What are the two kinds of interactions of water molecules that allow water to travel upward in plants? What other physical process aids in water transport to tops of trees?

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Solution

The two interactions between by water molecules that help them to travel upward in the plants are adhesion and cohesion.
Adhesion is the attraction between the water molecules and the xylem vessels which help them keep a good contact with xylem vessels whereas, Cohesion is the attraction between two water molecules that keeps the flow continuous and prevents breaks.
Other physical processes that help are :
1. Transpiration pull
2. Root pressure
3. Capillary action.

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