An awesome quiz, but it's almost impossible to tell what level of detail you want. For example, you have some countries filed under "fish" but some under just "tuna", which makes it impossible to know what you want. Just accepting a few more type-ins for things (like "iron" for "iron ore", as an example) would make this a great quiz.
This quiz has promise, but it needs work. Foodstuffs? That is hardly the most common English word one would think of for "food." Also, "vehicles" is accepted for one country, "cars" for some others.