ETIOPLAST - plastid whose development into a chloroplast has been arrested (stopped)
            by lack of light. They contain a dark crystalline bodies, called prolamellar body,
            which is essentially a cluster of thylakoid membranes in a somewhat tubular form.

LEUCOPLAST types:  non-pigmented plastids...  [figure]
           amyloplasts - colorless plant organelle related to starch production & storage
           aleuroplasts - colorless plant organelle related to protein production & storage
           elaioplats - colorless plant organelle related to oil & lipid production & storage

CHROMOPLASTS - often red, yellow or orange in color;
                     they are found in petals of flowers and in fruit.
                     their color is due to two pigments, carotene and xanthophyll.
        Function -
                     primary function in the cells of flowers is to attract agents of pollination,
                     and in fruit to attract agents of dispersal.
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