Question

directions: answers must be in essay form. outline form is not acceptable. labeled diagrams may be used to supplement discussion, but in no case will a diagram alone suffice. it is important that you read each question completely before you begin. water is important for all living organisms. the functions of water are directly related to its physical properties. 12 describe how the properties of water contribute to two of the following: - transpiration - thermoregulation in endotherms - plasma membrane structure note on your ap exam, you will handwrite your responses to free - response questions in a test booklet

Explanation:

1. Transpiration: Water's cohesion (attraction between water - water molecules) and adhesion (attraction between water and other substances like cell walls) properties are crucial. Cohesion allows water to form a continuous column in xylem vessels, and adhesion helps water stick to the walls of xylem cells. As water evaporates from leaf stomata during transpiration, the cohesive and adhesive forces pull water up from the roots.
2. Thermoregulation in endotherms: Water has a high specific heat capacity. This means it can absorb or release a large amount of heat energy without a significant change in its own temperature. In endotherms, when body temperature rises, sweating occurs. As water on the skin evaporates, it takes away heat energy due to its high heat - of - vaporization, thus cooling the body.

Answer:

For transpiration, water's cohesion and adhesion properties enable the upward movement of water from roots to leaves. For thermoregulation in endotherms, water's high specific heat capacity and heat - of - vaporization help in maintaining body temperature.