The Ninth Schedule to the Indian Constitution was indeed added by the First Amendment. The purpose of this amendment in 1951 was to protect the social revolution legislation from judicial review. It enabled the government to implement agrarian reform and introduced provisions that prohibited courts from entertaining pleas that challenged laws included in this schedule.

Option 2, the Eighth Amendment, is incorrect as it extends the provisions of reservation of seats for SC/STs and special representation for Anglo-Indians in the Lok Sabha and State Legislative Assemblies for ten years. Option 3, the Ninth Amendment, altered the territories of Indian states and union territories, affecting the international boundaries of India, it`s not associated with the Ninth Schedule. Option 4, the Forty-Second Amendment, is known as the `Mini Constitution,` making substantial changes to the Constitution but not related to the Ninth Schedule.