What would be a sign of chlorosis in a plant?

Chlorosis is a condition characterized by the yellowing of plant leaves, often due to a lack of chlorophyll. This is typically a response to various stress factors, including nutrient deficiencies (particularly nitrogen, iron, or magnesium), water issues, or environmental stresses. When a plant exhibits yellowing leaves, it signifies that the chlorophyll production is impaired, which directly affects the plant's ability to photosynthesize and can lead to stunted growth and other health issues. Healthy green foliage is indicative of a plant in good health, while rapid wilting suggests dehydration or disease but does not specifically point to chlorosis. Therefore, the presence of yellowing leaves is the definitive sign of chlorosis in a plant.