Fundamental Duties were not part of the Constitution as originally adopted. Which amendment inserted them?

Explanation

1. 01

   The Constitution as adopted in 1949 listed Fundamental Rights and Directive Principles, but no duties.

2. 02

   The 42nd Amendment of 1976 added Part IVA, consisting of Article 51A, which set out the Fundamental Duties.

3. 03

   The other three amendments did different work: the 44th restored some protections altered in 1976, the 52nd added the anti-defection provisions, and the 61st lowered the voting age to 18.