Question

PLEASE HELP GIVING 100 POINTS!!!!!

Cyanobacteria are photosynthetic single-celled organisms that thrive on the sunlight and nutrients. Cyanobacteria blooms (blue-green algae) are a frequent occurrence in the Great Lakes, particularly in Lake Erie, Green Bay, and Saginaw Bay in August and early September. Which statement(s) describes the main cause(s) of the cyanobacteria blooms in the Great Lakes?

I. Increase in human population and activities such as industrialization and agriculture.
II. The nutrient levels of the Great Lakes are lower due to increased pollution.
III. Low oxygen levels in the Lakes attract cyanobacteria.

A. I only
B. II only
C. I and II
D. II and III

Answer 1

The statement that describes the main cause of the cyanobacteria blooms in the Great Lakes is "increase in human population and activities such as industrialization and agriculture"

ALGAL BLOOM:

• Algal bloom refers to the rapid proliferation in growth of algae species in a body of water.

• Algae species like the cyanobacteria described in this question thrive best and increase rapidly when they are exposed to an abundance of nutrients like phosphate and nitrate.

• The source of these nutrients (phosphate and nitrate) include runoff of fertilizers and pesticides into water. Fertilizers contain nitrogen, phosphorus etc., which are source of nutrients for algae.

• Agricultural practices like farming etc. and industrialization are major processes that release these nutrient-containing substances into the water.

• Therefore, statement that describes the main cause of the cyanobacteria blooms in the Great Lakes is "increase in human population and activities such as industrialization and agriculture"

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