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TEST 2 ESSM 306

Terms in this set (41)

What are the processes responsible for the water flow through the xylem in plants?
The cohesion of water molecules and the tension due to leaf transpiration
Which of the following statements regarding the cohesive-tension theory is incorrect?
Water in the leaf does not evaporate from a film within the cell walls
In the figure below, the trends from (A) to (C) correspond to
A decrease of the radios of curvature leading to stronger (more negative) hydrostatic pressure
The force for xylem transport is generated at
The air-water interfaces within the leaf
In the xylem, the hydraulic conductance represents
How much water crosses a given section of the xylem given a certain pressure
When comparing xylem vessels, the vessels with larger diameter are expected to have
Higher hydraulic conductance
In the figure below, what do Ks and P50 represent, respectively?
Xylem hydraulic efficiency and xylem safety (embolism resistance)
In the figure below, most species (data points in the bottom left corner) share:
Low hydraulic efficiency and low safety (embolism resistance)
How is cavitation, or embolism, defined?
The formation of gas bubbles within the water column of the xylem
Which of the following phenomena DOES NOT represent a coping mechanism against embolism?
Opening of stomata to let air bubbles leave the xylem
Which of the following phenomena DOES NOT increase the chances of cavitation?
Flooding
Which of the following statement is incorrect? Long-distance transport in plants involve a mechanism akin to pumping B. Most plants have two systems for long-distance transport C. Mature xylem tissues are formed by dead cells D. Transport through the xylem does not require ATP E. Transport through the phloem requires ATP
Long-distance transport in plants involve a mechanism akin to pumping
Given the girdling experiments by Mason and Maskell, what are the correct numbers to replace A, B and C in the table below, respectively?
0, 10, 744
You supply a single leaf of a plant with 14CO2 for a day and let the phloem sap flow in that plant for another day. What do you expect to see in the autoradiograph of a whole plant taken at the end of this experiment?
Emission of radioactivity from the leaf supplied with 14CO2 and the plant sinks
In this figure, the numbers 2, 4 and 5 point to, respectively
Xylem, Casparian band, Endodermis
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