What is the biotic breakdown of pesticides?

The biotic breakdown of pesticides refers to the decomposition or degradation of these substances through biological processes, primarily involving living organisms such as microorganisms. This correct choice highlights the role of these organisms in breaking down chemical compounds, making pesticides less hazardous to the environment. Microorganisms such as bacteria and fungi are essential in this process as they utilize pesticides as a food source, thus transforming them into less toxic forms that can be assimilated into the ecosystem or broken down further.

The other options do not accurately describe biotic breakdown. The first option implies a chemical process that occurs independently of living organisms, which contradicts the definition of biotic breakdown that specifically involves biological activities. The third option describes a method of applying pesticides, not their breakdown, and the fourth option refers to the storage of pesticides, which is unrelated to their degradation processes. Understanding the role of microorganisms in the biotic breakdown of pesticides is key to comprehending how these substances can be managed in an environmentally friendly way.