Secondary Growth Flashcards
”” has vascular bundles arranged in a cylinder. You can only have a vascular cambium if the vascular bundles are arranged in a cylinder.
Dicot
in “” there is only primary tissue such as primary phloem (that is on the outside) and primary xylem (that is on the inside). Parenchyma is in between the bundles. Here there is only the procambium, parenchyma and vascular bundles.
early stage
What does the Procambium become?
Fascicular cambium
Where does the Fascicular cambium come from?
Vascular bundles
In order for their to be a complete ring in a dicot stem, parenchyma cells start to divide and form the “”
interfascicular cambium
When the fascicular cambium starts dividing secondary phloem will go to the outside and secondary xylem will go to the inside. (True/False)
True
Where does the interfascicular cambium sit between?
vascular bundles
the vascular cambium is “” growth
secondary
the vascular cambium and cork cambium are “” meristems that are formed in stems and roots after the primary tissues have differentiated.
secondary
secondary growth starts when the stem gets “”
wider
apical meristem is “” growth
primary
the “” that the vascular cambium makes gets really wide, but will get harder and harder to grow as time goes on where there will be smaller widths of tree rings.
first tree ring
What are the 4 stages of xylem development?
- cell division in the cambium 2. cell expansion 3. secondary cell wall deposition (cell wall strengthening) 4. cell death
you will only see “” in xylem
lignin
In xylem development, after the building up of cell walls the cell then dies where the “” main function will be for water transport
vessels
(True/False) actively dividing cells have thinner cell walls
true
all the bark that is produced outside of the “”
vascular cambium
whats on the inside of the vascular cambium is “”
wood
the outermost layer?
periderm
which secondary transport tissue has the most cells?
secondary xylem
what are xylem growth rings?
tree rings
The “” is created by the cork cambium another secondary meristem.
periderm
”” produces cells to the inside (phelloderm) and the outside (cork)
cork cambium
what are the three functions of the periderm?
- protection from water loss
- protects the stem from pathogens
- protection from fire
”” makes cork to the outside
cork cambium
is it typical for a meristem to have thin cell walls?
yes
what do lenticels do?
gas exchange
provides a pathway for the exchange of gases between the internal tissues and atmosphere through the bark, which is otherwise impermeable to gases.
Lenticels
what is the outermost layer of a stem undergoing secondary growth?
periderm
