Comparing Hypotheses on Algal Growth

Very Hard Conflicting Viewpoints Comparing Hypotheses

In an ecological study, two competing hypotheses regarding the impact of nutrient levels on algal growth in freshwater lakes were developed. Hypothesis A suggests that higher phosphorus concentrations in the water lead to increased algal bloom densities, primarily due to enhanced growth rates. In contrast, Hypothesis B claims that algal growth is more significantly influenced by nitrogen levels, positing that while phosphorus is a contributor, nitrogen availability directly governs the algal bloom's biomass during the summer months.

Researchers conducted experiments across multiple freshwater lakes with varying nutrient concentrations. They monitored algal bloom densities and nutrient levels over a span of six months. The findings indicated a consistent pattern of increased algal growth correlated with phosphorus, but in lakes with high nitrogen availability, algal blooms showed prolonged persistence against declines in phosphorus.

Based on these findings, which of the following statements most accurately compares the predictions of Hypothesis A and Hypothesis B regarding the relationship between nutrient concentrations and algal growth?

Hypothesis A predicts that algal growth will only occur when phosphorus levels are elevated, while Hypothesis B suggests that algal growth can also thrive with sufficient nitrogen.

Hypothesis A and Hypothesis B both indicate that increased phosphorus concentrations are necessary for any significant algal growth.

According to Hypothesis B, algal blooms will diminish regardless of phosphorus levels if nitrogen is scarce, supporting the notion of nitrogen's crucial role.

Hypothesis A states phosphorus is the sole factor for algal growth, while Hypothesis B acknowledges that phosphorus aids but is not essential when nitrogen is sufficient.

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