Living Environment Regents Practice Test

Photosynthesis is the process identified as not being regulated by hormones because it primarily involves biochemical reactions controlled by environmental factors such as light, carbon dioxide, and water. This process occurs in plants, where chlorophyll captures sunlight to convert carbon dioxide and water into glucose and oxygen, relying largely on physical conditions and the availability of resources rather than hormonal signals.

In contrast, growth, metabolism, and stress response are all heavily influenced by hormones. Growth is regulated by hormones like auxins and gibberellins in plants, and growth hormones such as HGH (human growth hormone) in animals, which stimulate cell division and development. Metabolism is influenced by hormones like insulin and glucagon, which help control glucose levels in the blood, and thyroid hormones that regulate metabolic rate. The stress response involves hormones such as adrenaline and cortisol, which prepare the body to respond to stressors. Each of these processes relies on complex hormonal signaling pathways to maintain homeostasis and regulate physiological functions effectively.