This is not correct. In English, plate and dish are interchangeable in this sentence.
tallrik = plate/dish
måltid = meal
maträtt = course (first course, main course, soup course)
maträtt = dish, but almost always used in combination with another word (side dish, main dish, vegetable dish)
Dish can also be a more general term referring to a bowl, plate, cup, platter, etc., and can even include flatware (forks, spoons, knives), especially in the plural form "dishes," but in the absence of details it automatically means "plate."
In this exercise, both "plate" and "dish" should be accepted because they both mean "tallrik."