Question

1. list 5 ways that water helps to maintain homeostasis.
2. what property of water causes surface tension? cohesion
3. give an example that you observed of surface tension (think penny lab).
4. define cohesion in your own words. give an example.
5. define adhesion in your own words. give an example.

Explanation:

1. Water helps maintain homeostasis by regulating body temperature (through sweating and evaporation), transporting nutrients and waste (in blood and other body - fluids), lubricating joints (reducing friction), participating in chemical reactions (as a solvent), and maintaining cell turgor (keeping cells hydrated).
2. In the penny lab, you can observe surface tension when you slowly add water to the surface of a penny and the water forms a dome - like shape on top of the penny instead of spilling over immediately.
3. Cohesion is the attraction between molecules of the same substance. An example is water droplets forming on a leaf; the water molecules stick together due to cohesion.
4. Adhesion is the attraction between molecules of different substances. An example is water sticking to the sides of a glass; the water molecules are attracted to the glass molecules.

Answer:

1. Regulating body temperature, transporting nutrients and waste, lubricating joints, participating in chemical reactions, maintaining cell turgor.
2. Water forming a dome on a penny.
3. Attraction between same - substance molecules. Water droplets on a leaf.
4. Attraction between different - substance molecules. Water sticking to a glass.