The correct option is (c) Eutrophic lakes are richer in nutrients.
Eutrophic lakes feature high concentrations of plant nutrients, such as nitrogen and phosphorus, and therefore sustain high plant productivity.
- They are generally more nutrient rich than oligotrophic or mesotrophic lakes. Two times a year, in the spring and the fall, dimictic lakes change. This re-mixes the nutrients and dissolved oxygen that the lake's plants and creatures need.
- The top water cools and gets denser in the fall than the bottom waters do. The lake water is mixed as the cooler water sinks to the bottom.
- As the temperature drops in the winter, ice builds up on top of the lake and prevents any more mixing. When the lake is heated by the sun in the spring, the cooler, less dense water rises to the surface while the warmer, denser water sinks.
- The temperature and density disparities between the upper and bottom water layers grow increasingly pronounced as the summer goes on. In the summer and winter, these lakes typically physically stratify into three discernible strata.
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