The percentages will definitely decrease as the number of takes increases, especially once it's more than just those of us who trawl the New and Reset Quizzes page
There was no "potato blight" in relation to question 2, there was never a shortage of food except by way of theft by an invading country. It was a genocide perpetrated by the English.
Ireland certainly was struck by potato blight which caused the potato harvest to fail for several years in the 1840s. Whatever other causes contributed to widespread starvation and emigration, it's just weird to claim there was no potato blight.
Yeah, the potato blight was only such a devastating issue because the actions of the British had locked so many of the Irish people into a single-crop dependency and had a wholly inadequate response once it happened, but there very much was a blight.
"Joined Australia" feels inaccurate as all six colonies in Australia federated simultaneously, including Tasmania. Australia didn't exist as a country before Federation so I don't think Tasmania joined per se.
"The proximate cause of the famine was a potato blight"