Chapter 22 Vocabulary Flashcards
tropism
a plant’s growth response to an external stimulus
nastic responces
a plant’s responce that causes movement that is not dependent on the direction of the stimulus
cytokinins
rapidly dividing cells
ethylene
The only gaseous plant hormone, responsible for fruit ripening, growth inhibition, leaf abscission, and aging.
gibberellins
group of plant hormones that are transported in vascular tissue and that can affect seed growth, stimulate cell division, and cause cell elongation
auxin
one of the first plant hormones to be identified
transportation
water evaporates from the inside of a leaf to the outsides though stomata
spongy mesophyll
consisting of irregularly-shaped, loosely packed cells with spaces surrounding them
palisade mesophyll
contains many chloroplast and makes up the tissue
petiole
depending on the plant species, the blade might be attached to the stem by a stalk
pericycle
The layer of cells directly next to the endodermis toward the center of the root
endodermis
Inner boundary of the cortex is a layer of cells
cortex
the layer below the epidermal layer
root cap
the tip of the primary root that has several layers of cells which protects the root as it grows through the soil
ground tissue
consists of paraenchyma, collenchyma, and sclerechyma
companion cells
the active cells found next to sieve tube elements that supply the phloem vessels with all of their metabolic needs
sieve tube member
contains cytoplasm but lacks a nucleus and ribosomes when it is mature
pholem
main food carrying tissue
tracheid
long, cylindrical plant cell in which water passes from cell to cell through pitted ends
vessel elements
tubular cells that are stacked end-to-end, forming strands of xylem called vessels
xylem
water carrying vascular tissue
guard cell
the two cells that form a stoma
epidermis
outer covering on a plant is dermal tissue
cork cambion
produces cells that develop tough cell walls
