As fruit ripens it emits a chemical called ethylene, which attracts fruit flies. The flies damage the fruit, causing more odor to be released. As this happens, more flies are attracted to the fruit. Of what response is this an example?

• positive feedback

Explanation:

This is best described as positive feedback whereby the output enhances the original stimulus. In this mechanism, the output causes an increase in the original stimulus rather than bringing it to normal levels. This is opposite of negative feedback where the output decreases the original stimulus. In this case the output is the ethylene odor, which attracts flies and as more flies destroy the fruit, more ethylene is produced.