Distinguish between channel proteins and carrier proteins

A channel protein is a special arrangement of amino acids which embeds in the cell membrane, providing a hydrophilic passageway for water and small, polar ions. Like all transport proteins, each channel protein has a size and shape which excludes all but the most specific molecules.

Carrier proteins are proteins that carry substances from one side of a biological membrane to the other. ... However, carrier proteins can also be used for facilitated diffusion, a form of passive transport. Carrier proteins typically have a “binding site” which will only bind to the substance they're supposed to carry.

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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.