Indian Polity · Polity

With reference to the Ninth Schedule of the Constitution of India, consider the following statements: I. It was intended to protect Central and State laws included in it from judicial review on the ground of violation of Fundamental Rights. II. The entries included in it are not restricted to the subject of land reforms and abolition of the zamindari system alone. III. Article 31B carries a retrospective effect, but its protective blanket has been subjected to judicial review for laws passed after April 24, 1973, following the I.R. Coelho case (2007). IV. The entries incorporated into the Ninth Schedule can only be done through a Constitutional Amendment by the Parliament. Which of the statements given above are correct?