<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>

What is the function of starch granules in plant cells