Describe the internal structure of a dorsiventral leaf with the help of labelled diagrams.

(N/A) Dorsiventral leaves are typically found in dicotyledonous plants. The vertical section ($T$.$S$.) of a dorsiventral leaf shows three distinct parts:
$[1]$ Epidermis:
It is present on both the upper surface (adaxial epidermis) and the lower surface (abaxial epidermis). The epidermis on the outside is covered with a thick cuticle. The abaxial epidermis generally bears more stomata than the adaxial epidermis.
$[2]$ Mesophyll:
Mesophyll is the tissue present between the adaxial and abaxial epidermises. It is differentiated into two types of parenchyma:
$(a)$ Palisade parenchyma: Composed of tall,vertically elongated,and compactly placed cells.
$(b)$ Spongy parenchyma: Comprising oval or round,loosely arranged cells with large intercellular spaces and air cavities.
Mesophyll contains chloroplasts,which are the sites of photosynthesis.
$[3]$ Vascular system:
The vascular bundles are conjoint,collateral,and closed. They are surrounded by a thick layer of bundle-sheath cells.