What distinguishes diseases from disorders in plants?

The distinguishing factor between diseases and disorders in plants is that disorders arise from unfavorable growing conditions. This can include factors such as nutrient deficiencies, environmental stress, or improper care, all of which can affect a plant's growth and health without involving pathogens.

On the other hand, diseases are typically caused by pathogenic organisms such as fungi, bacteria, or viruses. These pathogens invade the plant and disrupt its normal functioning, leading to symptoms like wilting, spots, or decay. Therefore, option C correctly identifies that disorders are linked to environmental or cultural factors rather than biological pathogens, highlighting the key difference between the two concepts in plant health.