The Ninth Schedule was introduced in the Constitution of India during the prime ministership of

1. The Ninth Schedule was added to the Constitution of India through the First Amendment Act, 1951. 2. The purpose of this schedule was to protect certain laws, particularly those related to land reforms, from being challenged in courts on the grounds that they violated fundamental rights. 3. The First Amendment Act was enacted in 1951. 4. Jawaharlal Nehru was the Prime Minister of India during that period (1947-1964). 5. Therefore, the Ninth Schedule was introduced during the prime ministership of Jawaharlal Nehru. 6. Lal Bahadur Shastri (1964-1966), Indira Gandhi (1966-1977, 1980-1984), and Morarji Desai (1977-1979) served as Prime Ministers much later.