Plant Hormones
stimulates stem elongation and seed germination
gibberellins
arrangement of vascular bundles arranged in ring in stem
dicot
movement in response to a stimulus that is not associated with the direction of the stimulus
nastic response
lack specialized tissue to transport water and nutrients
non-vascular plant
prevents water loss by transpiration
cuticle
promote stem elongation to maximize exposure to sunlight
Auxins
petals part in multiples of 3
monocot
growth response to external stimulus coming from 1 direction in the environment
tropism
do not have seeds; spread by wind blown spores
seedless plant
performs photosynthesis
palisade mesophyll
promotes cell division and prevents aging of leaves
cytokinins
structure of leaves are narrow and parallel
monocot
Response when plants grow towards the light
phototropism
plants mostly flowers; bear fruit; adapted to various climates
angiosperm
protects the plant and makes waxy cuticles for the plant
upper epidermis
Weakens cells walls and break down carbohydrates
ethylene
Contains taproot structure
dicot
plants natural growth response to the effects of gravity
Gravitropism
Have specialized tissue that help to transport water and nutrients
vascular plant
contains “guard cells” to allow air to enter leaf and water to leave
lower epidermis
Inhibits growth of buds in plant stems and blocks intake of carbon dioxide
abscisic acid
root xylem and phloem in a ring
monocot
Growth of plants in response to contact
thigmotropism
Contains an embryo surrounded by a seed coat
seeded plant
contain xylem and phloem
vein