The Indian Constitution is regarded as "Federal in form and Unitary in spirit."

Explanation:
The Indian Constitution is often described as "Federal in form and Unitary in spirit" because it exhibits characteristics of both federalism and unitarism. This means that while it has a federal structure, it also grants significant powers to the central government, giving it a unitary character in certain aspects.

Federalism in the Indian Constitution:
- Division of powers: The Indian Constitution clearly demarcates powers between the central government and the state governments. It provides for a three-tiered system of government with the central, state, and local governments having their respective domains of authority.
- Dual polity: The Constitution establishes separate governments at the center and in the states, each with its own jurisdiction, powers, and responsibilities.
- Distribution of powers: The Seventh Schedule of the Constitution lists the subjects on which the central and state governments have the authority to legislate. It classifies these subjects into three lists: Union List, State List, and Concurrent List.

Unitarism in the Indian Constitution:
- Strong center: The Indian Constitution grants significant powers to the central government. It has the authority to legislate on matters in the Union List, which includes subjects of national importance such as defense, foreign affairs, and currency.
- Single citizenship: Unlike in a pure federal system, where citizens have dual citizenship (national and state), the Indian Constitution provides for single citizenship. All Indian citizens are governed by a common set of laws and enjoy the same fundamental rights, regardless of the state they belong to.
- Emergency provisions: The Constitution empowers the central government to declare a state of emergency in certain situations, which temporarily gives it additional powers to override the authority of the states.

Implications of "Federal in form and Unitary in spirit":
- While the Constitution provides for a federal structure, the central government has the ability to exercise significant control over the state governments.
- The central government can take necessary measures to maintain the unity and integrity of the country, even if it means encroaching upon the powers of the states.
- The Constitution allows for flexibility and adaptability, enabling the central government to respond effectively to national crises and emergencies.

Overall, the Indian Constitution strikes a delicate balance between federalism and unitarism. It recognizes the importance of both centralization and decentralization of power, ensuring the unity and integrity of the nation while granting autonomy to the states.