Transport in Plants Flashcards
What is the function of a Xylem?
Xylem transports water and dissolved mineral salts
What is the function of a Phloem?
Transport carbohydrates in the form of sucrose
Xylem Structure: Flows: Transports what substance: The cell does/does not have end walls Description of walls
One-way only,
water and minerals
no adjacent cell walls between cells
Thick walls stiffened with lignin
Phloem Structure:
Flows:
Transports what substance:
The cell does/does not have end walls
Two way flow
Cells have end walls with perforations
Transports food
What does the vascular bundle consist of?
Xylem. cambium, phloem
What is the function of the cambium?
layer of actively dividing cells between xylem and phloem tissues
Responsible for thickening stems and roots and forming woody tissue
Cross Section of Dicot Stem structure
Pith, Vascular Bundle, Cortex, Epidermis, Cuticle
What is are the unique features of a Monocot stem?
Scattered arrangement of vascular bundles
There is no cambium tissue
More vascular bundles are found at the periphery region
What is the endodermis?
Inner layer of cells in the cortex of a root and of some stems, surrounding a vascular bundle.
What is the function of the cuticle?
It is the outermost layer of leaves, fruits, and non woody stems and protects plants from environment.
What are the 3 types of tissue found in roots?
Epidermal Tissue
Ground Tissue
Vascular Tissue
What consists of a vascular bundle (stele)
Xylem & Phloem
What parts of the root are used for storage?
Vascular Bundle, Cortex, Endodermis
Phloem Structure (Detailed)
Made of sieve tube cells OR sieve tube elements
The sieve tube cells lack nucleus, vacuole, and most cell organelles, thus it is unable to maintain itself
Next to sieve tube cells are companion cells which aid in maintaining the sieve tube cells
Companion cells are living cells with functional plasma membrane, mitochondria, nucleus, and is capable of respiration to release energy
Xylem Structure (Detailed)
Made of tracheids and vessels
Dead Cells with no protoplasm; with adjacent cell walls broken down to form a continuous, thin & hollow tube.
Heavily lignified to provide strength
