Here's why:
* Centrioles play a vital role in cell division (mitosis and meiosis) by organizing microtubules. These microtubules form the spindle fibers that pull chromosomes apart during cell division.
* Plant cells have a rigid cell wall that prevents the formation of the spindle fibers needed for cell division. Instead, plant cells rely on a structure called the microtubule organizing center (MTOC) which is located in the nucleus. This MTOC helps organize microtubules for cell division.
So, while both plant and animal cells have microtubules, only animal cells have centrioles as the primary organizing centers for microtubules during cell division.