Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
Which statement BEST differentiates amitosis from other forms of nuclear division like mitosis and meiosis?
Amitosis involves DNA replication, while mitosis and meiosis do not.
Amitosis produces genetically identical daughter cells, while mitosis and meiosis produce genetically diverse cells.
Amitosis occurs in somatic cells, while mitosis and meiosis occur in germ cells.
Amitosis lacks chromosome condensation and spindle formation, unlike mitosis and meiosis.
A researcher is studying mitosis in a novel diploid organism with 2n = 16 chromosomes. During metaphase, a drug is applied that inhibits the separation of sister chromatids but allows the cell to progress through anaphase and telophase. At the end of this aberrant cell division, what is the most likely chromosomal composition of the resulting daughter cells?
Two diploid cells (2n=16) each
One diploid cell (2n=16) and one cell with no chromosomes
One tetraploid cell (4n=32)
Two cells with 8 chromosomes each
In an experiment, cells are arrested in metaphase using colchicine, a drug that inhibits microtubule polymerization. If these cells are then fused with cells in G1 phase, what is the most likely outcome for the G1 chromosomes?
The G1 chromosomes will replicate their DNA.
The G1 chromosomes will condense prematurely.
The G1 chromosomes will remain unaffected.
The G1 chromosomes will fragment.
A cell in G1 phase has 2C DNA content. If this cell undergoes endoreduplication twice followed by standard mitosis, what will be the DNA content of the resulting daughter cells?
2C
4C
8C
16C
A researcher studying secondary growth in a dicot stem observes a peculiar pattern. The vascular cambium appears to be producing more xylem towards the center than phloem towards the periphery. Which of the following factors is LEAST likely to contribute to this unusual observation?
Hormonal imbalances
Environmental stress
Genetic mutation
Seasonal variations
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.
