A group of volunteers were tightly closed their eyes, blocked their nose, and then were allowed to taste one of these fruits. In most cases, a person could not understand WHAT of this he was eating. Incredibly, this experience proves that the nose plays a big role in shaping the taste of food.
Food tastes in the mouth while stimulating taste and olfactory receptors. Actually, it is the olfactory receptors that are leading in determining taste, so when the nasal congestion does not taste food.
It really is! Try it yourself?
Perhaps you can distinguish a potato from an onion or an apple purely in structure (juiciness, meatiness, etc.), but the taste will be almost the same. The taste really strongly depends on the smell. The simplest example for confirmation: when you have a stuffy nose due to illness, then all food is for one taste or you do not want to eat at all. Personally, I am very bad at smelling any smells, even the harshest ones, so food for me is often tasteless, especially fish.