3 A seedling is placed, with its roots, in a solution containing potassium ions and lett for 48 hours.
The relative concentrations of the potassium ions are shown in the table
concentration of
potassium ions in
the solution
concentration of
potassium ions in
the root har
20
15
start of experiment
after 48 hours
18
35
How did the potassium ions enter the cell?
active
transport
diffusion
Osmosis
A
X
key
B
- yes
Xno
С
D
X

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high