Transcript Slide 1

A cross-section of a plant leaf. Notice the cuticle on the outermost layer
(dermal tissue), the Phloem and Xylem (Vascular tissue), and the
stomata on the underside of the leaf (dermal tissue).
Stomata – electron
micrograph of the
stomata.
Stomata are made up
of 2 guard cells that
rely on turgor pressure
in the cell to open or
close. In both of these
pictures, there is
excess water and
therefore the cells will
expand and open the
hole, allowing water to
leave the plant.
Phloem
Xylem
Lateral meristem tissue makes the plant grow in diameter. This is important
because it allows the plant to support its height. This is why trees can grow
to be so tall!!
Also, these rings tell a lot about the health of the tree and how old it is!
Monocot
Seed Monoocots have 1
seed leaf and dicots have 2!
These seed leaves are called
cotyledons
Flowers Monocots
have 3 petals or multiples of 3
and dicots have 4-5 or
multiples
Leaves Monocots
have parallel veins and dicots
have a network of veins
Pollen Monocots have
1 furrow and dicots have 3
Stems Monocots have
interdispersed vascular
bundles and dicots have a ring
of vascular bundles
Dicot
In most monocot stems,
vascular systems are scattered
throughout
In Dicot stems, vascular systems
have a ring-like arrangement