What are the differences between light and dark onions?

To determine the effect of light on the growth of an onion, an experiment is necessary. Take two onions, place them in a container of water, put one in a cabinet, and put the other on a window. After a few days, you can evaluate the result. The bulb that was on the window will sprout and will have strong fleshy green leaves. And the onion that was in the closet, if very weak, the leaves will be thin, long, yellow or white. Accordingly, we can conclude that the presence of light is a necessary condition for normal onion growth.