Many plants grow in the spring and summer and become dormant during the fall and winter explain what triggers dormancy in a plant and explain the benefits of winter dormancy for those plants

What triggers it is no more sun because plants use a system called photosynthesis and they need sun to do that so when there is no sun they wount grow so going doesn’t helps them stay Alive with no sun

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.