executive, legislature, judicial or quasi-judicial, of any administrative agency can stand if contrary to the Constitution. The Constitution thus conditions the whole governmental process in the country.