AP BIOLOGY

Detailed explanation-1: -The petiole is the part of the leaf which joins it to a stem or branch. It can also be called leaf stalk. The margin of the leaf is called leaf blade .

Detailed explanation-2: -In botany, the petiole (/ˈpiːti. oʊl/) is the stalk that attaches the leaf blade to the stem, and is able to twist the leaf to face the sun. This gives a characteristic foliage arrangement to the plant.

Detailed explanation-3: -Some leaves are attached to the plant stem by a petiole. Leaves that do not have a petiole and are directly attached to the plant stem are called sessile leaves.

Detailed explanation-4: -The part that joins the leaf of a plant to the main stem.

Detailed explanation-5: -The petiole also called the mesopodium is a cylindrical or sub-cylindrical smooth or grooved stalk of the leaf which lifts the lamina above the level of the stem. So, the correct option is ‘Mesopodium’.