Given below are two statements:

Statement I: Rivers and lakes that have low biological productivity are said to be eutrophic

Statement II: Rivers and lakes that are rich in organisms and organic materials are called as oligotrophic

In light of the above statements, choose the most appropriate answer from the options given below:

The correct option is: Both Statement I and Statement II are incorrect.

To understand why both statements are incorrect, let us analyze the scientific definitions of eutrophic and oligotrophic water bodies:

1. Analysis of Statement I:
Eutrophic rivers and lakes are characterized by high biological productivity. They contain a high concentration of nutrients (such as phosphorus and nitrogen) that support a dense population of algae, aquatic plants, and other organisms. Because Statement I asserts that water bodies with low biological productivity are eutrophic, Statement I is incorrect.

2. Analysis of Statement II:
Oligotrophic rivers and lakes are characterized by low biological productivity. These water bodies are nutrient-poor, meaning they support very little algae, organic material, or aquatic life, which typically makes the water clear and well-oxygenated. Because Statement II asserts that water bodies rich in organisms and organic materials are oligotrophic, Statement II is incorrect.

Therefore, both Statement I and Statement II are incorrect.