Plant Structure and Tissue Organization Lab

Vocabulary practice flashcards covering plant cell structures, primary tissues, and organ anatomy across roots, stems, leaves, and flowers.

Dermal tissue

The outermost protective layer of plant tissue (often called the epidermis) that shields the plant from the environment and reduces water loss in stems and leaves.

Vascular tissue

The plant tissue system responsible for transporting water, minerals, and carbohydrates throughout the plant; it also provides skeletal support in stems to withstand gravity.

Ground tissue

Any plant tissue that is neither dermal nor vascular; it connects dermal and vascular tissues, provides structural support, and stores nutrients such as carbohydrates.

Xylem

Vascular tissue specialized for transporting water and dissolved minerals from the roots throughout the plant.

Phloem

Vascular tissue specialized for transporting sugars and metabolic carbohydrates between plant organs.

Root Apical Meristem (RAM)

A cluster of actively dividing cells located at the tip of the root responsible for primary root growth.

Root cap

A protective covering over the root apical meristem that shields dividing cells from environmental damage as the root lengthens through the soil.

Stele

The central cylinder or inner region of the root that contains the vascular tissues (xylem and phloem).

Cortex (root)

The outer ring of ground tissue located between the dermal tissue and the stele, composed of parenchyma cells that store sugars and nutrients.

Parenchyma cells

Metabolic plant cells with large central vacuoles that function primarily in storing nutrients, sugars, and carbohydrates.

Collenchyma and Sclerenchyma

Cell types situated near the outermost part of the stem that provide structural support and rigidity to the plant.

Shoot Apical Meristem (SAM)

A region of actively dividing cells located at the terminal growing tip of the stem.

Monocot stem vascular arrangement

A stem organization characterized by vascular bundles that are scattered randomly throughout the ground tissue.

Dicot stem vascular arrangement

A stem organization characterized by vascular bundles arranged in a defined ring, dividing the ground tissue into an outer cortex and an inner pith.

Pith

The central ground tissue found in the interior of a dicot stem or monocot root, surrounded by vascular tissue.

Mesophyll

The photosynthetic ground tissue of a leaf located between the upper and lower epidermis, comprised of palisade and spongy layers.

Palisade mesophyll

Tightly packed, rectangular-shaped photosynthetic cells located beneath the upper epidermis where sunlight strikes the leaf.

Spongy mesophyll

Loosely arranged cells located in the lower portion of the leaf with air spaces that facilitate gas exchange.

Cuticle

A thick, waxy protective layer produced by the upper epidermis that prevents or reduces leaf water loss.

Stoma

A microscopic pore situated primarily in the lower epidermis of a leaf that allows gas exchange.

Guard cells

Specialized epidermal cells flanking each stoma that regulate opening and closing for gas exchange and transpiration.

Bundle sheath cells

An outer protective cellular jacket that encloses the xylem and phloem within leaf veins.

Starch granules

Carbohydrate storage organelles in potato tuber cells that turn dark purple upon staining with iodine.

Elodea leaf cells

Aquatic plant cells containing observable rigid cell walls, large central vacuoles, and chloroplasts undergoing cytoplasmic streaming.

Stamen

The pollen-producing male reproductive organ of a flower, consisting of a filament and an anther.

Carpel

The female reproductive organ of a flower, consisting of the stigma, style, and ovary.