Parliamentary sovereignty is the inalienable attribute of the Parliamentary system of government. It is the most important feature of the parliamentary system.

Parliamentary sovereignty means that the Parliament is the supreme law-making body. It has the power to make, amend and repeal any law. No other institution or authority can challenge the laws made by the Parliament.

The following are the reasons why Parliamentary sovereignty is the inalienable attribute of the Parliamentary system of government:

1. The Parliament is the supreme law-making body: In a parliamentary system of government, the Parliament is the supreme law-making body. It is the only institution that has the power to make, amend and repeal laws. This power is derived from the people, who elect their representatives to the Parliament.

2. The Parliament can make or unmake any law: The Parliament can make or unmake any law. This means that the Parliament has the power to change any law if it deems necessary. This ensures that the laws are always relevant and up-to-date.

3. No other institution can challenge the laws made by the Parliament: Under the parliamentary system of government, no other institution or authority can challenge the laws made by the Parliament. This ensures that the Parliament is the supreme law-making body and its laws are binding on everyone.

4. The Parliament can override the decisions of the judiciary: In a parliamentary system of government, the Parliament can override the decisions of the judiciary. This means that if the Parliament does not agree with a decision made by the judiciary, it can change the law to override that decision.

In conclusion, Parliamentary sovereignty is the inalienable attribute of the Parliamentary system of government. It ensures that the Parliament is the supreme law-making body and its laws are binding on everyone. No other institution or authority can challenge the laws made by the Parliament, which makes it the most important feature of the parliamentary system.

The Indian parliament doesn't enjoy the full sovereignty as the U.K. parliament which can n unmake the laws. The laws made by Indian parliament can be struck down n declared null n void by the Supreme court if they destroy or abrogate the basic features of the the constitution.This is called basic structure theory or doctrine which was propounded by the Supreme court in in the landmark case of Kesavaanda Bharati in 1973