Which of the following is NOT a crucial factor for the Mass Flow Hypothesis?
Hydrostatic pressure gradient
Active loading of sugars at the source
Presence of chlorophyll
Active unloading of sugars at the sink
Related Questions
In the mass flow hypothesis, what happens to the water potential in the phloem at the source?
Decreases
Increases
Remains the same
Fluctuates randomly
    Choose the false statement
    If bark of tree is girdled from main stem, the plant dies because ascent of sap is stopped
    If xylem is girdled from main stem, wilting of leaves tales place
In the flowerering plant food is transported in the form of dissacharide sucrose
    In Girdling experiment, in a plant, root dies first
    During flowering, fruit ripening and development period in plants, which part of the plant act as source?
    Whole plant
    Stem and leaves and the plant
    Photosynthesising leaves and older leaves
    Growing parts of the plants
Which of the following is NOT a requirement for the mass flow hypothesis to function?
Presence of living phloem cells
A pressure gradient between source and sink
Active transport of sugars into phloem at the source
Active transport of water into phloem at the sink
    The transport of organic and inorganic substances in plants over longer distance occurs through vascular tissue by the means of
    Diffusion
Facilitated diffusion
    Active transport
    Mass flow
    Ascent of sap in plants was demonstrated by
    Girdling experiment
Ganong’s experiment
Went experiment
Lever auxanometer
Which of the following is NOT a crucial factor for the Mass Flow Hypothesis?
Hydrostatic pressure gradient
Active loading of sugars at the source
Presence of chlorophyll
Active unloading of sugars at the sink
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.
    Arrange the following events of mass flow of organic material in sequence
I.    Sugars are transported from cell to cell in the leaf
II.    Food is synthesised in form of glucose by leaf cells
III.    Movement of water takes place into sieve tube elements
IV.    Downward movement of sugar occurs in the stem
V.    Solutes are actively transported into the sieve elements
I, II, III, V, IV
II, I, V, III, IV
II, III, I, V, IV
I, II, V, IV, III
Imagine a hypothetical plant where sucrose transporters in companion cells are genetically modified to actively transport sucrose out of sieve tubes near the source. Assuming all other aspects of phloem structure and function remain the same, what would be the MOST likely effect on translocation according to the mass flow hypothesis?
Translocation would proceed normally, as the pressure gradient is independent of companion cell activity.
Translocation would be enhanced, as sucrose would be actively removed from the sieve tubes, creating a stronger sink.
Translocation would be significantly reduced or stopped, as the pressure gradient would be reversed or eliminated.
The direction of translocation would be reversed, with flow occurring from sink to source.
