Plant
Tissues
Tissues
Covers and protects the plant surface
dermal
this process pulls water upward through xylem due to evaporation in leaves
transpiration
the main organ of photosynthesis in most plants
leaf
promotes stem elongation and phototropism
auxin
growth response toward light
phototropism
transports water and minerals upward
xylem
movement in water from roots caused by osmotic pressure
root pressure
pigment responsible for capturing light energy
chlorophyll
stimulates cell division
cytokinins
growth response to gravity
gravitropism
transports sugars throughout the plant
phloem
tin openings on leaves that regulate gas exchange
stomata
leaf layer that performs most photosynthesis
palisade mesophyll
promotes stem elongation and seed germination
gibberellins
growth response to touch
thigmotropism
is responsible for photosynthesis and storage
ground tissue
cells that open and close stomata
guard cells
loose leaf layer allowing gas exchange
spongy mesophyll
responsible for fruit ripening
seasonal loss of leaves
abscission
regions where new plant cells are produced
meristem
theory explaining how water moves upward in xylem
cohesion-tension theory
leaf veins containing xylem and phloem
vascular bundles
seasonal loss of leaves
abscisic acid
temporary halt of plant growth during harsh conditions
dormancy