What is a sign of poor light conditions for plants?

Pale coloration and spindly growth in plants are clear indicators of inadequate light conditions. When plants do not receive enough light, they are unable to perform photosynthesis efficiently, which results in a lack of chlorophyll. This deficiency causes leaves to appear pale or yellow rather than green. Additionally, in an effort to reach towards available light sources, plants may exhibit elongated or stretched growth, leading to a spindly appearance. This response is often referred to as etiolation, where the plant grows tall and thin in search of light.

The other options reflect healthy growth or optimal light conditions. Vibrant colors typically suggest that a plant is thriving and receiving the necessary light and nutrients. Thick foliage is also a sign of healthy growth, often found in plants that are adequately illuminated. Rapid growth usually occurs in well-lit conditions where plants can maximize photosynthesis, contributing to robust health and development. Therefore, pale coloration and spindly growth uniquely signify the stress plants experience due to poor lighting.