Introduction:
India adopted a federal system with a strong centre, meaning it has a central government with significant powers, influenced by the federal systems of other countries. Among the options provided, Canada served as the model for India's federal system with a strong central government.

Explanation:
1. Federal System:
A federal system of government is characterized by the division of powers between a central government and multiple regional governments. In India, this division of powers is enshrined in the Constitution, which outlines the powers and responsibilities of the central government and the states.

2. Strong Centre:
In a federal system with a strong centre, the central government possesses significant powers and authority to maintain the unity and integrity of the country. These powers are usually related to defense, foreign affairs, inter-state trade and commerce, and matters of national importance.

3. Adoption of the Federal System:
India's adoption of the federal system with a strong centre was influenced by various factors, including historical, geographical, and political considerations. The framers of the Indian Constitution drew inspiration from the federal systems of other countries, particularly Canada.

4. Canada as a Model:
Canada's federal system served as a model for India due to several similarities between the two countries. These similarities include:

- Size and Diversity: Both Canada and India are large countries with diverse populations, multiple languages, and distinct regional identities. A federal system allows for the accommodation of diverse interests and the protection of regional autonomy.

- Unity with Diversity: Canada's federal system has successfully maintained a balance between a strong central government and the autonomy of its provinces. India sought to replicate this model to manage its own diversities and ensure the unity of the nation.

- Constitutional Provisions: The Indian Constitution borrowed several key provisions from the Canadian federal model. These include a written constitution, a bicameral legislature, a division of powers between the central and state governments, and an independent judiciary.

Conclusion:
In conclusion, India adopted a federal system with a strong centre, and Canada served as the primary model for this system. The similarities between the two countries in terms of size, diversity, and the need for unity with diversity made Canada's federal model particularly relevant for India. The Indian Constitution incorporated several provisions inspired by the Canadian model to establish a strong central government and ensure the effective functioning of the federal system.