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

Identify the odd one out from the following cell components.

Match column-$I$ with column-$II$ and select the correct option.

Column-$I$	Column-$II$
$A$. $RER$	$I$. Intracellular and extracellular digestion
$B$. Cell wall	$II$. Provide structural support to the cell
$C$. Flagella	$III$. Protein synthesis and secretion
$D$. Lysosomes	$IV$. Responsible for cell movement

Which of the following terms is $NOT$ correctly matched with its feature?

Adult human $RBCs$ are enucleate. Which of the following statement$(s)$ is/are most appropriate explanation for this feature?
$(1)$ They do not need to reproduce.
$(2)$ They are somatic cells.
$(3)$ They do not metabolise.
$(4)$ All their internal space is available for oxygen transport.

Which of the following pairs are correctly matched?