The initial step in the uptake of mineral ions by root cells involves:
Active transport into the symplast
Passive absorption into the apoplast
Translocation through the phloem
Transport into the xylem
Related Questions
Plant obtain carbon and most of their oxygen from
Soil
Water
from the atmosphere
Symbiotic organisation
Which of the following processes requires energy to transport ions from a region of lower concentration to a region of higher concentration across a membrane?
Simple diffusion
Facilitated diffusion
Osmosis
Active transport
Which element is essential for the synthesis of chlorophyll and is often taken up as a divalent cation?
Calcium
Potassium
Magnesium
Iron
The uptake of potassium (K+) by plant roots can be described by the Michaelis-Menten kinetics. If the maximum uptake rate (Vmax) for K+ is reached at a relatively low external K+ concentration, what can be inferred about the affinity of the K+ transporter?
The K+ transporter has a low affinity for K+.
The K+ transporter is non-specific for K+.
The K+ transporter is inhibited by high K+ concentrations.
The K+ transporter has a high affinity for K+.
Which of the following is a micronutrient required for nitrogen fixation in legumes?
Magnesium
Calcium
Molybdenum
Potassium
Certain plant species can thrive in soils with high concentrations of heavy metals like nickel. These plants often exhibit modified transport proteins. How might these modified proteins contribute to heavy metal tolerance?
By increasing the influx of nickel into the cytoplasm
By facilitating the efflux of essential nutrients to compensate for nickel toxicity
By converting nickel into less toxic forms
By sequestering nickel into vacuoles, reducing its cytoplasmic concentration
Which of the following is NOT a mechanism by which mycorrhizae enhance mineral uptake in plants?
Increasing the surface area for absorption
Producing chelating agents that solubilize minerals
Directly converting atmospheric nitrogen into usable forms for the plant
Improving the plant's access to phosphorus
Iron deficiency in plants often leads to interveinal chlorosis. This is primarily due to the role of iron in:
Cell wall formation
Stomatal regulation
Synthesis of chlorophyll
Potassium uptake
Unlike facilitated diffusion, active transport:
Does not require energy
Occurs down a concentration gradient
Uses protein channels
Requires energy
A researcher is studying the uptake of iron (Fe) by plant roots. They observe that the process is significantly inhibited by the presence of respiratory inhibitors. Which of the following best explains this observation?
Iron uptake is a passive process driven by diffusion.
Iron uptake is facilitated by anaerobic respiration.
Iron uptake is coupled with the release of oxygen.
Iron uptake is an active process requiring energy from respiration.
