University of Central Florida (UCF) BSC2010C Biology I Practice Exam 4

Water is crucial for maintaining cell turgor and homeostasis because it plays a significant role in the structural integrity of plant cells. Turgor pressure results from the osmotic movement of water into the central vacuole of plant cells, exerting pressure against the cell wall. This pressure helps to keep the cell rigid and supports the overall structure of the plant.

In addition to providing structural support, water is vital for the biochemical processes within cells, such as nutrient transport and metabolic reactions. Homeostasis refers to the balance of various physiological processes, including temperature regulation and pH balance, and water is a key component in achieving and maintaining balance within the internal environment of the cell.

While proteins, the nucleus, and chloroplasts are all important for specific cellular functions—such as enzyme activity, genetic information management, and photosynthesis—none of these components directly manage turgor pressure in the same way that water does. The presence of water is essential for the proper functioning of these organelles and overall cell health, making it the critical factor in maintaining both turgor and homeostasis.