What factors contribute to plant stress according to FNGLA?

The correct choice emphasizes the comprehensive nature of plant stress factors by including multiple critical elements that can affect plant health. Water availability is essential for plant growth; insufficient water can lead to drought stress, while excess water can cause root rot. Nutrient deficiency can weaken a plant’s structure and overall health, making it more susceptible to diseases and pests.

Pest pressure is another significant stressor, as insects and diseases can damage plant tissues, reduce photosynthesis, and impair growth. Environmental conditions such as temperature extremes, humidity levels, and light availability also play a crucial role in influencing a plant’s ability to thrive. These factors can interact in complex ways, contributing to a plant's overall stress levels.

By recognizing that all these elements—water, nutrients, pests, and environmental conditions—are integral to plant health, this option reflects a holistic understanding of what contributes to plant stress, highlighting the importance of managing all these aspects to ensure healthy plant growth.