EVERYDAY SCIENCE

SCIENCE

ECOLOGY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Lakes with an abundance of organic material and low oxygen in the deeper regions are called ____
A
eutrophic lakes
B
oligotrophic lakes
C
thermally stratified
D
None of the above
Explanation: 

Detailed explanation-1: -Eutrophic lakes: These display high concentration of nutrients, high biomass productivity and low transparency. Oxygen concentrations can get very low (as low as 1 mg/L) in the hypolimnion during summer.

Detailed explanation-2: -Advanced eutrophication may also be referred to as dystrophic and hypertrophic conditions. Eutrophication can affect freshwater or salt water systems. In freshwater ecosystems it is almost always caused by excess phosphorus.

Detailed explanation-3: -The prototypic oligotrophic lake is a large deep lake with crystal clear waters and a rocky or sandy shoreline. Both planktonic and rooted plant growth are sparse, and the lake can support a coldwater fishery. A eutrophic lake is typically shallow with a soft and mucky bottom.

Detailed explanation-4: -Eutrophic conditions form when a water body is “fed” too many nutrients, especially phosphorus and nitrogen. The excess food causes algae to grow out of control, and when the algae die off, the bacteria present use up a lot of the dissolved oxygen in the water body.

Detailed explanation-5: -Eutrophic state: Waters extremely rich in nutrients, with high biological productivity. These lakes have higher concentrations of phosphorus and chlorophyll and poorer clarity. Typically, they are shallow, often muddy and contain an abundance of aquatic plants.

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