An abnormal condition caused by something interfering with a plant's normal life functions; may be biotic or abiotic.

An abnormal condition caused by something interfering with a plant's normal life functions; may be biotic or abiotic.

• A. Disease
• B. Disease Cycle
• C. Desiccation
• D. Excrement

Answer: (A)

This item asks you to recognize the term for an abnormal condition in a plant caused by something that disrupts normal life functions. That broad idea is exactly what a disease is: a condition in which the plant’s normal processes are interfered with, and the cause can be living (biotic, like a pathogen) or nonliving (abiotic, like drought, nutrient deficiency, or chemical injury). Why this is the best choice: disease captures both biotic and abiotic causes that disrupt a plant’s function, leading to symptoms and impairment. The other options describe something more specific or unrelated: a disease cycle is the sequence of steps a pathogen takes to spread, not the abnormal condition itself; desiccation refers to drying out (a specific abiotic stress), not the general disease concept; excrement is not related to plant health in this context.

This item asks you to recognize the term for an abnormal condition in a plant caused by something that disrupts normal life functions. That broad idea is exactly what a disease is: a condition in which the plant’s normal processes are interfered with, and the cause can be living (biotic, like a pathogen) or nonliving (abiotic, like drought, nutrient deficiency, or chemical injury).

Why this is the best choice: disease captures both biotic and abiotic causes that disrupt a plant’s function, leading to symptoms and impairment. The other options describe something more specific or unrelated: a disease cycle is the sequence of steps a pathogen takes to spread, not the abnormal condition itself; desiccation refers to drying out (a specific abiotic stress), not the general disease concept; excrement is not related to plant health in this context.