The question in the text book is this:
In the Constitution, the executive power is vested in the Queen. Does this mean that the Queen makes decisions about what laws should be passed? Explain
For some reason my brain just is not thinking and I cannot seem to come up with a answer for it.
Are there any ideas on how to answer this SIMPLE question?
Thanks ! 
The Consitution prescribes that parliament passes laws, and that the governor-general, acting on behalf of the Queen, gives royal assent (so that the laws come into affect) to the bills that have been passed by the parliament. The governor-general, acting on behalf of the Queen, may withhold royal assent in circumstances which he/she believes are justified.
Because the executive (cabinet) and legislative power (Parliament) are combined to the extent that the cabinet generally consists of members of parliament from the lower house of parliament (house of representatives), they make most decisions about which bills should be introduced in Parliament simply because they have the support of the lower house of parliament (house of reps). Cabinet members are the ministers (and the Prime Minister!)of the government who are drawn from the parliament.
Still, simply having the support of the lower house of parliament doesn't mean that it is inevitble that a bill becomes law as members of the Senate (the upper house of parliament) must also pass this law for it to go to the Governor-General so that it can be given royal assent (or withheld).
MISS LEGAL STUDIES!!!!!