Reading Quiz pages 19-22 Flashcards
group of structures designed to function together as a unit to perform a particular job for an organism
system
living things composed of more than one cell
multicellular organisms
a structure within a system that has a definite form and performs a definite function or functions for the system
organ
three basic leaf shapes:
- broad and flat
- long and narrow
- needle-like or scale-like
two parts of the simple leaf:
blade and the petiole (leafstalk)
flat portion of a leaf
blade
attaches the blade to the stem and contains vascular tissues that conduct substances between the blade and the stem
petiole
small leaf-like or scale-like structures that helped to cover the leaf when it was developing
stipules
contain developing leaf or stem structures
buds
have one blade on every petiole
simple leaves
have more than one blade on every petiole
compound leaves
points at which leaves grow from the stem
nodes
two leaves grow from each node
opposite arrangement
one leaf grows from each node in an alternating pattern up the branch
alternate arrangement
three or more leaves growing from each node
whorled arrangement