Plant health is influenced by which of the following?

• A. Nutrient Deficiency Only
• B. Biotic Stress Factors
• C. Abiotic Stress Factors
• D. Biotic and Abiotic Stress Factors

Answer: (D)

Plant health is shaped by both biotic factors (living threats such as diseases, insect pests, and weeds) and abiotic factors (non‑living conditions like water, temperature, light, and nutrients). Biotic stresses damage plants directly through infection or feeding and can weaken them, while abiotic stresses disrupt essential physiological processes—drought reduces water supply and turgor, extreme temperatures affect enzyme activities, and nutrient imbalances limit growth. Because health results from a mix of these influences, considering only one category misses important factors that can alter a plant’s condition. The option that includes both biotic and abiotic stress factors best reflects what affects plant health in practice. The other choices are too narrow: focusing only on nutrient deficiency ignores living threats; focusing only on biotic factors misses environmental stresses; focusing only on abiotic factors misses pathogens and pests.