Plant Leaves Flashcards
Arises from the shoot apical meristem
Plant leaves
is the first indication that a new leaf is on its way to maturity
Leaf primordia
A ______ elongates until a flattened blade appears
bulge
Another term for bulge
leaf buttress
The petiole has two-leaf like flaps called
stipules
Leaves that are directly attached to the stem
Sessile leaves
Cells of the top layer of the leaf are collectively known as _____
epidermis
Function of epidermis
protect leaves from water loss, abrasions, and entry of microorganisms
regulates exit and entry of gases
stomata
On each side of the stomata are the ____ which opens and closes
guard cells
When water is present, guard cells ______ allowing stomata to open
swell
a waxy layer that covers the leaf blade
cuticle
Cover to prevent invasive microorganism
cuticle
plants that form symbiotic relationships wit fungi
endophytes
Other name of leaf hair
Trichomes
function of trichomes
prevent water loss, regulate heat, and may contain toxic substances
In between the upper and lower epidermis
mesophyll
Where photosynthesis takes place
mesophyll
A picket one layer thick
palisade mesophyll
Vascular bundles inside the petiole and leaf blades
leaf veins
Leaf veins form under the influence of what hormone?
auxin
web-like formation of veins
netted-venation
Goes from petiole to the lead apex in straight unidirectional lines
parallel pattern
Parallel venation is also called _____
Striate venation
Arrangement of the leaves is called _____
Phyllotaxy
response of plants to touch
Thigmotropism
what allows floating leaves to remain buoyant
extra cells in between the mesophyll
Why is stomata found underneath the leaf blade
to avoid too much loss of water when exposed to sunlight
Upper epidermis
Xylem
Lower epidermis
Phloem
