| An Eutrophic lake is characterised by |
| 1. an excessive growth of plant biomass. |
| 2. development of zones without oxygen. |
| 3. small less desirable fishes replace larger and more desirable species. |
| 4. algal blooms and scums. |
| Which of the statements given above are correct? |
A) 1 and 2
B) 1, 2 and 3
C) 1, 2 and 4
D) All of these
Correct Answer: D
Solution :
[d] Eutrophication is the ecosystem response to the addition of artificial or natural substances, such as nitrates and phosphates, through fertilisers or sewage, to an aquatic system. There will be a great increase of phytoplankton in a water body as a response to increased levels of nutrients. Negative environmental effects include hypoxia, the depletion of oxygen in the water, which induces reductions in specific fish and other animal populations. Other species (such as Nomura's jellyfish in Japanese water) may experience an increase in population that negatively affects other species.
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