The principle which requires members of the executive to resign when a governmental proposal is defeated in the parliament is known as

The principle which requires members of the executive to resign when a governmental proposal is defeated in the parliament is known as "collective responsibility". This means that all members of the executive, including the prime minister, are collectively responsible for the actions of the government. If a proposal is defeated in parliament, it is seen as a vote of no confidence in the government, and the entire executive must resign. This principle helps to ensure accountability and transparency in government, as it holds the executive accountable to the legislature.