Leaf morphology Flashcards
leaf functions
photosynthesis
avoid lsoing water
prevent fungal infections
avoid being eaten
produce energy net gain for plant
Energy net gain
leaf needs to produce more carbs than it takes to maintain the leaf
Leaf blade
wide flat part of leaf
photosynthesis
petiole
stalk of the leaf
attaches leaf to stem
is the petiole a branch
no
does the petiole help prevent shading
yes
stipules
small leaf like flaps of tissue
can affect where energy is sent
are stipules the same as bud scales
no
do stipules help protect the young bud
yes
ventral surface
top of leaf
adaxial
ventral top
how to tell the adaxial side of a leaf
if the midrib is sunken in
dorsal surface
bottom of leaf
abaxial
dorsal bottom
what do the leaf veins contain
bundles of vasc tissue
venation
how the veins are arranged in a blade
pinnately reticulate venation
one major center vein
palmately reticulate venation
like palms
branching major veins
simple blade
many shapes, one part
oak?
compound blade
subdivided into leaflets
rachins
extnesions of the pediole
pinnately compound leaves have rachis
Basically at the bottom of the petiole
rachins
extensions of the pedicle
pinnately compound leaves have rachis
Basically at the bottom of the petiole
do palmately compound leaves have rachis
no bc those are petioles
leaflet
small individual leaves
never have a bud on their axis
are leaflets on every type of leaf
only with compound leaves
petioule
stalk that attaches to the leaflets to the rachis
pinnately compound
leaflets attached to rachis
palmately compound
all leaflets are attached to the same orgin point
do palamtely compound leaves have rachis
no
phyllotaxy
the arrangement of leaves and axillary buds on a stem
related plants = similar or different phylotaxy
similar
whorled leaves
three or more ondes of leaves
sheath
base of leaf wraps around stem
are sheaths in mostly monocots or dicots
monocots
ligule
narrow outgrowth of tissue at the junction of the blade and sheath
whats the function of the ligule
no one knows yet
auricle
projections from base of a monocot base
angle
– be able to label monocot and dicot plant
-
what is the venation in monocots
parallel
are grasses simple or compound leaves
simple
are palms simple or compound leaves
compound leaves
leaf abscission zone
region of cells at the base of petiole1
What happens at the leaf abscission zone
the cells secrete an enzyme to dissolve the middle lamella
are the vasc bundles broken down by the enzyme that dissolves the middle lamella
no
broken by wind and rain
what is the process of the leaves falling in autunm
leaf absission
