Which option best describes systemic chemicals?

Systemic chemicals are designed to be absorbed by plants and translocated throughout their tissues, allowing them to target pests that feed on various parts of the plant. This characteristic means that they provide a more thorough and sustained level of pest control, often resulting in fewer applications compared to contact pesticides, which only affect the parts of the plant they directly contact.

The fact that systemic chemicals penetrate the plant's system allows for effective treatment of pests that may not be accessible or visible at the time of application. This depth of penetration and translocation is essential for ensuring that the pest is controlled while minimizing the need for frequent reapplication, thus providing convenience and potentially reducing the overall amount of chemical used.

In contrast, other choices present scenarios that do not accurately describe systemic chemicals. They are not limited to granular forms; they can come in various formulations, including liquids and powders. The effectiveness of systemic chemicals is not restricted to specific conditions like dryness, as they can work in various environmental conditions after being absorbed. Lastly, their use is not confined to flowering plants; systemic chemicals can be applied to a wide range of plant types, including non-flowering varieties. This versatility highlights the broader applications and benefits of systemic chemicals in pest management.