Match the columns and identify the correct option.

Column $I$	Column $II$
$A$. Thylakoids	$(i)$ Disc-shaped sacs in Golgi apparatus
$B$. Cristae	$(ii)$ Condensed structure of $DNA$
$C$. Cisternae	$(iii)$ Flat membranous sacs in stroma
$D$. Chromatin	$(iv)$ Infoldings in mitochondria

Identify the mismatched pair:

$S$ - Statement: Mitochondria are associated with the process of respiration.
$R$ - Reason: Chloroplasts are associated with the process of photosynthesis.

In the given figure,what do the labeled parts 'a' and 'b' represent respectively?

Consider the following statements and choose the correct statement.
$(i)$ The endomembrane system includes mitochondria,chloroplast and peroxisomes.
$(ii)$ Smooth endoplasmic reticulum is the major site for synthesis of lipid.
$(iii)$ Rough endoplasmic reticulum is actively involved in protein synthesis.
$(iv)$ Mitochondrial matrix possesses single circular $DNA$,a few $RNA$ and $80\; S$ ribosomes.
Which of the above statements are correct?

What are $P, Q,$ and $R$ in the given plant cell?