What is the difference between systemic and contact pesticides?

The correct choice highlights a fundamental difference between systemic and contact pesticides. Systemic pesticides are designed to be absorbed by plants, meaning that once applied, they move through the plant's system and can affect pests that feed on those plants. This internal application is particularly effective against pests that may be hidden, such as those that burrow into plant tissues. In contrast, contact pesticides do not enter the plant; they work by physically coming into contact with pests, leading to their immediate elimination upon application.

Choosing this option accurately reflects the operational mechanisms of these two types of pesticides, emphasizing the importance of understanding how a pesticide interacts with both the target plant and the pests. This is crucial for effective pest management strategies, as selecting the appropriate pesticide type can significantly influence the success of pest control efforts.