Article 10 of the Indian constitution deals with the continuance of the rights of citizenship.
It states that, subject to the provisions of any law which Parliament may make, any person who is or is deemed to be a citizen of India in any of the preceding provisions of this Part shall still be a citizen.
The provisions of the Indian constitution added in Part II, Article 5-11.
Citizenship Act 1955 talks about Indian citizenship after the Constitution began.
The Citizenship Act of 1955 allows for the acquisition and termination of Indian citizenship.