Among the options given, the organelle that is not found in plant cells is the centriole.
Plant cells have a unique structure that differentiates them from animal cells. They contain vacuoles, which are large fluid-filled sacs that help maintain turgor pressure, mitochondria that generate energy through cellular respiration, and chloroplasts that allow for photosynthesis by capturing light energy.
In contrast, centrioles, which are involved in cell division and the organization of microtubules in animal cells, are generally absent in plant cells. Instead, plant cells often rely on other structures such as the spindle apparatus for cell division.