16 Questions
What is the main reason for water uptake by a cut shoot in a potometer?
Transpiration
Why are potometers notoriously difficult to set up?
Air bubbles can disrupt their functioning
How can the effect of wind, heat, and humidity on transpiration be measured using a potometer?
By altering the surrounding atmospheric conditions
What does measuring how far a bubble moves in a given period of time help determine in a potometer?
Transpiration rate
In a potometer setup, why is it important to measure the surface area of both sides of the leaves?
To compare transpiration rates between plant species
What could be a useful unit for comparing transpiration rates in different plant species through a potometer?
Water loss (ml)/cm2/minute
What is the main factor influencing water potential in plant solutions?
Solute concentration
How is water potential denoted in plant physiology?
ψ (Psi)
What is the unit of measurement used to express water potential?
Megapascals
In terms of water potential, what value is designated to pure water for convenience of definition?
0 MPa
What allows plants to move water to great heights?
Transpiration pull
What effect would a decrease in solute concentration have on the water potential of a plant cell?
Increase the water potential
Which component of water potential is responsible for reducing available potential energy when solutes are added to an aqueous system?
Solute potential
In the context of water movement in plants, why is solute potential referred to as osmotic potential?
Relating to the movement of water across a membrane
Which of the following statements is true regarding the direction of water movement based on water potentials in plant systems?
Water moves towards an area with higher solute potential
What happens to the total water potential when Ψs decreases?
Total water potential decreases
Learn about potometers, devices used to measure the rate of water uptake in leafy plant shoots. Understand how transpiration affects water uptake and how surrounding atmospheric conditions can influence the process. Explore the challenges of setting up a potometer due to air bubbles in the xylem or apparatus.
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