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
The macronutrient which is an essential component of all organic compounds, yet not obtained by plants from soil is
Nitrogen
Carbon
Phosphorus
Magnesium
A plant exposed to high levels of aluminum in the soil exhibits stunted root growth. Which of the following mechanisms is the MOST likely cause of this effect?
Aluminum directly inhibits photosynthesis, reducing energy available for root growth.
Aluminum competes with potassium for uptake, leading to potassium deficiency in roots.
Aluminum interferes with the function of calcium channels and disrupts cell wall formation.
Aluminum stimulates excessive ethylene production, inhibiting root elongation.
Which of the following statements are correct about mineral absorption in plants?
In the initial phase, ions are taken up into the outer space of cells, the apoplast. It is a passive process
In the final phase, ions are taken slowly into the inner space, the symplast of cells and it is an active process
Passive movement of the ions into the apoplast occurs through ion channels, transmembrane proteins, which acts as selective pores
All of the above
Iron deficiency in plants often leads to interveinal chlorosis. Considering the role of iron in electron transport and chlorophyll synthesis, which statement BEST explains this observation?
Iron is a key component of the electron transport chain, and its deficiency disrupts energy production needed for chlorophyll synthesis in the interveinal areas.
Iron is essential for chlorophyll synthesis, and its deficiency leads to reduced chlorophyll production, primarily in the interveinal areas.
Iron deficiency primarily affects the vascular tissue of the leaves, leading to reduced chlorophyll transport to the interveinal areas.
Iron deficiency enhances chlorophyll degradation in the interveinal areas, leading to chlorosis.
Which of the following are reservoirs for phosphorus and nitrogen cycle respectively?
Atmosphere and bedrocks
Bedrocks and atmosphere
Consumers
Atmosphere and producers
The major characteristics of colloids is/are
Homogeneous nature, particle size less than 1nm, transparent, and settling nature
Heterogeneous nature, particle size range of 1nm-1000nm, Tyndall effect, and non-settling nature
Homogeneous nature, particle size greater than 1000nm, opaque, and settling nature
Heterogeneous nature, variable particle size, no Tyndall effect, and settling nature
Which of the following combinations correctly matches the ion, its role in plants, and a typical mechanism of its uptake?
(A) Calcium - Cell wall component - Symport with protons
(B) Potassium - Stomatal regulation - Channel proteins
(C) Nitrate - Nucleic acid synthesis - Active transport through ATPases
(D) Magnesium - Chlorophyll constituent - Passive diffusion
A
B
C
D
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.
The term ‘outer space’ represents …A…, while ‘inner space’ represents …B… with reference to absorption of minerals
Identify A and B to complete the given statement
A: Soil solution; B: Inside root cells
A: Inside root cells; B: Soil solution
A: Xylem; B: Phloem
A: Cell wall; B: Cytoplasm
