Which of the following is a way that groundwater depletion affects streams?

• A. It increases the rate of photosynthesis in aquatic plants.
• B. It reduces stream flow during dry periods.
• C. It leads to an increase in fish population.
• D. It causes streams to become more acidic.

Answer: (B)

Verified step by step guidance

1. Understand the concept of groundwater depletion: Groundwater depletion occurs when water is withdrawn from aquifers faster than it can be replenished. This can lead to a reduction in the water table and affect nearby ecosystems, including streams.
2. Recognize the relationship between groundwater and streams: Streams often rely on groundwater to maintain their flow, especially during dry periods when surface water sources are limited. Groundwater contributes to the base flow of streams.
3. Analyze the impact of reduced groundwater on stream flow: When groundwater is depleted, less water is available to feed streams, leading to reduced stream flow during dry periods. This can affect aquatic ecosystems and organisms that depend on consistent water levels.
4. Evaluate the incorrect options: Increased photosynthesis in aquatic plants, an increase in fish population, or streams becoming more acidic are not direct consequences of groundwater depletion. These effects are influenced by other environmental factors, not groundwater levels.
5. Conclude that the correct answer is: Groundwater depletion reduces stream flow during dry periods, as streams lose their primary source of water input from the aquifers.