The organelle that the described event will occur is mitochondrion
What is the function of mitochondrion?
Energy, CO2, and H20 are produced, indicating that respiration—which occurs in the cytoplasm or mitochondria is occurring. Membrane-bound organelles called mitochondria are present in the cytoplasm of nearly all eukaryotic cells, or cells with distinct nuclei, and their main job is to produce a lot of energy in the form of adenosine triphosphate (ATP).
Membrane-bound cell organelles called mitochondria (mitochondrion, singular) provide the majority of the chemical energy required for the cell's metabolic activities. Adenosine triphosphate, a little molecule, stores the chemical energy generated by the mitochondria. (ATP).