| 4.) State the function of the key
labeled components
of pictured potometer and explain how it measures transpiration water loss. (10) Potometer picture from labbench.com |
 |
Transpiration/Vascular Plant Transport Review Activity/A.P. Biology
Name ____________________________
[Your Task]
1.) Examine a cross section of a leaf (preferably dicot). Carefully draw
a diagram
of this cross section using a pencil. Identify at least 5
different structures in
your drawing. (15)
2.) a.) Identify the chief function of the following leaf structures; epidermal layers,
palisade mesophyll, spongy mesophyll, stomate, and guard cell. (5)b.) How do changes in water potential involving the guard cells influence the rate of transpiration? Explain why these effects occur. (10)
3.) Please answer the following questions. Utilize complete sentences in
formulating your correct responses. (10)
a.) Besides transpiration pull, identify and briefly explain three other factors
associated with upward pull in vascular plants.b.) Explain how the polarity of the water molecule produces hydrogen bonding between water molecules.
c.) Relate the concept of water potential to the concept of transpiration pull.
| 4.) State the function of the key
labeled components
of pictured potometer and explain how it measures transpiration water loss. (10) Potometer picture from labbench.com |
|
5. Graph and discuss the physiological reasons for the differences
observed in the transpiration rate based
on the data indicated below. Your graph should have labeled
axes (time V water loss in ml) and a title. (15)
These results courtesy of Cheryl Massengale's
website
Results: Transpiration Rate
|
Condition |
Water Level in Millimeters |
|||
|
0 minutes |
10 minutes |
20 minutes |
30 minutes |
|
|
Room |
69.1 |
69.1 |
69.1 |
69.1 |
|
Fan |
73.6 |
72.8 |
72.0 |
72.0 |
|
Light |
73.0 |
72.5 |
72.2 |
71.8 |
|
Mist |
72.5 |
72.3 |
71.9 |
71.9 |
6.) Discuss several adaptations that enable plants to reduce water loss from
leaves. Include both structural and physiological adaptations. (10)
7.) What is the advantage to a plant of closed stomata when water is in short
supply? What are its disadvantages? (5)