The destruction of the protoplast is a primary requirement for which of the following important functions?

Which of the following are objections to the root pressure theory of ascent of sap in plants?
$I$. It is not applicable to plants taller than $20 \ m$.
$II$. Ascent of sap occurs even in the absence of a root system.
$III$. Root pressure is almost zero in tall gymnosperms.
$IV$. Root pressure is the only mechanism explaining the ascent of sap.
$V$. Root pressure is not developed in actively transpiring plants.

According to one vital force theory,the ascent of sap is due to the active pulsation of the innermost layer of the cortex. This theory was proposed by:

The most widely accepted explanation for the ascent of sap in trees is:

Which is the most widely accepted theory for the ascent of sap in trees?

The best vital force theory was proposed by