The given figure represents the structure of which cell organelle?

In a root cell,the plasma membrane is . . . . . . .

The plasma membrane helps in:

What are porins?

$Na^+/K^+$ dependent $ATPase$ activity helps in the transport of:

How do neutral solutes move across the plasma membrane? Can the polar molecules also move across it in the same way? If not,then how are these transported across the membrane?