Definition: The Greek term 'aphydrotropism' describes a plant that grows towards the sun, often in areas with poor or no sunlight availability, such as arid desert environments. In this sense, 'aphydrotropism' is described as an adaptation to survive and thrive in extreme conditions, where sunlight is scarce but water is abundant. This practice allows plants like cacti to regulate their photosynthesis by moving towards the sun while still producing a large amount of oxygen in the process.