In what processes of life of plants does water participate? What is the reason for the continuity

1) In what processes of life of plants does water participate? 2) What is the reason for the continuity of the upward flow of water in plants? 3) What is the downward current in the stem?

1. Water participates in the process of photosynthesis, ensures the transport of substances through the cell and plant, cools the surface of the leaves during evaporation.

2. The upward flow ensures the transport of mineral salt solutions from the root to other plant organs through the vessels. Its continuity is ensured by root pressure and evaporation of water in the leaves.

3. The descending flow ensures the movement of solutions of organic substances from the place of photosynthesis (leaves) to the root and other organs of the plant through sieve tubes.