Transport System
(Xylem and Phloem) Lab Exercise
Name ___________
(262 Points)
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IA. Below are my and my colleagues images tracking
the transpiration of dyed water through Lycopersicum. On one of each
of these images at each position (RH, TP, EP, I, N, P, L) in the plant
I have labeled all the pertinent vasculature tissues and
I have indicated potential pathways for water and elements and
photosynthate. [7 * 6 * 6 points =
252 points total]. I have identified my images with my initials.
| TIME |
IMAGE
of Root Hair Portion of Root (RH) |
| 2
Hours |
|
| 4
Hours |
|
| 6
Hours |
|
| 16
Hours |
|
| TIME |
IMAGE
of proximal area of Tap Root (TR)
|
| 2
Hours |
|
| 4
Hours |
|
| 6
Hours |
|
| 16
Hours |
|
| TIME |
IMAGE
of mid-point of Epicotyl (EP)
|
| 2
Hours |
|
| 4
Hours |
|
| 6
Hours |
|
| 16
Hours |
|
| TIME |
IMAGE
of mid-point of 3rd youngest Internode (I)
|
| 2
Hours |
|
| 4
Hours |
|
| 6
Hours |
|
| 16
Hours |
|
| TIME |
IMAGE
of 3rd youngest Node (N)
|
| 2
Hours |
|
| 4
Hours |
|
| 6
Hours |
|
| 16
Hours |
|
| TIME |
IMAGE
of mid-point of 3rd youngest Petiole (P)
|
| 2
Hours |
|
| 4
Hours |
|
| 6
Hours |
|
| 16
Hours |
|
| TIME |
IMAGE
of mid-point of middle leaflet of 3rd youngest Leaf (L)
|
| 2
Hours |
|
| 4
Hours |
|
| 6
Hours |
|
| 16
Hours |
|
IB. From my observations on the Populus
dye
experiment I now understand that water coming from the roots and
entering a particular leaf does not directly flow through all the
secondary
xylem in the current years annual growth ring. Rather the pathway
that this water takes is best describe as ______________. I think
that the reason behind this transpiration pathway pattern relates to
_____________.
I think that photosynthate (will/will not) follow this same general
pathway
because _______. (4 Points)
IC. As water flows through
the xylem of the petiole into successively smaller veins in the leaf,
the
rate of flow __________. The driving force for transpiration flow
comes from __________. The sugar synthesized during
photosynthesis
enters the sieve tube elements through ______. The flow
rate
of photosynthate translocation _________ as it passes through the
successively
larger veins of the leaf and into the veins of the petiole.
Ultimately
the veins of the petiole allow the photosynthate to be translocated to
_________. The driving force for phloem translocation is
_________.
(6 Points)