A researcher observes that applying a metabolic inhibitor to the sink tissues of a plant reduces the rate of translocation. How does this observation relate to the mass flow hypothesis?
It refutes the hypothesis, as metabolic energy should not be required for passive flow.
It supports the hypothesis, as reduced sink activity would decrease the pressure gradient driving flow.
It is irrelevant to the hypothesis, as the inhibitor's effect is localized to the sink.
It partially supports the hypothesis, suggesting an additional active component to the predominantly passive flow.
Related Questions
Mass flow hypothesis was proposed by?
Munch
Dixon
Nitch
Levitt
    Who described mass flow hypothesis?
Munch
Sir JC Bose
Kursanov
Buchmann and Priestly
The movement of sucrose into sieve tube elements at the source is primarily achieved through:
Diffusion
Osmosis
Passive transport
Active transport
In companion cells, during translocation, organic nutrient is loaded mainly in the form of
Sucrose
Glucose
Starch
Glucose and fructose
    Ascent of sap in plants was demonstrated by
    Girdling experiment
Ganong’s experiment
Went experiment
Lever auxanometer
    Transport of organic solutes is supposed to take place by pressure flow hypothesis through phloem tissue from source to sink. Choose the false statement about vascular tissue transport
Movement of water takes place through xylem along a gradient of water potential.
Phloem transports organic solutes from source to sink.
Active transport is involved in loading and unloading of organic solutes at source and sink respectively.
Xylem and phloem are living tissues.
    When sugars enter sieve tubes, water flows by osmosis, resulting in
    Water potential
Osmotic gradient
Turgor pressure
DPD
The Girdling Experiment demonstrates that the transport of organic nutrients in plants occurs through which vascular tissue?
Phloem
Xylem
Cambium
Pith
Researchers manipulate a plant's phloem by selectively blocking plasmodesmata connecting companion cells to sieve tube elements near a leaf. Which outcome would provide the STRONGEST evidence AGAINST the mass flow hypothesis?
Accumulation of sucrose in the leaf and reduced transport to the roots.
Increased turgor pressure in the sieve tubes near the leaf.
Uninterrupted flow of sucrose from the leaf to the roots.
Decreased water potential in the sieve tubes near the leaf.
In the Girdling Experiment, removal of a ring of bark from a woody stem primarily interrupts the flow of:
Sucrose
Water and minerals
Auxins
Gibberellins
