Which of the following is true about inorganic pesticides?

Inorganic pesticides are those that are primarily derived from mineral compounds rather than organic materials or biological sources. This means they are typically created from naturally occurring minerals or elements found in the earth, such as sulfur, copper, and arsenic. Their mineral origin is significant because it often influences their behavior in the environment, their mode of action, and their overall effectiveness against pests.

The other options refer to origins that are not applicable to inorganic pesticides. For instance, the first two options imply that the pesticides are derived from biological or natural plant extracts, which categorizes them as organic pesticides instead. The last option suggests that these pesticides contribute to photosynthesis, which is not a characteristic of inorganic pesticides, as their primary role is pest control rather than promoting plant growth or photosynthesis. Thus, the recognition that inorganic pesticides come from mineral sources is essential in understanding their classification and application in pest management.