Water Nuggets Practice Exam 2025 – Complete Study Resource

pH levels play a crucial role in the health and survival of aquatic organisms. Aquatic life, including fish and invertebrates, is sensitive to changes in pH, and extreme levels—whether too acidic or too alkaline—can lead to harmful conditions.

When the pH of water falls outside the optimal range for a species, it can affect physiological processes such as respiration, osmoregulation, and reproduction. For example, highly acidic waters (low pH) can lead to metal leaching from sediments, which can be toxic to aquatic organisms. Conversely, high pH levels can lead to ammonia toxicity and cause harm to gill function in fish.

Thus, maintaining the pH within a suitable range is essential for the health of aquatic ecosystems. The statement that extreme pH levels can be toxic to organisms accurately reflects the scientific consensus on the importance of pH in aquatic environments. This understanding is key to protecting water quality and preserving aquatic biodiversity.