Food is transported to various parts of the plant through

According to the pressure flow hypothesis:
$A.$ Phloem loading produces a hypertonic condition in the sieve tubes.
$B.$ Water potential gradient facilitates the mass movement in the phloem.
$C.$ Phloem unloading is a passive process.

......... and ......... may be reversed depending on the season or the plant's need.

Spanner and Jones suggested which of the following methods for translocation through phloem?

The translocation of organic solutes in sieve tubes occurs through which of the following mechanisms?

Where is the bidirectional transport of minerals observed?