The Morley-Minto Reforms of 1909 are known for introducing separate electorates. Separate electorates means that voters from different religious or social groups would vote separately, rather than together. These reforms were implemented by the British government in an effort to address the demands for political representation and improve the functioning of the legislative councils in India during the time of British colonial rule. This system of separate electorates was implemented to provide representation to different groups, such as Muslims and Hindus, and it aimed to ensure that each community had a voice in the legislative councils.

It is important to note that the Morley-Minto Reforms did not introduce provincial dyarchy, provincial autonomy, or federalism. These concepts were introduced later through other reforms such as the Government of India Act of 1919 and the Government of India Act of 1935.

In summary, the Morley-Minto Reforms of 1909 are known for introducing separate electorates, not provincial dyarchy, provincial autonomy, or federalism.