Which of the following statements is correct regarding the transport of substances in plants?

Bidirectional elements transportation is seen in:

In which form is the food transported in plants?

Consider the following statements and choose the correct option from the codes given below:
$I.$ Loading of phloem is related to the increase of sugar in phloem.
$II.$ Active loading of sugar in the sieve tube of phloem is driven by a proton pump.
$III.$ Pressure may be positive or negative in sieve tube cells.
$IV.$ Water and solutes move through the sieve tube against the pressure gradient.
$V.$ Cytoplasmic strands pass through the holes in sieve plates and form continuous filaments.

The concentration of xylem sap is:

What is the transport pathway in rooted plants for organic nutrients?