5. Thorn of a plant: While outside taking my 10 pictures for my collection, I made the mistake that I’m sure many other people have made; I used a rose bush as my example of a plant with thorns. However, while researching, I learned that the sharp objects on the stem of a rose are not thorns; they are prickles, which are completely different, although the two are commonly confused. Some examples of plants with thorns are lemon, pomegranate, and wood apple. The purpose of these thorns is to protect the plant from scavenging animals.