Leaf anatomy Flashcards
what type of cells is the epidermis made out of
epidermal cells
what color is the epidermis
clear- it lets sunlight pass through
what molecule makes the epidermis waterproof
cutin
Guard cells
surround stomatal pore
opens and closes it
Are guard cells epidermal cells
yes
Guard cell + stomatal pore =
stomata
Trichomes
hair like extensions of epidermal cells
are trichomes single cellular or multicellular
both
how do trichombes help prevent water loss from a leaf
hairs = shade = cooler temp = humidity barrier = water not going from more to less = water staying in the plant if it’s wet out
what types of plants have glands at the tips of their trichombes
plants that secrete digestive enzymes or irritants, or carnivorous plants
do plants produce more or less tricombes during a drought
more- humidity barrier
TF ichombes have little to no dictyosomes in them
f
whats on top / bottom of vasc bundles in leaves
x on top
p on bottom
do leaves have a vasc cambium
no- only in woody plants
what surrounds the vasc buncles in leaves
bundle sheath
is th ebundle sheath in dicot stems
no
purpose of the bundle sheath
protect vasc bundles and control movement between water and sugars
mesophyll
all leaf tissue that is not the vasc bundles and epidermus
palisade mesophyll
between upper epidermis and vasc bundles
Top
what is the main site of photosynthesis (type of tissue in leaves )
palisade mesophyll
spongy mesophyll
parenchyma cells
bottom
is the spongy mesophyll tightly or losely packed
loose bc CO2 diffuses through pores
where is the apical meristem in dicots
mostly at top of plant
where is the apical meristem in monocots
mostly bottom- crown of plant
is there spongy or palisade mesophyll in monocots
none, just mesophyll
are motor cells in monocots or dicots
mono
what type of cells are motor cells
bulliform cells
function of motor cells
swell and shrink- causes plant to move
curl up
where are motor cells in th eplant
in upper epidermis of leaves
How do motor cells respond to drought
leaves curl when vacuoles lose water
less surface area = less potential to lose water
what element moves into guard cells during the day
potassium
do stomata stay open during the day
yes unless theres drought stress
K moves in bc
water follows K
transpiration
loss of water frm a plant
how does transpiration occur
through open stomata
plants have to be able to replace the water they lsoe tf
t
guttation
loss of liquid water from plant
drops ontop of leaf
hydathodes
what guttation is releasaed from ontop of leaf
where are hydathodes found
along the edges of leaves
hydathode anatomy
pore at the edge of a leaf with terminal tracheid
when does guttation occur
a lot of water pressure in plant
Does guttation occur in the day or night
night
bc stomata closed
does high or low humidity increase guttation
high
transpiration depends on evap which is reduced in humid conditions
