Here's why:

* Centrioles and Centrosomes: These structures are involved in the formation of microtubule organizing centers (MTOCs) and are crucial for the organization and movement of chromosomes during cell division in animal cells.

* Plant Cells: Plant cells, unlike animal cells, use a different mechanism for chromosome movement. They rely on microtubule organizing centers (MTOCs) located at the poles of the dividing cell, but these MTOCs are not formed by centrioles and centrosomes. Instead, they are formed by other structures within the cell.

Therefore, plant cells do not require centrioles or centrosomes for successful cell division.