While most plant cells do contain mitochondria, there are some exceptions:

* Mature sieve tube elements in the phloem: These cells lack most organelles, including mitochondria, to maximize space for nutrient transport.

* Some parasitic plants: Certain parasitic plants rely on their host for energy and may have reduced or absent mitochondria.

It's important to note that these exceptions are relatively rare. The vast majority of plant cells rely on mitochondria for cellular respiration and energy production, just like animal cells.