Chapter 13: Plant Systems and Homeostasis Flashcards
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
