<P> Amyloplasts are non-pigmented organelles found in some plant cells . They are responsible for the synthesis and storage of starch granules, through the polymerization of glucose . Amyloplasts also convert this starch back into sugar when the plant needs energy . Large numbers of amyloplasts can be found in fruit and in underground storage tissues of some plants, such as in potato tubers . </P> <P> Amyloplasts are plastids, specifically leucoplasts . Plastids are a specialized class of cellular organelles that carry their own genome and are believed to be descendants of cyanobacteria (blue - green algae) which formed a symbiotic relationship with the eukaryotic cell . </P> <P> Starch synthesis and storage also takes place in chloroplasts, a type of pigmented plastid involved in photosynthesis . Amyloplasts and chloroplasts are closely related, and amyloplasts can turn into chloroplasts; this is for instance observed when potato tubers are exposed to light and turn green . </P>

Amyloplasts chloroplasts chromoplasts and elaioplasts are all examples of