Name ___________
(74 Points)
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IA. Below are my labeled images tracking
the transpiration of dyed water through __________. On the same images
I have indicated potential pathways for photosynthate. (1 Point)
| TIME | IMAGE |
| 12 Hours | (6 Points) (6 Points) |
| 24 Hours | (6 Points) (6 Points) |
| 48 Hours | (6 Points) (6 Points) |
IB. From my study of the Pelargonium
stems have determined that secondary xylem differentiation begins around
the______ plastochron and secondary phloem differentiation begins around
the ________ plastochron of stem development. Below are my best images
illustrating these major events in secondary growth. (2 Points)
| Timing of the major events in secondary growth | Image |
| Secondary Xylem Differentiation occurred in ______ internode | (6 Points) |
| Secondary Phloem Differentiation occurred on ______ internode | (6 Points) |
IC. 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)
ID. Below are my best images of a
cleared leaf and petiole section from ________. 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 _________.
(7 Points)
| Cleared Leaf | (6 Points) |
| Petiole Section | (6 Points) |