What changes were made to the text of this section by the Constitution (Seventh Amendment) Act, 1956?
The changes made to the text of this section by the Constitution (Seventh Amendment) Act, 1956 are not explicitly mentioned in the provided context. However, it states that "The Constiutiton (Seventh Amendment) Act, 1956, s. 29 and Sch." led to an insertion of a new clause by the same name and date. This is likely referring to the insertion of clause (2), which deals with Parliament's power to include or exclude socially and educationally backward classes in or from the Central List, subject to certain conditions.