Which of the following is a common sign of nutrient deficiency in plants?

Chlorosis, or the yellowing of leaves, is a common sign of nutrient deficiency in plants, particularly indicative of a lack of essential nutrients like nitrogen, iron, or magnesium. When a plant does not receive adequate nutrients, chlorophyll production decreases, leading to the yellowing of leaves while typically the veins may remain green. This loss of green pigment affects the plant's ability to photosynthesize efficiently, which can hinder its overall health and growth.

In contrast, bright green leaves typically indicate that a plant is healthy and has access to sufficient nutrients. Wilting flowers can be associated with water stress rather than nutrient deficiencies, and rapid growth usually signifies that the plant is receiving adequate nutrients and environmental conditions. These conditions contribute to a plant's vitality, making chlorosis a pivotal indicator of nutrient issues to address for proper plant care.