What are the structural differences between an elodea and an onion cell?

Question

What are the structural differences between an elodea and an onion cell?

Answer 1

You tell us:

http://www.micrographia.com/specbiol/pla...

http://www.georgedingwall.co.uk/images/E...

Answer 2

In Elodea, the chloroplastides are around the cell wall and they move by cyclosis, and the onion cell (of the bulb, not the stalk) doesn't have chloroplastides, because is underground and not exposed to the light. So, onion has etioplasts, that are plastids without the pigment.