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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.

Choose the correct pair regarding the physical properties of water in plants.

Explain the horizontal cut experiment to demonstrate root pressure.

Explain the cohesion-tension-transpiration pull model of water transport.

Ascent of sap is due to which force?