Final answer:
Eudicot leaves have a network-like appearance due to the net-like arrangement of veins known as reticulate venation and the presence of two layers of mesophyll cells: palisade mesophyll and spongy mesophyll.
Step-by-step explanation:
The eudicot leaf appears to have more of a "network" to its appearance due to the arrangement of veins in a net-like pattern, known as reticulate venation. This venation pattern is characteristic of dicot leaves, including eudicots. In contrast, monocot leaves have parallel venation, with the veins running in straight lines across the length of the leaf without converging at a point.
Another reason for the network-like appearance of eudicot leaves is the presence of two layers of mesophyll cells: the palisade mesophyll and the spongy mesophyll. The palisade mesophyll consists of tightly packed, column-shaped cells, while the spongy mesophyll contains loosely arranged, irregularly shaped cells. The air spaces between the spongy mesophyll cells contribute to the network-like appearance.