Question

Eutrophication is often seen in-
a. Oceans
b. Mountains
c. Desserts
d. FreshWater Lakes

Answer 1

Hint: Eutrophication is the occurrence of nutrient fortification of nitrogen and phosphorus. It causes intense growth in plants and animal life. Given the widespread amount of water quality degradation linked with nutrient enrichment, eutrophication has and continues to front a serious threat to the environment.

Complete answer:
Due to nutrient enrichment, the glut growth of algae occurs which is known as an algal bloom. When these algae expire, their organic matter gets decayed and this results in the depletion of oxygen leading to the death of aquatic animals. This process is called eutrophication.

The most noticeable effect of cultural eutrophication is the construction of dense blooms of noxious, foul-smelling phytoplankton that lessen water clarity and damage water quality. Algal blooms bind light penetration, plummeting growth, and leading die-offs of plants in littoral zones and also lowering the success of predators that need light to track and seize prey.

Eutrophication is habitually seen in freshwater lakes because they often get tainted by sewage water and house wastewater containing a high amount of nutrients that can promote excess algal growth.

Hence, the correct answer is option (D).

Note: Moreover, high rates of photosynthesis-related with eutrophication can deplete dissolved inorganic carbon and lift pH to extreme levels during the day. Elevated pH can in turn ‘blind' organisms that depend on the perception of dissolved chemical cues for their endurance by impairing their chemosensory abilities.
When these dense algal blooms eventually die, microbial decomposition severely depletes dissolved oxygen, forming a hypoxic or anoxic ‘dead zone' lacking adequate oxygen to support most organisms.