The correct answer is 1976.The fundamental duties of citizens were added to the Constitution by the 42nd Constitutional Amendment Act (1976). The 42nd Constitutional Amendment Act (1976) included ten Fundamental Duties.This amendment added a new part, namely, Part IVA to the Constitution.This new part consists of only one Article, that is, Article 51A which for the first time specified a code of ten fundamental duties of the citizens. Later there was an addition of one more Fundamental Duty in 2002 by the 86th Amendment Act.The Fundamental Duties in the Indian Constitution are inspired by the Constitution of the erstwhile USSR.42nd Amendment Act, 1976 is one of the most important amendments to the Indian Constitution. It was enacted by the Indian National Congress headed by Indira Gandhi then. Due to the large number of amendments this act has brought to the Indian Constitution, it is also known as 'Mini-Constitution.