Leaf structure and arrangement Flashcards
Each leaf typically has a ______, _______, _______, and ________.
leaf blade (lamina), stipules, a midrib, and a margin.
Some leaves have a _______, which attaches the leaf
to the stem.
Petioles
leaves that do not have petioles are
directly attached to the plant stem and are called
Sessile leaves
The arrangement of veins in a leaf is called the _______.
Venation pattern
monocots have a pattern of __________.
parallel venation
dicots have a pattern of __________.
reticulate venation
The arrangement of leaves on a stem is known as _______.
phyllotaxy
leaves can be classified as either ______, _______, _______, or ______.
alternate, spiral, opposite, or whorled.
Plants with _______ and ______ leaf arrangements
have only one leaf per node.
alternate, spiral
In a _______ leaf arrangement, two leaves connect
at a node.
opposite
In a ________ arrangement, three or more
leaves connect at a node.
whorled
stalk that extends from the stem to the
base of the leaf.
Petiole
the flat part of a leaf; the blade, which is the widest part of the leaf.
Lamina
small green appendage usually found at the base of the petiole.
Stipule
Each leaf typically has a leaf blade called the _______.
Lamina
It is the widest part of the leaf
Lamina
Most leaves have a _______, which travels the length of the leaf
and branches to each side to produce ______ of vascular tissue.
midrib, veins
The edge of the leaf is called the
margin
A leaf may seem simple in appearance,
but it is a ____________ structure.
highly-efficient
______, _______, _______, and a _______ are all essential structures of a leaf.
Petioles, stipules, veins, and a midrib
Within each leaf, the ___________ forms veins.
vascular tissue
the veins of the leaf have a net-like appearance
reticulate venation
the veins run in straight lines across the length of the leaf without converging
parallel venation
is an example of a plant with dichotomous venation.
Ginkgo biloba
the rarest venation pattern where the veins branch off from one another like the branches of a tree (Ex. Ginkgo biloba)
dichotomous venation
an example of a monocot that has leaves with parallel venation
Tulip (Tulipa)
an example of a plant with a reticulate venation
Linden (Tilia cordata)
The number and placement of a plant’s
leaves will vary depending on the ______, with each
species exhibiting a characteristic leaf arrangement.
species
leaves that alternate on each side of the stem in a flat plane
Alternate
leaves are arranged in a spiral along the stem
Spiral
two leaves arise at the same point, with the leaves connecting opposite each other along the branch
Opposite
