That would be a good investigation. As you might expect, the sense of smell has a great effect on taste. You probably experienced this when you had a cold and stopped up nose. Your food had little taste. Much of a food's taste is a combination of its taste and smell. This can be demonstrated and I'm sure you can figure out how to set up such an investigation. See if a blindfolded person whose nose is pinched by a clothespin can tell a piece of onion from a piece of apple (use a sweet onion).