\begin{itemize}
\item I - Lenticels: Lenticels facilitate gaseous exchange in plants. Therefore, the correct match is I-C (Exchange of gases).
\item II - Cork cambium: Cork cambium generates suberised cells, which form the cork. Thus, the correct match is II-B (Suberised cells).
\item III - Secondary cortex: The secondary cortex is responsible for producing the phelloderm. Hence, the correct match is III-D (Phelloderm).
\item IV - Cork: Cork is produced by the activity of the cork cambium, making the correct match IV-A (Phellogen).
\end{itemize}