Solution:

• The 31st Amendment of Indian Constitution was all about changing the number of seats of the Parliament. Currently, the total number of seats of Lok Sabha is 545 and of Rajya Sabha is 245. This amendment is brought in the year 1973, and since then the number of a representative of both the houses is the same.

• The Constitution (36th Amendment) Act, 1975 – By this Act, Sikkim became the 22nd State of the Indian Union.

• 26th amendment granted the right to vote to American citizens aged eighteen or older.Passed by Congress March 23, 1971, and ratified July 1, 1971.

• The Constitution (29th Amendment) Act, 1972. The Kerala Land Reforms Act, 1963 (Act 1 of 1964), in the principal land reform law in the State of Kerala and was included in the Ninth schedule to the Constitution.