AP BIOLOGY

Detailed explanation-1: -A water drop is composed of water molecules that like to stick together-an example of the property of cohesion. In the picture of pine needles above, the water droplets are stuck to the end of the pine needles-an example of the property of adhesion.

Detailed explanation-2: -Water likes to stick to itself, but under certain circumstances, it actually prefers to stick to other types of molecules. Adhesion is the attraction of molecules of one kind for molecules of a different kind, and it can be quite strong for water, especially with other molecules bearing positive or negative charges.

Detailed explanation-3: -Two examples of adhesion are: water droplets sticking to a window after a rainfall, and dew drops hanging from the leaves of a plant.

Detailed explanation-4: -Water has cohesive and adhesive properties. Cohesive forces are responsible for surface tension, the tendency of a liquid’s surface to resist rupture when placed under tension or stress. Water also has adhesive properties that allow it to stick to substances other than itself.