The 52nd Amendment Act of 1985 is the correct amendment that added anti-defection provisions and the Tenth Schedule to the Constitution. The options provided (41st, 42nd, 43rd, 44th Amendments) are incorrect. The 42nd Amendment (1976) is known as the 'Mini Constitution' and made wide- ranging changes, while the 44th Amendment (1978) repealed many of these changes. Neither dealt with anti-defection. The 41st and 43rd Amendments also did not introduce anti-defection provisions.