Which experimental observation would be MOST difficult to reconcile with the mass flow hypothesis?
A higher concentration of sucrose in source tissues compared to sink tissues.
A positive correlation between the rate of transpiration and the rate of translocation.
Bidirectional movement of different solutes within the same sieve tube element.
The presence of a pressure gradient between source and sink tissues in the phloem.
Related Questions
    Ascent of sap in plants was demonstrated by
    Girdling experiment
Ganong’s experiment
Went experiment
Lever auxanometer
The Girdling Experiment demonstrates that the transport of organic nutrients in plants occurs through which vascular tissue?
Phloem
Xylem
Cambium
Pith
If the phloem is girdled (ringed) in a tree, which process is MOST directly affected?
Transpiration
Water uptake by roots
Photosynthesis in leaves
Translocation of sugars to the roots
    Choose the correct statements regarding the uptake of mineral nutrients and food in plants
    Even a little amount of exchange of material does takes place between xylem and phloem
    Most of the minerals enter the root through active absorption
    Due to variable relationship between source and sink direction of sap flow in phloem is
bidirectional
All of the above
In the mass flow hypothesis, what happens to the water potential in the phloem at the source?
Decreases
Increases
Remains the same
Fluctuates randomly
How translocation of organic material is explained in plants?
    By transpiration pull/cohesion adhesion theory
    Imbibition theory
Mass flow hypothesis
    Root pressure theory
Unloading of minerals in leaves is?
Apoplast and Symplast
Only Apoplast
Only Symplast
Vacuoles and Plastids
Which experimental observation would be MOST difficult to reconcile with the mass flow hypothesis?
A higher concentration of sucrose in source tissues compared to sink tissues.
A positive correlation between the rate of transpiration and the rate of translocation.
Bidirectional movement of different solutes within the same sieve tube element.
The presence of a pressure gradient between source and sink tissues in the phloem.
Loading of sucrose in sieve tube elements is
Simple diffusion
Active process
Facilitated diffusion
Osmosis
Which of the following mechanism can explain the transport of sucrose from source to sink?
    Osmotic movement of water into sugar loaded sieve tube cells which create a higher hydrostatic pressure into the source than in the sink
Tension created by differences in pressure potential between source and sink
    Active absorption of sucrose through sieve tube membrane driven by a specific pump
    Transpiration and active transport of sugar from source to sink
