DESCRIPTION OF INTERACTIVE

Leaf Terminology

Upper Epidermis - Single layer of tightly packed cells with a thin waxy coating called a cuticle. The cuticle prevents water loss and creates a physical barrier to protect against insects and microorganisms. These cells do not contain chloroplasts,  so the layer is transparent and allows light to pass through.

Palisade Mesophyll - Elongated and closely packed cells that contain many chloroplasts. This is where the majority of photosynthesis occurs, as it has access to the light.

Spongy Mesophyll - Loosely packed cells with a large amount of airspace surrounding them. This airspace allows for gas exchange to occur between the mesophyll cells and the atmosphere through the pores.

Lower Epidermis - Single layer of tightly packed cells with a thin waxy coating called a cuticle. The cuticle prevents water loss and creates a physical barrier to protect against insects and microorganisms. This layer contains pores that allow CO₂ to enter the leaf and O₂ to exit.

Vein - A bundle of vascular tissue that transports water and nutrients to and from the leaf.

Guard Cells - Two kidney shaped cells that control the opening and closing of the stomata.

Stoma  - plural is stomata. A small opening or pore that allows gas exchange.

Each specialized tissue has a specific role to play. The structure or form of the tissues hopefully helped you determine its function.