Dicot Leaf Biology Chart

Quick Answer: The Dicot Leaf Biology Chart is a botany wall chart showing the structure of a typical dicotyledonous leaf, with its lamina, petiole and net venation and a dorsiventral vertical section through palisade and spongy mesophyll, veins and stomata. Biology teachers use this dicot leaf chart for lessons on leaf anatomy and photosynthesis.

How a Dicot Leaf Is Layered for Light

A dicot leaf is held roughly horizontal, with one face towards the sun, and its internal structure reflects that. The section on a chart like this, often based on a sunflower or mango leaf, runs from a thick, waxy cuticle on the upper epidermis to a thinner one below. The upper epidermis usually has few stomata or none, while the lower epidermis carries many, each flanked by two bean-shaped guard cells.

Between the two epidermal layers lies the mesophyll, divided in two. Tall, tightly packed palisade cells full of chloroplasts sit under the upper surface where light is strongest; below them, irregular spongy cells leave large air spaces connected to the stomata, through which carbon dioxide diffuses in and water vapour diffuses out. This difference between upper and lower halves is what dorsiventral means.

Veins appear as vascular bundles cut across, the largest in the midrib. In each, xylem lies towards the upper surface and phloem towards the lower, surrounded by a bundle sheath. The external view usually adds lamina, petiole, leaf base, stipules where present and reticulate venation, linking what students see on a real leaf to what they see under the microscope.

Care & Handling

• Put the dicot leaf chart up at the start of the photosynthesis topic; students keep returning to the palisade and air-space labels throughout the unit.
• Carry it by the top edge or hanging rail when moving it; creases across the section diagram are hard to flatten.
• Store it rolled with a band, never folded.

Specifications

Applications

• Teaching how leaf structure supports photosynthesis and gas exchange
• Explaining transpiration, with the lower-surface stomata as the main exit for water vapour
• Checking students’ own leaf sections or epidermal peels against the labelled diagram
• Comparing with a monocot leaf section to contrast dorsiventral and isobilateral leaves

Why Choose LabEquip

Biology teachers covering photosynthesis and plant anatomy are the usual buyers, often together with the Botany Monocot Leaf Chart so both leaf types can be compared. Browse other titles in the Educational Charts range, or send a full list for a single order through the contact page.

Frequently Asked Questions

What does dorsiventral mean for a leaf?

Dorsiventral means the upper and lower halves of the leaf are built differently. The upper side has a thicker cuticle and palisade tissue, while the lower side has spongy mesophyll with air spaces and most of the stomata. It suits a leaf held flat with one face to the sun.

Why is the lower surface of many leaves paler than the upper surface?

The palisade cells under the upper surface are densely packed with chloroplasts, so the upper side looks deep green. Underneath, the spongy mesophyll has fewer chloroplasts and many air spaces that scatter light, making the lower surface look lighter.

Why does the xylem face the upper side of the midrib?

The leaf’s veins continue from the stem, where xylem lies towards the centre and phloem towards the outside. As the vascular strand bends out into the leaf, the side that faced the stem centre becomes the upper side, so xylem ends up above the phloem.

What are the air spaces in the spongy mesophyll for?

They form a connected internal atmosphere that links every mesophyll cell to the stomata. Carbon dioxide diffuses in through these spaces to reach the photosynthesising cells, while oxygen and water vapour diffuse out. Without them, gas exchange would be far too slow.

What is the role of the cuticle?

The cuticle is a waxy, waterproof layer secreted by the epidermis. It reduces water loss from the leaf surface and helps keep out fungal spores. It is usually thicker on the upper surface, which faces the sun, and especially thick in plants of dry places.

Which dicot leaf is suitable for a practical section?

Firm leaves such as sunflower or young mango leaves section well. Place a strip of leaf, cut across the midrib, between two halves of a potato block and slice thinly with a sharp blade. Stain lightly with safranin and compare the tissues with the chart.

Last Updated: September 2026