UNIT 9: CELL TYPES

Study Questions  Lecture Outline
Return to Bio 205 Main Page

KEY WORDS

Meristem Sclerenchyma Guard Cells Protoderm
Vascular Cambium Fibers Trichomes Ground Meristerm
Cork Cambium Sclereids Ficus Provascular Tissue
Dermal Xylem Subsidiary Cells Region Maturation
Parenchyma Vessels Periderm Endodermis
Cortex Tracheids Cork Casparian Strip
Pith Phloem Suberized Triarch
Ray Sieve Tube Members Cork Cambium Pericycfle
Grafting Sieve Plates Phelloderm Lateral Roots
Adventitious P-Protein Tap Root Prop Root
Transfer Cell Companion Cells Fibrous Roots Pneumatophores
Collenchyma Albuminous Cells Root Cap Velamen
Celery Epidermis Quiescent Zone Supernumerary

STUDY QUESTIONS

UNIT 9: CELL TYPES

1 - Specialized type of nuclear division which forms two identical daughter    
    cells 
    formation

2 - Genaral term for an area of localized cell division

3 - A lateral meristem

4 - Most common cell type found in the cortex

5 - Cell type found in the pith

6 - Cell type which is thin-walled and capable of division

7 - Specialized cell type which is characterized by ingrowths of the membrane  
    and cell walls

8 - Cell type which has a thick primary wall

9 - Cell type found as support cells in celery "strands"

10 - Tissue type which is characterized by thick, lignified cell walls

11 - Elongate cells with thick secondary walls

12 - Cell type commonly associated with bundle caps

13 - Plant which produces fibers used to produce linen

14 - Cell type of stone cells

15 - Non-living cell type which has a support function

16 - Xylem conducting element which has intact end walls

17 - A pattern of wall thickening found in first-formed vessels

18 - Conducting cell type found in the phloem

19 - Cell type which is the primary site of sugar transport

20 - Cell type which produces p-Protein

21 - Enucleate, living conducting cell type

22 - Cell type which is thought to control solute movement in sieve tube cells

23 - Wax produced by epidermal cells

24 - Epidermal cells which contain chlorophyll

25 - Term which includes the cork cambium and it's derivatives

26 - Outer layer produced by the cork cambium



LECTURE OUTLINE

UNIT 9: CELL TYPE

A - Process - cell division involves:
   1 - Division of nucleus - mitosis
   2 - Division of cytoplasm - cytokinesis


B - Location - meristems - localized area of cell
   1 - Cell division
       a - apical - primary tissue
                    Root and stem tip
   2 - lateral meristems - secondary tissues
       a - vascular cambium
       b - cork cambium

C - Cell differentiated on basis of
       a - structure - morphogenesis
       b - chemical - alkaloids, etc.

D - Cell division and cell differentiation
       a - results in cell types
           (1) parenchyma - thin-walled pith, cortex, fleshy fruits,
               wound healing, transfer cells      
       b - collenchyma - thick primary wall, living, strings in celery
       c - sclerenchyma -thick, lignified, secondary walls, support,
           non-living
           (1) fibers - elongate
               hemp, jute
           (2) schereids - store cells, short, thick
       d - xylem - conduction of water and minerals
           (1) vessels - perforate (open end walls) secondary wall 
               thickening patterns - helical, pitted, lack protoplast,
               forms continuous column
           (2) tracheids - have end walls, secondary walls, found in
               Gymnosperms
       e - phloem - food conducting, primarily sucrose
           (1) sieve tube members - sieve plates end wall
               callose, living enucleate, p-protein
           (2) companion cells - contain nucleus, control movement of
               materials into and out of sieve tube members
       f - epidermis - waxy cuticle, no chloroplasts, water-proofing
           (1) guard cells - chloroplasts, transpiration
           (2) trichomes - hairs, cotton, essential oils
       g - periderm - woody plants
           (1) cork - non-living, subersized
           (2) cork cambium - phellogen
           (3) phelloderm - living parenchyma

Return to Bio 205 Main Page