Here's why:

* Eukaryotes have a true nucleus that encloses their genetic material (DNA). They also have other membrane-bound organelles like mitochondria and chloroplasts.

* Prokaryotes lack a true nucleus and other membrane-bound organelles. Their DNA is located in a region called the nucleoid.

Plants, like animals, fungi, and protists, have a nucleus, mitochondria, chloroplasts, and other complex cellular structures that make them eukaryotes.