What was the exact constitutional status of India on 26th January, 1950?

We adopted parliamentary democracy based on the British model, but how does our model
differ from that model?
(1) As regards legislation, the British Parliament is supreme or sovereign but in India, the
power of the Parliament to legislate is limited.
(2) In India, matters related to the constitutionality of the Amendment of an Act of the
Parliament are referred to the Constitution Bench by the Supreme Court.
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