What is called venation? Describe its types.

(N/A) $\rightarrow$ Venation: The arrangement of veins and the veinlets in the lamina of a leaf is termed as venation.
$\rightarrow$ Types of Venation:
$1$. Reticulate venation: When the veinlets form a network, the venation is termed as reticulate.
$2$. Parallel venation: When the veins run parallel to each other within a lamina, the venation is termed as parallel.
$\rightarrow$ Leaves of dicotyledonous plants generally possess reticulate venation, while parallel venation is the characteristic of most monocotyledons.