Which of the following statements is true regarding non-perennial streams during dry seasons?

The statement that non-perennial streams may become completely dry during dry seasons is indeed true. Non-perennial streams are characterized by intermittent flow, meaning they do not have a consistent, year-round water supply. During periods of low precipitation or high evaporation, these streams can dry up entirely, resulting in sections of the bed becoming exposed. This phenomenon is especially common in arid or semi-arid regions, where dry seasons can lead to significant reductions in water levels or complete cessation of flow.

In contrast, the other statements do not accurately reflect the nature of non-perennial streams during dry periods. While some non-perennial streams may support aquatic life when water is present, they do not maintain a robust ecosystem during dry times. Increased flow rates would not typically occur in non-perennial streams during dry seasons; instead, flow rates would decrease or cease altogether. Finally, non-perennial streams do not supply the same amount of water during dry seasons as they would during wetter periods, since the lack of rainfall leads to reduced or nonexistent flow.