Chapter 13: Plant Systems and Homeostasis Flashcards
(22 cards)
germination
the process by which the plant embryo emerges from the seed
geotropism
growth in response to gravity (the plant grows downwards first)
coleoptile
a protective sheath that covers the meristem of young monocots; the first part of a monocot to emerge from the ground during germination
sap
a fluid containing sucrose, some minerals, and organic molecules that is transported through plants
apical meristem
a region of embryonic, undifferentiated cells that actively divide allowing the plant to grow in length
suberin
a waxy, waterproof substance found in plants
vascular ray
channels materials from the phloem to the center of the stem
bark
the layer of a dicot stem consisting of phloem, cork cambium, and cork
homeostasis
maintaining a stable internal environment
behavior
responding to a stimulus
thigmotropism
directional growth in response to physical contact
phototropism
growth towards light
gravitropism/geotropism
growth in response to gravity
signal-transduction
a method of generating a cellular response by means of a chemical or physical stimulus
auxin
a group of plant hormones involved in cell elongation and plant growth
circadian rhythm
a physiological cycle, about 24 hours in length, that is present in all eukaryotes
photoperiodism
a physiological response to day length
behavior
response to a stimulus
transpiration
the loss of water through evaporation from a leaf
plasmodesmata
open channels in plant cell walls connecting adjacent channels together
hyphae
thin, hairlike filaments that form the body of a fungus
hypertonic
a solution with a higher concentration of solute than another
