The first Democratic Upsurge was based on ____.

The participation of Indian adult voter in democratic politics both at the centre and the states.

The correct answer is Option (1) - The participation of Indian adult voter in democratic politics both at the centre and the states.

The first democratic upsurge in India, which occurred from the 1950s to the 1970s, was based on the participation of Indian adult voters in democratic politics both at the center and in the states. This period marked a significant increase in political awareness and participation among the masses, including participation in elections at both the national and state levels. It was a time of significant political mobilization and engagement, leading to changes in government policies and the political landscape of the country.