The removal of a ring of bark from the trunk of a tree eventually kills it,since

Bidirectional elements transportation is seen in:

In vascular plants,what is the nature of the transport of organic and mineral nutrients in the phloem?

Arrange the following events of mass flow of organic material in sequence:
$I$. Sugars are transported from cell to cell in the leaf
$II$. Food is synthesized in form of glucose by leaf cells
$III$. Movement of water takes place into sieve tube elements
$IV$. Downward movement of sugar occurs in the stem
$V$. Solutes are actively transported into the sieve elements

Which structure of the phloem creates a pressure gradient in the sieve tube?

In higher plants,the translocation of food materials occurs through ..........