The parliamentary system of executive vests many powers in the legislature for controlling the executive. Why do you think is it so necessary to control the executive?

In a parliamentary system, the prime minister is the head of government. Most parliamentary systems have a president or monarch who is the nominal head of the government. In India we have the parliamentary system. The Prime Minister is the head of the government. The executive is responsible to the Parliament. The executive holds power until it enjoys the confidence of the Parliament. The Parliament controls the purse-strings of the executive. To ensure that the government would be sensitive to public expectations and responsible and accountable to their needs and aspiration, it is important that body elected by the people i.e. the legislature controls it.