Solution:

Dicots exhibit dorsiventral leaves. When examined, the vertical section of a dorsiventral leaf consists of three different parts, they are:

• Epidermis – It can be present on the adaxial epidermis (upper surface) as well as the abaxial epidermis (lower surface) (lower surface). The epidermis is protected on the outside by a thick cuticle. The abaxial epidermis contains more stomata than the upper epidermis.
• Mesophyll – It’s a type of tissue that lies between the abaxial and adaxial epidermis. The palisade parenchyma and the spongy parenchyma are two types of this tissue. The palisade parenchyma is made up of tall, tightly packed cells, whereas the spongy parenchyma is made up of round or oval cells that are loosely packed and have intercellular spaces. The chloroplasts in the mesophyll are responsible for photosynthesis.
• Vascular system – In leaves, the vascular bundles are closed and joined, and they are encircled by dense layers of bundle-sheath cells.