Why can you see the cloroplasts in an onion skin cell?
The above answer is correct, the onion is not a photosynthetic part of the plant, in fact, it is more near the root and is underground. However, there are precursors of chloroplasts (call plastids) that are in the onions. Plastids are storage cells found in plants and can store any type of pigment and nutrient including chlorophyll which is the pigment responsible for photosynthesis. Some onions do have color (such as red onions) and onions obviously have some type of nutritional value (such as starch or other kind of carbohydrate) and so the onions plastids, although not storing chlorophyll (which would make those plastids chloroplasts).
