What structure in the cell release energy from food?

The mitochondria releases energy from food

These organelles are found primarily in animal cells. Just as a power plant supplies energy to a business mitochondria release energy for the cell. The largest organelle in the cytoplasm of aeukaryoti cell is usually the nucleus a structure that directs all the activities of the cell. So the answer is mitochondria.

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.