The correct answer is Bicameralism. Explanation & Key Takeaways: • Bicameralism refers to a legislative system in which there are two houses or chambers. In the context of India, these are the Lok Sabha (Lower House) and the Rajya Sabha (Upper House). • This feature is considered federal in nature as it allows representation of the states in the legislative process through the Rajya Sabha, ensuring that the interests of the states are taken into account. • The Indian Constitution under Article 79 provides for a bicameral legislature at the union level, which is a hallmark of a federal system. • While not all states in India have bicameral legislatures, certain states like Uttar Pradesh, Maharashtra, Bihar, Karnataka, and Andhra Pradesh also have bicameral systems. This reinforces the federal principle of shared legislative powers. • Bicameralism ensures a system of checks and balances, preventing hasty legislation and protecting the interests of diverse groups, especially in a country as vast and varied as India. Related Concepts: • Integrated Judiciary • The concept of an integrated judiciary refers to the judicial system in India, where there is a single system of courts that interprets both union and state laws. It is a feature of a unitary system rather than federalism. • The Supreme Court is at the top of the hierarchy, followed by High Courts at the state level and subordinate courts. • This ensures uniformity in the interpretation of laws across the country. • Single Citizenship • India provides for single citizenship, which means that all Indians are citizens of India, irrespective of the state or territory they belong to. • This promotes the idea of national unity and is considered a unitary feature rather than a federal one.