Lab 3 Flashcards
Lateral meristems
In perennial plants, secondary growth from the lateral meristem
Two regions with expansion
In secondary growth cells divide into two lateral meristems
-vascular cambium and cork cambium
What does Vascular cambium produce?
Produces secondary xylem and secondary phloem
-adds girth/rigidity
What does the cork cambium produce?
Periderm tissue
-adds girth/rigidity
What do all conifers produce?
primary and secondary growth
Monocot growth?
Usually only primary
Leaf scars
a mark left after the loss of leaves
Vascular bundle scars
Vascular bundles that existed in an old leaf petiole also form scars
Bud scale scar
-narrow band around stem
-formed each year
-the age of the branch determined this way
Lenticels
In woody stem periderm, areas with loose cells that allow air to pass through bark
Fascicular cambium
Cells in the middle of vascular bundles that are meristematic and divide to produce procambial cells called fascicular cambium
Interfascicular cambium
Pareenchyma cells in ground system between bundles are meristematic and divide to produce procambial cells called interfascicular cambium
Vascular cambium forms by joining
Interfascicular cambium and fascicular cambium
-will produce secondary xylem on the inside and secondary phloem on the outside
What happens to the epidermis as the stem increases in girth
It will split
What is done to prevent water loss when the epidermis splits?
A new dermal layer known as the periderm is produce to replace the epidermis
