AP BIOLOGY

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

Detailed explanation-2: -The petiole is a stalk that connects the blade with the leaf base. The blade is the major photosynthetic surface of the plant and appears green and flattened in a plane perpendicular to the stem.

Detailed explanation-3: -In the picture below, the nodes are the points connecting the petioles to the stem. We call the leaves that are connected to the stem through a simple petiole petiolates.

Detailed explanation-4: -The petiole is a stalk that attaches a leaf to the plant stem. In petiolate leaves the leaf stalk may be long (as in the leaves of celery and rhubarb), or short (for example basil). When completely absent, the blade attaches directly to the stem and is said to be sessile.

Detailed explanation-5: -The correct option is D petiole. The stalk of the leaf is called petiole. The stalk bearing flowers is called peduncle. The stalk of a single flower is called a pedicel. Stipules are small lateral outgrowths on either side of the leaf base.