Where are the control points located in the context of water transport in plants?

Water molecules are highly polar. The polar end of a molecule attracts opposite charges on another water molecule (acting like a magnet). How would you explain this property of water with reference to the upward movement of water? Comment on the upward movement of water given the intermolecular hydrogen bonding in water.

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

The continuity of the water column in the $xylem$ is maintained due to

Ascent of sap is due to which force?

Which of the following is more during the night?