Can Parliament extend the provisions of this Part to the areas mentioned in clause (1)?
Yes, according to clause (3) of the given context: "Notwithstanding anything in this Constitution, Parliament may, by law, extend the provisions of this Part to the Scheduled Areas and the tribal areas referred to in clause (1) subject to such exceptions and modifications as may be specified in such law, and no such law shall be deemed to be an amendment of this Constitution for the purposes of article 368." So, Parliament can extend the provisions of this Part to those areas.