The schedule of the Constitution that lists laws shielded from challenge on the ground that they violate Fundamental Rights, originally added to protect land-reform legislation.
The First Amendment origin, Article 31B, and the Coelho limit (1973 cut-off) are frequently asked, especially alongside the basic structure doctrine.
The Ninth Schedule protects laws from Fundamental Rights challenge, but after Coelho (2007) that protection is not absolute for post-1973 entries; it is unrelated to the Tenth Schedule (anti-defection).
Ninth Schedule (First Amendment, 1951, with Article 31B) shields laws from Fundamental Rights challenge, subject to basic-structure review for post-1973 entries (Coelho, 2007).