The part of the plant cell where respiration occurs is the:

The mitochondria are known as the powerhouse of the cell because they are the organelles where cellular respiration takes place. In this process, glucose and oxygen are converted into energy, carbon dioxide, and water. The energy produced is stored in the form of ATP (adenosine triphosphate), which is essential for various cellular functions.

Unlike the mitochondria, the nucleus is primarily responsible for storing genetic material and coordinating cell activities, such as growth and reproduction. Chloroplasts are involved in photosynthesis, which captures light energy to produce glucose, while the cell wall provides structural support and protection but does not play a direct role in respiration. Thus, the mitochondria's specific function in energy production makes them the correct answer.