Which of the following is NOT a long-distance transport pathway in plants?
Xylem
Phloem
Apoplast
Symplast
Related Questions
Which of the following is NOT a major driving force for long-distance transport in plants?
Transpiration pull
Root pressure
Active transport
Diffusion
The pressure-flow hypothesis explains the translocation of sugars in the phloem. Which of the following statements regarding this hypothesis is INCORRECT?
Active loading of sugars at the source creates a high solute concentration in the sieve tubes.
Water moves from the xylem to the phloem at the source, increasing turgor pressure.
Sugars are unloaded at the sink, lowering the solute concentration and water potential.
Water moves from the sink to the source via the phloem, driven by a pressure gradient.
The transpiration pull in plants can lift a column of water in xylem to a height of over 130 meters. This lift is primarily driven by:
Active transport of water by root cells
Capillary action in xylem vessels
Root pressure generated in the roots
Evaporation of water from leaves
A plant is exposed to a chemical that specifically inhibits the activity of aquaporins in root cells. Which of the following would be the MOST direct consequence of this inhibition?
Increased rate of transpiration
Enhanced mineral absorption
Stimulation of phloem loading
Reduced water uptake by the roots
Girdling experiments demonstrate the role of which tissue in the transport of sugars?
Phloem
Xylem
Cambium
Pith
Which tissue is responsible for the transport of sucrose from leaves to other parts of the plant?
Xylem
Phloem
Cambium
Pith
The pressure-flow hypothesis explains the movement of:
Sugars in phloem
Water in xylem
Minerals in xylem
Water in phloem
The apoplastic pathway of water transport in plants is interrupted at the endodermis by which structure?
Cell wall
Plasmodesmata
Casparian strip
Plasma membrane
Transpiration contributes to the cooling of leaf surfaces. This cooling effect can be as much as:
2°C
10°C
20°C
30°C
If transpiration in a plant is significantly reduced, which of the following is MOST likely to occur?
Increased water uptake by roots
Decreased leaf temperature
Increased transport of minerals
Increased leaf temperature
