Transverse Section of Monocot Root Chart

Quick Answer: The Transverse Section of Monocot Root Chart is a botany wall chart showing a monocot root, usually maize, cut across to reveal the root-hair layer, broad cortex, endodermis, pericycle, many alternating xylem and phloem strands and a large pith. Teachers use it for plant anatomy lessons and root section practicals.

What a Maize Root Section Shows

In a root, the vascular tissue is packed into a central cylinder called the stele, and the chart’s magnified view makes clear how different this is from a stem. The outer layer is the epiblema, or piliferous layer, a thin-walled epidermis without a cuticle that bears root hairs. Beneath it lies a wide cortex of loosely packed parenchyma, which stores food and passes water inward from the root hairs.

The innermost cortical layer, the endodermis, is drawn as a ring of barrel-shaped cells with thickened walls, interrupted by thin-walled passage cells opposite the xylem. Inside it, a single-layered pericycle surrounds the vascular strands. Xylem and phloem occur as separate bundles on alternate radii, a radial arrangement, and the xylem is exarch, with the narrow protoxylem at the outer edge next to the pericycle.

What marks the section as a monocot is the number of xylem strands, usually many more than six (polyarch), together with the large, well-developed central pith. Monocot roots do not undergo secondary growth, so older roots look much like younger ones in section.

Applications

• Identifying tissues in a stained maize root section during the anatomy practical
• Tracing water from a root hair through the cortex, across the endodermis and into the xylem
• Contrasting radial root bundles with the conjoint bundles of stems during revision
• Answering spotting questions that ask for three features of a monocot root

Care & Handling

• Place the monocot root chart where it can be seen from the section-cutting bench; students refer to it most while their slides are under the microscope.
• Keep glycerine and stain bottles away from the lower edge of the chart, where drips do most damage.
• Store the chart flat in a drawer, or rolled with its dicot counterpart and labelled on the outside so either can be found quickly.

Specifications

Why Choose LabEquip

Root anatomy is almost always examined as a monocot versus dicot comparison, so this chart is most useful hung next to the Dicot Root Structure Chart. Colleges equipping a botany laboratory can source both, along with the rest of the Educational Charts range, from LabEquip and send their list through the contact page.

Frequently Asked Questions

What are passage cells in the endodermis?

Passage cells are endodermis cells that stay thin-walled, usually opposite the xylem strands. Most endodermal cells develop heavily thickened walls in older monocot roots, so the passage cells keep a route open for water and dissolved minerals to cross into the stele.

What does polyarch mean?

It means the root has many xylem strands, typically more than six, arranged in a ring around the pith. Dicot roots usually have two to four, described as diarch, triarch or tetrarch, so counting the xylem strands on a section is a quick way to tell the two apart.

Why does a root have no cuticle?

A root’s job is to absorb water and mineral salts from the soil. A waxy cuticle would block that uptake, so the outer epiblema is thin-walled and bears root hairs that increase the absorbing surface instead.

What is the Casparian strip?

It is a band of suberin and lignin in the radial and transverse walls of endodermis cells. Water cannot pass along the cell walls at that point, so it is forced through the living cytoplasm, which lets the root control which dissolved substances enter the xylem.

Why is the xylem called exarch in a root?

In a root the protoxylem, the first xylem to mature, lies on the outside of each strand next to the pericycle, and the later metaxylem forms towards the centre. This places the first functioning conducting cells closest to the water arriving from the cortex.

How is a monocot root section different from a monocot stem section?

The root has radial bundles, with xylem and phloem on separate radii, inside a distinct endodermis and pericycle, and it has no cuticle. The stem has conjoint bundles scattered through ground tissue, each with its own sclerenchyma sheath, under a cuticle-covered epidermis. Students who confuse the two maize sections can check these points first.

Last Updated: September 2026