secondary growth Flashcards
what is secondary growth
lateral growth, increases girth
area of secondary growth
lateral meristem
two types of meristem tissues
vascular cambium - adds xylem and phloem
cork cambium - adds bark
what does apical meristem produce
protoderm - epidermis
ground meristem - cortex
pro cambium- vascular cylinder
pericycle
area of mitosis that produces cork cambium and vascular cambium, surrounds vascular cylinder
cork cambium
produces cork (periderm) and phelloderm
vascular cambium
produces secondary phloem on outside and secondary xylem on inside
what happens as growth occurs
cortex and epidermis get sloughed off, and periderm (bark) replaces epidermis
sapwood and heartwood
inner and outer bark
monocots
lack secondary growth
ray initial and fusiform initial cells
both divide into xylem and phloem, but into different directions
when does phloem become nonfunctional
as you get closer to the wood
is ring growth always symmetrical
no,
ex: reaction wood
