What is the significance of
$(a)$ presence of cell sap in vacuoles?
$(b)$ presence of $SER$ in liver cells?
$(c)$ presence of ribosomes on $RER$?

(N/A) The cell sap provides turgidity and rigidity to the cell,which helps in maintaining the cell's shape.
$(b)$ The $SER$ (Smooth Endoplasmic Reticulum) in liver cells plays a crucial role in detoxifying many poisons and drugs.
$(c)$ The ribosomes present on the $RER$ (Rough Endoplasmic Reticulum) are the sites of protein synthesis.