Certain halophytes can tolerate high salinity by accumulating ions like and in their vacuoles. Which membrane transport protein is MOST directly involved in this process?
Plasma membrane -ATPase
Tonoplast antiporter
Plasma membrane channel
Tonoplast aquaporin
Related Questions
Which of the following is an example of passive ion transport in plants?
Transport of nitrates into root cells using ATP
Movement of sodium ions out of guard cells
Diffusion of potassium ions into root hairs down a concentration gradient
Uptake of calcium ions into root cells against a concentration gradient
Which process facilitates the transport of ions from the soil solution into the cytoplasm of root cells against their concentration gradient?
Diffusion
Osmosis
Facilitated diffusion
Active transport using proton pumps
Root hairs are important for ion uptake primarily because they:
Store absorbed ions
Actively transport ions into the xylem
Increase the surface area for absorption
Synthesize carrier proteins for ion transport
Certain halophytes can tolerate high salinity by accumulating ions like and in their vacuoles. Which membrane transport protein is MOST directly involved in this process?
Plasma membrane -ATPase
Tonoplast antiporter
Plasma membrane channel
Tonoplast aquaporin
A researcher is studying ion uptake in plant roots using radioactive tracers. They observe that metabolic inhibitors significantly reduce the uptake of potassium ions, but not the uptake of chloride ions. What can be inferred about the uptake mechanisms of these two ions?
Potassium uptake is primarily active, while chloride uptake may be passive or facilitated.
Both potassium and chloride uptake are primarily active processes.
Both potassium and chloride uptake are primarily passive processes.
Chloride uptake is primarily active, while potassium uptake may be passive or facilitated.
What is the primary role of carrier proteins in ion uptake?
Store ions within the vacuole
Convert ions into usable forms
Facilitate the movement of ions across the cell membrane
Prevent the entry of unwanted ions
The uptake of which ion is most significantly affected by the availability of oxygen in the soil?
Potassium
Phosphate
Nitrate
Sulfate
Which of the following is NOT a mechanism involved in the uptake of mineral ions by plant roots?
Active transport
Passive transport
Facilitated diffusion
Exocytosis
The Casparian strip in the root endodermis primarily aids in:
Preventing water loss from the root
Increasing surface area for absorption
Storing excess ions
Regulating the entry of water and minerals into the xylem
Mycorrhizae enhance nutrient uptake in plants primarily by increasing:
Rate of transpiration
Root hair length
Surface area for absorption
Photosynthetic rate
