Which cell contains the highest number of chloroplasts?

$A$: Chromoplasts are coloured plastids found in the corolla and ripened fruits.
$R$: They contain water-soluble chlorophyll and carotenoid pigments.

All plastids have essentially the same structure because

Choose the correct sentence.

$S$ - Statement: Aleuroplasts are food storage plastids.
$R$ - Reason: Aleuroplasts lack pigments and store proteins.

Are the different types of plastids interchangeable? If yes,give examples where they are getting converted from one type to another.