The Australian Constitution provides the Governor-General with a number of powers, including; the power to dissolve Parliament (Sections 5, 57), the power to refuse assent to bills presented to her (section 58) and the power to dismiss the government Ministers (section 64)., however, the practical use of such powers is restricted by constitutional convention, which mandate the Governor General to act on ministerial advice, except in exceptional circumstances. Because the conventions are not written in The Constitution, the limits of the Governor General's powers are unclear. Convention does, however, allow The Governor General to exercise some powers without ministerial advice in exceptional circumstances. These powers are known as "reserve powers".