Which process is primarily responsible for the loading of sucrose into sieve tube elements?
Active transport
Diffusion
Osmosis
Passive transport
Related Questions
Which tissue is responsible for the transport of sucrose from leaves to other parts of the plant?
Xylem
Phloem
Cambium
Pith
Transpiration contributes to the cooling of leaf surfaces. This cooling effect can be as much as:
2°C
10°C
20°C
30°C
Which of the following is NOT a characteristic of the apoplastic pathway?
Movement through cell walls
Movement through intercellular spaces
Unregulated movement until the Casparian strip
Movement through plasmodesmata
Which of the following manipulations would MOST directly inhibit the loading of sucrose into the sieve tube elements at the source?
Decreasing the hydrostatic pressure in the sieve tube elements
Blocking plasmodesmata between companion cells and sieve tube elements
Increasing the concentration of sucrose in the sink
Inhibition of apoplastic proton pumps in companion cells
The bulk movement of substances through the vascular tissue is called:
Diffusion
Osmosis
Translocation
Imbibition
Water moving through the apoplast encounters a barrier that forces it into the symplast. This barrier is located in which tissue layer of the root?
Epidermis
Cortex
Endodermis
Pericycle
The cohesion-tension theory explains the ascent of sap in the xylem primarily due to:
Root pressure
Capillary action
Active transport of water
The cohesive properties of water and transpiration pull
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
The movement of minerals through the apoplast is interrupted at the:
Epidermis
Cortex
Casparian strip
Phloem
Which of the following is NOT a major driving force for long-distance transport in plants?
Transpiration pull
Root pressure
Active transport
Diffusion
