Na+/K+ pump is associated with
passive transport
active transport
osmosis
imbibition
B.
active transport
Sodium-potassium pump (Na-K) is a membrane transport protein that exchanges sodium ions (Na+) for potassium ions (K+). It transports 3 Na+ outwards for 2K+ into the cell, thus maintaining the differential concentrations of each ion across the plasma membrane. The process requires energy in the form of ATP, being a form of active transport.
Which one of the following is correct for the transmembrane proteins in lipid bilayer of plasma membrane?
They are absent in animal cells
They act as channel proteins
They are absent in plant cells
They are only externally located
Which one of the following does'nt help in molecule transport?
Diffusion
Osmosis
Surface tension
Active transport
What is correct about the movement of substance across the membrane in facilitated diffusion?
It is an active transport
It doesn't cause transport of molecules from low concentration to high concentration
It is insensitive to inhibitors
It is a very specific transport
A plasmolysed cell can be deplasmolysed by placing it in
isotonic solution
saturated solution
pure water or hypotonic solution
hypertonic solution
Potometer works on the principle of
amount of water absorbed equals the maount transpired
osmotic pressure
root pressure
potential difference between the tip of the tube and that of the plant
Assertion: Translocation of sugar from source (leaf) to sink is defined as pressure flow hypothesis.
Reason: Translocation of the solute is facilitated through living phloem sieve tube cells.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
The real forces responsible for the movement of water from one cell to another cell is mainly
Osmotic Pressure (OP)
Turgor Pressure (TP)
Diffusion Pressure Deficit (DPD)
imbibition
