The correct answer is Russia. Explanation & Key Takeaways: • The constitution of India has borrowed most of its provisions from the constitution of different countries in the world. • According to Dr. B R Ambedkar, the constitution of India has been framed after ransacking all the known constitutions of the world. • The important provisions borrowed from Russia are: • Five-year plan. • Fundamental duties. Related Concepts: • The important provisions borrowed from Britain are: • Parliamentary form of government • Rule of Law. • Single Citizenship. • Office of Comptroller and Auditor General of India. • Bicameralism. • Writs. • The important provisions borrowed from the United States are: • Fundamental rights. • Preamble. • Independence of judiciary. • Judicial review. • Impeachment. • Post of vice-president. • The important provisions borrowed from Germany: • Suspension of Fundamental Rights during the emergency.