Answer : 1. "The principle of federation and parliamentary system "
Explanation :

The Government of India Act, 1935 was based on the principle of federation and introduced a parliamentary system of government. It provided for the establishment of a federal structure for India, where powers were divided between the central (federal) government and provincial governments. It also introduced the concept of bicameralism at the federal level and established a parliamentary system, laying the foundation for India's governance until it gained independence in 1947.