While a small amount of algae in a system or area could be beneficial, an overgrowth of algae could cause low DO levels.

While a small amount of algae in a system or area could be beneficial, an overgrowth of algae could cause low DO levels.

• A. True
• B. False

Answer: (A)

An overgrowth of algae in an aquatic system can indeed lead to low dissolved oxygen (DO) levels, making the statement true. When algae thrive, especially during a bloom, they can account for a significant increase in biomass. At night or during periods of decomposition, this biomass can consume a large amount of oxygen as it breaks down, leading to a decrease in the available DO for other organisms in the system. Additionally, a high concentration of algae can block sunlight, reducing photosynthetic activity from aquatic plants and further contributing to lower oxygen production. This creates a situation where fish and other aquatic life can suffer from hypoxia, which is a deficiency in oxygen. Therefore, while some algae are beneficial for nutrient cycling and as a food source, excessive growth inhibits the overall health of the aquatic environment, confirming that low DO levels are a consequence of overgrown algae.

An overgrowth of algae in an aquatic system can indeed lead to low dissolved oxygen (DO) levels, making the statement true. When algae thrive, especially during a bloom, they can account for a significant increase in biomass. At night or during periods of decomposition, this biomass can consume a large amount of oxygen as it breaks down, leading to a decrease in the available DO for other organisms in the system.

Additionally, a high concentration of algae can block sunlight, reducing photosynthetic activity from aquatic plants and further contributing to lower oxygen production. This creates a situation where fish and other aquatic life can suffer from hypoxia, which is a deficiency in oxygen. Therefore, while some algae are beneficial for nutrient cycling and as a food source, excessive growth inhibits the overall health of the aquatic environment, confirming that low DO levels are a consequence of overgrown algae.