All types of plastids possess essentially the same structure because they (a) perform the same function (b) store food materials like starch, fat and protein (c) occur in aerial parts (d) can transform from one form to another.
Option D All the plastids have a common origin and one type of plastid can change into another. Plastids are of 2 main types lencoplasts and chromoplasts. The leucoplasts are colourless and occur in the cells not exposed to sunlight. The chromoplasts are coloured occur in the cells exposed to sunlight.
