Which condition is least likely to cause environmental stress to plants?

Average nutrient levels are considered the condition least likely to cause environmental stress to plants because they indicate a balanced and sufficient availability of nutrients essential for growth. Plants thrive when nutrients are present in adequate amounts, supporting their metabolic processes.

In contrast, extreme levels of light can lead to photoinhibition or sunburn on leaves, which can affect photosynthesis and overall plant health. Temperature fluctuations can create stress by causing plants to expend energy to acclimatize, impacting their growth and development. Air pollutants, such as ozone and sulfur dioxide, can also adversely affect plant physiology, leading to reduced photosynthetic capacity and even visible injury. Thus, average nutrient levels provide a nurturing environment, while the other conditions can easily disrupt plant health and well-being.