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

Which of the following is not a part of the endomembrane system?

Which of the following statements are incorrect?
$(i)$ Plant cells have centrioles which are absent in almost all animal cells.
$(ii)$ Ribosomes are the site of protein synthesis.
$(iii)$ The middle lamella is a layer mainly of calcium carbonate which holds the different neighbouring cells together.
$(iv)$ In animal cells, steroidal hormones are synthesized by smooth endoplasmic reticulum.
Of the above statements:

Identify the labels $A, B, C, D$ and $E$ in the given diagram. The following components are listed:
$(i)$ $SER$
$(ii)$ Ribosome
$(iii)$ Nucleus
$(iv)$ Nuclear pore
$(v)$ $RER$

Identify the odd one out from the following cell components.

Select the correct option for the following statements:
$(i)$ $A$ chromosome in which the centromere is situated near the middle is called a metacentric / submetacentric chromosome.
$(ii)$ The air vacuole / contractile vacuole helps in osmoregulation.