Explanation:

The Indian Constitution was framed and adopted by the Constituent Assembly of India. As per the Cabinet Mission Plan of 1946, the Constituent Assembly was set up in November 1946. The Constituent Assembly formed 13 important committees for framing the Constitution. The Drafting Committee was headed by Dr B.R. Ambedkar and the first draft Constitution was published in January, 1948. The Constituent Assembly discussed the draft and finally adopted the Constitution on 26th November, 1949. The Constitution came into effect on 26th January, 1950.