Dear Student ,
Plastid is cell organelle found in plants and algae . Chloroplasts ( type of plastid) has his own DNA.
Major type of Plastid and there functions are
Chloroplast - they perform photosynthesis in cell.
Chromoplast - they play role in synthesis and storage of pigments.
Leucoplast - they play role in synthesis of fatty acid.
Amyloplast - they play role in starch and sugar.
Eiaioplast - they play role in storage of oils and lipids .
Regards.