When was the Panchayats (Extension to the Scheduled Areas) Act passed by Indian Parliament?

In which of the following group of the States, PESA [Panchayats (Extension to Scheduled Areas) Act], 1996 is not enforceable?

In which Article, the provision on reservation of Scheduled Caste and Scheduled Tribes to Panchayat has been given?

All elections to the Panchayats are conducted by -

Reservation of seats in Panchayat elections for Scheduled Castes shall not apply to the State of –

Which Article of the Indian Constitution directs state Government to organize village Panchayats?