Prepare for NEET Biology Mineral Nutrition with MCQs & PYQs on NEET.GUIDE. Enjoy free practice, previous year questions, and expert solutions to understand nutrient uptake and deficiency.
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.
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
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.
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.
A mutation in a legume plant prevents the formation of infection threads during rhizobial symbiosis. Which of the following processes would be MOST directly affected?
Recognition of the rhizobia by the root hairs
Curling of root hairs
Formation of the nodule meristem
Release of bacteria into the host cell cytoplasm
A researcher observes that a particular legume mutant forms nodules, but these nodules fail to fix nitrogen. Which of the following gene mutations is MOST likely responsible?
Mutation in nod genes
Mutation in genes encoding flavonoid biosynthesis
Mutation in nif genes
Mutation in genes encoding leghemoglobin
Which of the following is NOT a direct consequence of Nod factor signaling in the host plant during root nodule formation?
Root hair curling
Formation of infection threads
Cortical cell division leading to nodule primordia formation
Expression of nif genes in bacteroids
Deficiency of which of the given sets of elements causes necrosis?
N, S and Fe
N, S and Mo
Ca, Mg, Cu and K
Zn, Mo, Fe, S
Which of the given prokaryotes fixes nitrogen symbiotically as well as in free living state?
Rhizobium
Thiobacillus
Anabaena
Azotobacter
