The entry and exit of ions to and from the symplast requires the expenditure of

As cells in the cortex are loosely packed,what is the effect on water movement?

Active transport is affected by

Analogy type question:
$(1)$ Active transport : Energy requirement from $ATP$ :: Passive transport : ........

Why does the rate of diffusion of a substance along the concentration gradient not increase continuously,even when the concentration difference of the molecules across the membrane increases?

In which movement, transport molecules are necessary but energy is not utilized?