Healthy plants are less likely to suffer from pest problems because they tend to have:

Healthy plants are indeed less susceptible to pest problems primarily because they exhibit higher resistance to environmental stress. When plants are well-nourished, properly watered, and free from diseases, they can better withstand various stressors, including those imposed by pests. This increased resilience allows them to activate their defense mechanisms more effectively, deterring pest infestations and minimizing damage.

Additionally, healthy plants can often utilize their resources more efficiently, producing secondary metabolites that may serve as natural pest repellents or toxins to deter herbivores. This factor plays a crucial role in maintaining a balanced ecosystem where healthy plants thrive and are able to fend off potential pest threats.

In contrast, lower nutrient levels could weaken a plant's physiological functions, complex root systems may not directly relate to pest resistance, and higher exposure to pests would typically lead to increased pest problems rather than reduced vulnerability. All these aspects underscore the significance of plant health in managing pest issues.