Water Nuggets Practice Exam 2025 – Complete Study Resource

The process indicated by nitrification and an increase in heterotrophic bacteria levels is best understood within the context of water quality degradation. Nitrification refers to the microbial oxidation of ammonia to nitrites and then to nitrates, which often occurs in aquatic environments where organic matter is present and decomposing.

When heterotrophic bacteria increase, it suggests that there is an elevated level of organic material, often due to pollution or nutrient overload, compelling these bacteria to thrive as they break down organic substances. This elevation can lead to a depletion of dissolved oxygen, negatively impacting the aquatic life and overall health of the water body.

Consequently, both the process of nitrification and the rise in heterotrophic bacteria levels are symptomatic of water quality issues, indicating that conditions are degrading rather than improving. In healthy aquatic systems, a balance in bacteria levels and nitrification generally contributes to nutrient cycling and maintaining water quality. The presence of both nitrification and increased heterotrophic bacteria is a warning sign of ecological imbalance and potential degradation.