Organelles in Elodea not in onion skin

Are there organelles in Elodea not in  onion skin? If so, what are they and why would you not expect them in the onion?What structures do the Elodea cells have that the red onion skin cells lack? They have chloroplasts because they need the chlorophyll to produce ATP energy from the sun (for food). Onions are underground and do not have access to the sun, so they lack chloroplasts.