External & Internal Parts of Leaves

What is the definition of Leaf Base?

• The main structural axis of a plant, typically above ground, which supports leaves, flowers, and fruits, and through which nutrients and water travel.

• The angle between a leaf and the stem from which it grows. Buds or branches may develop in the axils.

• The lower part of a leaf where it attaches to the stem or branch.

• The stalk that attaches a leaf to a stem; it allows the leaf to orient itself to maximize exposure to sunlight.

Answer Carefully:

Also known as the lamina, it is the flat, expanded part of the leaf where photosynthesis primarily occurs.

What is the definition of Venules?

• The edge or border of a leaf blade.

• Small veins within the leaf blade.

• The pointed end of a leaf blade.

• Vascular tissue within the leaf blade that transports water, minerals, and sugars.

Answer Carefully:

The central vein of a leaf, extending from the base to the tip, providing structural support and transport of nutrients and water.

What is the definition of Epidermis?

• The outermost layer of cells covering the surface of a plant organ, such as a leaf, stem, or root.

• A tissue in the interior of the leaf, composed of loosely arranged cells with air spaces between them, facilitating gas exchange and photosynthesis.

• A layer of elongated cells containing chloroplasts, located beneath the upper epidermis of a leaf; it is involved in photosynthesis.

• Specialized cells surrounding each stoma that control the opening and closing of the pore, regulating gas exchange and water loss.

Answer Carefully:

A waxy, water-repellent layer covering the outer surface of the epidermis, which helps prevent water loss and protects against pathogens.

What is the definition of Xylem?

• Veins are responsible for transporting water, minerals, and nutrients throughout the leaf, facilitating photosynthesis and other metabolic processes. They provide structural support to the leaf and help maintain its shape and integrity.

• Vascular tissue responsible for transporting sugars, amino acids, and other organic compounds produced through photosynthesis to various parts of the plant.

• Microscopic pores found on the surface of leaves and stems, surrounded by guard cells, which regulate gas exchange (including carbon dioxide uptake and oxygen release) and water vapor loss.

• Vascular tissue responsible for transporting water and minerals from the roots to the rest of the plant.

Answer Carefully:

The lower part of a leaf where it attaches to the stem or branch.

What is the definition of Petiole?

• The stalk that attaches a leaf to a stem; it allows the leaf to orient itself to maximize exposure to sunlight.

• The angle between a leaf and the stem from which it grows. Buds or branches may develop in the axils.

• Also known as the lamina, it is the flat, expanded part of the leaf where photosynthesis primarily occurs.

• Small veins within the leaf blade.

Draw a Leaf