Multiple choice In which of the following cell organelles does cell respiration happen? Nucleus Mitochondria Ribosomes Vacuoles Chromoplast Reveal answer Fill a bubble to check yourself B Correct answer Explanation Yes, it is correct. Respiration happens inside a cell in mitochondria. Hence, it is known as cellular respiration. Mitochondria releases food energy. Hence, it is known as 'powerhouse' of the cell.