Chapter 7 Flashcards
Leaves
All leaves originate as
primordia in the buds
Petiole
Stalk that attaches leaf to twig
Blade/Lamina
Flattened actual leaf part, contains a network of veins called vascular bundles
Leaves that lack petioles are called
sessile
deciduous
The leaves of these trees live only one year.
Simple Leaf
has a single blade
Compound Leaf
the blade is divided various ways into leaflets
Regardless of the number of leaflets, a compound leaf still has
a single axillary bud at its base, the leaflets do not
Pinnately Compound
have the leaves in pairs along an extension of the petiole called the rachis
Rachis
Extension of the Petiole
Palmately Compound
have all the leaflets attached at the same point at the end of the petiole
Stomata
primarily found on the bottom of the leaf, small pores that play an essential role in gas exchange
Stomatal Apparatus consists of
a pore bordered by a pair of sausage shaped guard cells. Controls water loss when guard cells inflate or deflate
Transpiration
Most water evaporates in vapor form into the atmosphere through this process
Hydathodes
Found at the tips of leaf veins
Root openings force
Liquid water out of hydathodes, this is called guttation
Nodes
Region at which the leaf is attached to the stem