Answer in brief.
How does the Parliament keep a check on the Executive?
In the Parliamentary form of government, Executive is responsible for its policies and acts. It exercises its control in the following ways:
1. It supervises the activities of the executives with the help of committees like committee on government assurance, a committee on petitions, committees on subordinate legislation, etc.
2. The Parliament exercises control over the executive through question hour, zero hours, half an hour discussion, short duration discussion, calling attention motion, adjournment motion, no-confidence motion, censure motion, and other discussions.
3. Parliamentary control is also exercised through its power of ratification. A bill can become law only with the approval of the Parliament.
4. The ministers are collectively responsible to the Parliament in general. Each minister is individually responsible for the efficient administration of the ministry under his charge.
Thus in this way the Parliament can effectively control the executive and ensure a more responsible government.