Can you tell an apple from a pear if you cannot smell either one? Your nose contributes far more to flavor than most people realize. Blocking it changes what you taste. You blindfold a volunteer and have them hold their nose. Then you offer slices of similar foods and ask them to identify each one. Try apple versus pear first. Then test with baby food flavors or jelly beans. Those work well because their textures are nearly identical. Touch gives no clues. Repeat each test with the nose unpinched and compare the results. The difference in accuracy shows how much of what you call "taste" actually comes from your sense of smell.