General Science - THE INTERNAL STRUCTURE OF A LEAF

(10-14-2025)

Tissue

It is a group of cells or fluid that work together to perform a specific job in the body

Structural, Vascular, and Meristematic Tissue

Three (3) types of tissues in plants:

Structural Tissue

• A type of tissue that provides support and shape to the body or to specific organs.

Epidermal Tissue, cork, and parenchyma

Types of structural tissues:

Epidermal Tissue

• Protects and covers leaves, roots, stems and other exposed areas and prevents excessive water loss and injury by outside agents.

Cuticle

• It contains waxy substance that help seal in water.

Root Hair

• It absorbs nutrients and water for the root.

Cork cambium

It is a meristematic tissue in woody plants responsible for producing cork cells during secondary growth, which forms the protective outer bark in stems and roots.

Parenchyma Tissue

• Composed of thin-walled cells and makes up the photosynthetic tissue in leave.

Vascular Tissue

•Can be found in stems and roots, and in the veins and petioles of leaves.

Xylem and Phloem

Two (2) types of Vascular Tissues:

Xylem

It is the vascular tissue in plants that conducts water and dissolved nutrients upward from the root and also helps to form the woody element in the stem.

Phloem

It is the vascular tissue in plants that conducts sugars and other metabolic products downward from the leaves.

Sap

• Sweet liquid found within the vascular tissue of plant.

Water with dissolved minerals and Food Materials

Two (2) types of sap:

Water with dissolved minerals

Sap that moves upward from the roots to the leaves.

Food Materials

Sap that have been made in the leaves and dissolved in a small amount of water to be transported downward to the stem and roots.

Meristematic tissue

• Its purpose is for growth and repair of plants.

• Consist of rapidly growing and dividing cells.

• It is not spread evenly throughout the plant but is present in definite growth regions.