Explanation:

• Statement 1st is correct: Part XI of the Constitution deals with the legislative relations between the Centre and the states in Articles 245 to 255.

• In the Indian federal setup, the Constitution divides the legislative, executive, and financial functions between the Centre and the states. The Constitution established an integrated judicial system to uphold federal and state laws.

• Statement 2 is incorrect: Under Article 250, Parliament to make laws on any State List subjects during a national emergency. However, the Parliament’s laws under this provision will cease to operate on the expiration of six months of the emergency.

• Statement 3rd is correct: According to Article 252 of the Constitution of India, when two or more States give their consent and pass resolutions for the same in their respective Legislatures to enable the Parliament to make a law on any matter listed in the State List.

Hence option 2nd is correct.