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Designed by Pyeongsug Kim ©2008 [email protected]
SI OnlineAngiosperms
Cells and Tissues
Topic 21
Spring 2010
Dr. Hughey’s Bio 3 (Lab.)
______________ regions of tissue at the tips of shoots and roots that forms new cells.Apical Meristems
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Three Primary meristems Protoderm, Procambium, and Ground meristem
Three Primary tissues Dermal tissue, Ground tissue, and Vascular tissue
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3 Primary meristemsmeristems
Protoderm
Procambium
Ground meristem
Give rise to..Give rise to.. Primary TissuesPrimary Tissues
Give rise to..
Give rise to..
Give rise to..
Dermal Tissue
Vascular tissue
Ground tissue
Dermal tissueGround tissue
Vascular tissue
Tissue System –
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Dermal, Vascular, and Ground
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1) Epidermis Cell types - ____________________. Protection & __________
Dermal TissueDermal Tissue
Guard cells & Trichomes
_________- A hairlike or bristlelike outgrowth, as from the epidermis of a plant.
Trichomes
Trichomes
aeration
Guard cells
Stoma
Vascular Tissue #2• Phloem- principal food-conducting
tissue in vascular plants; living at maturity; not lignified.
• Gymnosperm Sieve Elements– Sieve cell- elongate & tapering; with
sieve areas. – Albuminous cell- elongate & tapering;
delivers substances to sieve cells. • Angiosperm Sieve Elements
– Sieve-tube element- elongate & tapering; with a sieve plate.
– Companion cell- variable; delivers substances to sieve-tube elements.
From Dr. Hughey’s Bio3 Slide
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Vascular Tissue - Vascular Tissue - Xylem & Phloem
XylemXylem- (Water-conducting / Food-conducting) tissue- Tracheary Elements ______________ ______________
PholemPholem-(Water-conducting / Food-conducting) tissue- Sieve Elements ______________________ in gymnosperm. ____________________________ in angiosperm
TracheidVessel element
Sieve cell & Albuminous cellSieve-tube element & Companion cell
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Xylem Pholem
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Xylem / phloemTracheid / Vessel element Found in …. -Seedless plant ____ -Gymnosperms ____ -Angiosperms ____
Perforation plate of Vessel element
Xylem / phloemTracheid / Vessel element Found in …. -Seedless plant ____ -Gymnosperms ____ -Angiosperms ____
Tracheid & fibers
Pits Pits(little dots)
No! No!
Yes! Yes! Yes!
Yes!
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Xylem
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Xylem / phloemGymnosperms / Angiosperms
Xylem / phloemGymnosperms / Angiosperms
Sieve Elements
A
B
Xylem / PhloemGymnosperms / Angiosperms
A:B:C:D:E:F:
E F
Cross section
Longitudinal section
C
D
Sieve-tube elements (mature)Companion cellsP-Protein(Phloem-protein)
ParenchymaSieve plateCompanion cellsP-Protein(Phloem-protein)
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Ground TissueGround Tissue Parenchyma, Collenchyma, & Sclerenchyma
ParenchymaParenchyma-Parenchyma cells- ______________, storage, and secretion
CollenchymaCollenchyma-Collenchyma cells- ______________________
Photosynthesis
Support young growing tissues
SclerenchymaSclerenchyma - ________________ -Support (strengthen) and storage.
Fibers and sclereids
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A B
C D
A:B:C:D:E:
EpidermisCortexPith (Parenchyma tissue)Vascular bundlePith rays
E
Sclerenchyma
Sclereid
A
B
D CE
A:B:C:D:E:F:
CollenchymaParenchymaParenchymaEpidermisCollenchymaVascular bundle
F
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A
B
CD
E
A:B:C:D:E:
Vascular bundle
ParenchymaPhloemVascular CambiumXylemPhloem
Dermal Tissues Dermal Tissues
Most epidermal cells lack chloroplasts.
Guard cells contain chloroplasts and regulate gas exchange between the inside of the leaf and the surrounding air.
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Tissue Systemand Its Functions
Component Tissues
Location of Tissue Systems
Dermal Tissue System• protection• prevention of water loss
EpidermisPeriderm (in older stems and roots)
Ground Tissue System• photosynthesis• food storage• regeneration • support• protection
Parenchyma tissueCollenchyma tissueSclerenchyma tissue
Vascular Tissue System• transport of water and minerals• transport of food
Xylem tissuePhloem tissue
From http://www.phschool.com/science/biology_place/biocoach/plants/tissue.html
Vascular Tissue
Xylem Tissue Phloem Tissue
Function • Conduct water and dissolved minerals• Support
• Conduct food and other organic substances
Cell Types Unique to This Tissue
Tracheids, Vessel members
Companioncells
Sieve-tubeelements
Picture from http://www.phschool.com/science/biology_place/biocoach/plants/vascular.html
Ground Tissue Parenchyma Tissue
Collenchyma Tissue
Sclerenchyma Tissue *
Function • Photosynthesis• Food storage• Healing and tissue regeneration
• Support in young stems, roots, and petioles
• Rigid support• Protection
Cell Types in This Tissue
Parenchyma cells
Collenchyma cells
Sclereid cells & fiber cells
*Some texts include tracheids and vessels as components of sclerenchyma tissue.
Picture from http://www.phschool.com/science/biology_place/biocoach/plants/ground.html
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