Which of the following describes the benefit of systemic pesticides?

Systemic pesticides are designed to be absorbed by plants and distributed throughout their tissues, providing protection against pests that may be present on various parts of the plant, including those that are not directly contacted with the pesticide. By entering the plant's vascular system, systemic pesticides can reach areas such as leaves, stems, and roots, ensuring a more comprehensive defense against a wide range of pests, including insects and pathogens that feed on or affect different plant parts.

This characteristic enables systemic pesticides to provide extended protection and control compared to other pesticide types, which may only affect pests that come into direct contact with the pesticide on the plant's surface. In cases where pests may be hidden or feeding internally, systemic action can significantly enhance the efficacy of pest management.

The other answer options do not accurately describe the primary benefits of systemic pesticides. For example, stating that systemic pesticides can only kill pests on the surface of the plant contradicts their mode of action. Additionally, while inert ingredients are part of many pesticides, their presence does not define the unique qualities or benefits of systemic pesticides. Lastly, the assertion that systemic pesticides are typically cheaper than other types does not reflect the performance attributes and value these products provide in pest management.