Explanation:

42nd

42nd amendment, 1976: It was called as Mini constitution of India and was brought during national emergency.

1. Preamble: It inserted words Socialist, Secular and Integrity in the preamble.

2. Legislature: Life of Lok Sabha and state assemblies was extended from 5 to 6 years.

3. President: Article 74 was amended as president shall act in accordance with advice by council of ministers.

4. Fundamental Rights: All DPSP were given primacy over the fundamental rights under articles 14, 19 and 31.

5. Some new directives were added in part IV.

6. Part IVA was added having article 51A containing Fundamental Duties of the citizens.