Secondary Growth Flashcards
Is pith parenchyma present in the three year old stem?
Yes
How are the vascular bundles arranged in a woody dicot?
In a ring
What will eventually happen to the pig parenchyma?
Gets smashed and overridden by xylem so non-existent
Whin is the oldest growth ring?
Innermost
How do you know which growth ring is the oldest?
Closest to the pith
Distinguish between spring and summer wood
Spring has larger vessel elements than summer
If large cell size indicates a fast growth rate, which season of wood grows faster?
Spring wood
What causes growth rings?
Differences in water availability
Do older roots have secondary growth?
Yes
Are cork cells living or dead?
Dead
Are the cell walls of col cells thick or thin?
Thick
Compare the cell plume of the outer layers of cork to the inner layers
More smaller cells on the outer layers and inner layers have larger cell volume
Are growth rings present in the cork?
No
If cork is a major component of bark, will the outermost layer of bark be the same age as the innermost layer of wood?
No because bark is shed each year and new bark is grown
List the functions of cork
Insulation and protection
What role does Suberin play?
Insulation and protection
List all the tissues found in bark in order starting at the vascular cambium
Vascular cambium
Phloem
Cork
What makes up wood?
Xylem
Which cut is used to fell a tree?
Transverse
Which cut is most commonly found in the lumber purchased from a lumber yard?
Tangential
What distinguishes transverse cut?
Rings
What distinguishes radial cuts?
Goes through the center
What distinguishes tangential cuts?
Not through the center
What is the origin of secondary xylem and phloem?
Fasicular cambium
Interfasicular cambium
What is the origin or cork and phelloderm?
Cortex parenchyma
What secondary meristem does the secondary xylem and phloem come from?
Vascular cambium
The fasicular and interfasicular cambium make up what?
Vascular cambium
