AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Parliament cannot change this arrangement on its own because any amendment to the power-sharing arrangement between the Union and States must be ratified by the legislatures of at least half of the total States.
Source: What makes India a federal country?, Chapter 2
The examiner wants the specific constitutional safeguard that prevents unilateral change by Parliament. The key point is that state legislatures must ratify the change (at least half of all states), making it a joint process, not Parliament's alone. Also acceptable: "it must be passed by both Houses of Parliament with at least two-thirds majority AND ratified by at least half the state legislatures." For 1 mark, mentioning the ratification by states is sufficient.