Ground Tissues Flashcards
what are the ground tissues?
parenchyma
collenchyma
sclerenchyma
most basic tissue
parenchyma
parenchyma functions (5)
photosynthesis storage support (if turgid) production of other tissues (totipotent) production of secondary metabolites (goes with storage)
parenchyma location?
everywhere, daddio
aerenchyma is a type of
& what is it
parenchyma
have huge intracellular air spaces for buoyancy, usually in aquatic plants
aerenchyma can result from
schizogeny (splitting apart) or lysogeny (cell death) of parenchyma cells
aerenchyma allows for (2)
floating/buoyancy
& oxygenation
parenchyma cells only have
1* cell walls
collenchyma function
primarily in support of young growing tissues or plants with low amounts or no wood (ex: celery, nopalitos)
collenchyma cells only have
unevenly thickened 1* cell walls
collenchyma cells don’t have (2)
lignin
2* cw’s
collenchyma cells are rich in
pectin & hemicellulose
collenchyma shape
angular and lamellar
collenchyma are
plastic
sclerenchyma function
support tissue
sclerenchyma cell traits (3)
2* cw’s
- usually lignified
- often several layers
sclerenchyma cells at maturity
can be dead or alive
sclerenchyma are
elastic
2 types of sclerenchyma
sclereids
fibers
sclereids are
usually derived from parenchyma cells
sclereids with intrusive growth
asterosclereids
trichosclereids
brachysclereids retain
overall shape of parenchyma cells they derived from
sclereids usually occur
in the outer regions of the stem (cortex), inner regions (pith), and leaves
fibers shape
elongated & tapered at the ends
fiber growth =
intrusive
fibers often associated with
vascular tissue
fiber strength
extremely strong
fibers form from
parenchyma or are produced with vascular tissues (to protect it)
fibers located
stems & leaves
fibers may be evolutionarily derived from
water transport cells
