__ are colourless plastids.
Leucoplasts are colourless plastids. They have no pigment. They store starch. Cells of a potato have lots of leucoplasts in them. Chloroplasts are green coloured plastids. They have green coloured pigment called chlorophyll.
Plastids that are colourless (pigment-free) are known as:
Colourless plastids are called as leucoplasts.