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.
Related Questions
How translocation of organic material is explained in plants?
    By transpiration pull/cohesion adhesion theory
    Imbibition theory
Mass flow hypothesis
    Root pressure theory
How translocation of organic material is explained in plants?
    By transpiration pull/cohesion adhesion theory
    Imbibition theory
Mass flow hypothesis
    Root pressure theory
Sugar stored in roots may be mobilised to become a source of food in the
    Winters
Early spring
Summers
Early summers
In the context of the Mass Flow Hypothesis, a 'sink' refers to a region where:
Sugars are produced
Sugars are unloaded and utilized or stored
Water is absorbed
Minerals are transported
    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
According to the mass flow hypothesis, what is the main driving force for the translocation of organic solutes in phloem?
Transpiration pull
Root pressure
Capillary action
Osmotic pressure gradient between source and sink
    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
    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
The Girdling Experiment demonstrates that the transport of organic nutrients in plants occurs through which vascular tissue?
Phloem
Xylem
Cambium
Pith
The 'Girdling Experiment' is conducted by plant physiologists to identify the tissue responsible for:
Translocation of food
Translocation of water
Transpiration
Absorption of water
