Noun
proplastid (plural proplastids)
(cytology) A small, colourless cell that develops into any form of plastid
Whether a proplastid develops into a chloroplast some other kind of plastid is mostly controlled by the nucleus and is largely influenced by the kind of cell it resides in. Many plastid interconversions are possible. Source: Internet
Light, however, does not guarantee that a proplastid will develop into a chloroplast. Source: Internet
There is no proplastid differentiation—when an algal cell divides, its chloroplast divides along with it, and each daughter cell receives a mature chloroplast. Source: Internet