vascular plants with seeds c9l3p2 plant tissues. tissue a group of similar cells working together to...
TRANSCRIPT
Vascular Plants with Seeds
C9L3P2
Plant Tissues
tissuea group of similar cells
working together to perform a particular function
A typical plant has 3 distinct kinds of tissue
• Dermal tissue
• Ground tissue
• Vascular tissue
Dermal TissueProtection
Prevent loss of water
Examples: epidermis, periderm
Ground TissueMetabolismStorageSupport
Examples: parenchyma, collenchyma, schlerenchyma
Vascular TissueTransport water and sugar
Examples: xylem, phloem
Vascular Tissue
The plant’s sap-conducting tissues
Two types: xylem & phloem
Xylem: transports water and dissolved minerals (one kind of sap) upward (long, thick-walled cells)
Phloem: transports food manufactured in the leaves (the other kind of sap) downward
Vascular TissueIn leaves and in non-woody plants, the xylem and phloem are usually arranged in vascular bundles (veins). Vascular bundles are often supported by thick-walled cells called fibers.
Fibrovasular bundles: xylem and phloem surrounded by supporting tissues
Two kinds of xylem cells are tracheids and vessel elements.
All vascular plants have xylem that is composed of tracheids.
Tracheid cells die at maturity, leaving a hollow tube that water can flow through freely.
Xylem
Xylem in flowering plants also includes cells called vessel elements.
The end of vessel elements have larger openings than those found in tracheid cells. Water can pass through easily.
Xylem
Another type of vascular tissue—phloem—carries dissolved sugars throughout a plant.
Phloem is composed of two types of cells—sieve-tube elements and companion cells.
Phloem
Sieve-tube elements are long, thin cells stacked end-to-end to form long tubes.
A companion cell helps control the functions of the sieve-tube element.
Phloem
Vascular Tissue
Vascular Tissue
XylemPhloem
Vascular Tissue
Vascular Tissue
Vascular TissueSunflowerStem
Vascular Tissue