Cohesion is the mixing of similar molecules; the cohesion of water is when water molecules are connected to water molecules. Water is strongly cohesive. The reason why a water drop looks like its shape is because of the cohesion attraction of all the water molecules which together makes on big shape. Cohesion of water allows water to be transported into plants; since cohesion is the connection of water molecules this allows water to move up from the stem to the leaves. Water molecules when in cohesion attraction performs a huge step in creating water’s surface tension, this allows insects to walk on top of water.