$A$ well-organised system of grana and stroma in the plastids of a normal barley plant was reported by

$S -$ Statement: The flattened sac-like structures arranged like a stack of coins are called grana.
$R -$ Reason: There are $40$ to $60$ grana in a chloroplast.

Consider the following five statements $(A$ to $E)$ with respect to the chloroplast shown below. Select the correct option stating which ones are True $(T)$ and which ones are False $(F)$.
$A$. It is impermeable and lacks porins.
$B$. It is selectively permeable,having carrier proteins for transport.
$C$. Stacked thylakoids one over other which is the site of production of assimilatory power.
$D$. Present between two grana and contains enzymes of dark reaction.
$E$. It contains enzymes for the synthesis of sugar and proteins.

$A$

$B$

$C$

$D$

$E$

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

How many grana are typically present in a single chloroplast?

Where are plastids seen? Explain their types and functions in short.