Here's why:

* Centrioles are involved in cell division, specifically in the formation of microtubules that make up the spindle fibers. These fibers help separate chromosomes during mitosis and meiosis.

* Plant cells have a different mechanism for separating chromosomes, relying on microtubules organized by the microtubule organizing center (MTOC), which doesn't involve centrioles.

Let me know if you have any other questions about cell organelles!