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Be e554, dnd’.
fect 1 ae
Be Plein “Sas
Guard
cell
Epidermal cell Epidermal cell
Guard cell
Thickened
inner wall of
\ guard cell
}
|
Root hairs
|
Figure 37-8 Biological Science, 2/e
© 2005 Pearson Prentice Hall, Inc.
Vascular
Phloem C6 vex
Water and \_
solutes
Casparian
strips
Endodermal
cells
(a) Water travels from root hairs to xylem via (b) The Casparian strip blocks the
two routes. apoplastic route at the endodermis.
Blockage at
Casparian strip
Symplastic 5% ; Cy) 2 _vessels
route ; . -
LH yet
Cortex Endodermis Pericycle Xylem vessels Cortex Endodermis Pericycle
Figure 36-8 Biological Science, 2/e
© 2005 Pearson Prentice Hall, Inc.
(a) Xylem tissue can act asa (b) Capillarity results from three forces.
capillary tube.
ae Water molecules at the
st soe surface are pulled
Aire { down by hydrogen
CG Meniscus Surface tensio™ “=> bonds below (resulting
Water—! * i in meniscus); molecules
below are pulled up
c
2
ae
1s
<<.
Water molecules
adhere to walls of
~ tube
Water molecules
adhere to each other
Figure 36-10 Biological Science, 2/e
© 2005 Pearson Prentice Hall, Inc.
Heartwood and sapwood have
different functions.
Heartwood
provides structural
support but no
longer transports
water
Sapwood
transports water
Bark
Figure 35-28b Biological Science, 2/e
© 2005 Pearson Prentice Hall, Inc.
e ~, Menisci
(en :
ater ° oil
Low
water potential “ stoma
Pneumatophores
Section of
pneumatophore
= _Lenticel
O2
O, transported
to submerged
portions of plants
Flowers (also
fruits, seeds)
Young leaves
Lateral meristems
Translocation
Mature leaves
Vascular tissue
Roots
<
2
—
©
Uv
A.
“
S
—
-
Sinks
Figure 36-16 Biological Science, 2/e
© 2005 Pearson Prentice Hall, Inc.
Source leaves send sugar to the same side Source leaves send sugar to tissues on
of the plant. the same end of the plant.
14¢ was applied to Sink
\ = fF Source
Labeled sugars were f a Source
translocated to growing
leaves on the same side
of the plant
Figure 36-17b Biological Science, 2/e
© 2005 Pearson Prentice Hall, Inc.
