Question

Which of the following can cause excess growth of algae in water?

1) large amounts of fecal coliform
2) high nitrate content
3) high phosphate content
4) All of the above

Answer 1

Option 4, All of the above

Explanation:

Growth of algae in water enhances when the water gets nutrient enriched. The high content of nitrogen and phosphate increases the productivity of water and hence algal boom like situation arises. This is a common phenomenon during rainy season when nutrient enriched runoff from agricultural fields enters nearby pool or lake. This causes scenarios like eutrophication.

Also excess amount of coliform (biomass) in turn ensures excess of food supply thereby leading to algal boom.

Hence option 4 is correct

Answer 2

For the answer to the question above,m theyare actually bacteria (cyanobacteria). Some algal blooms are the result of an excess of nutrients (particularly phosphorus and nitrogen) into waters and higher concentrations of these nutrients in water cause increased growth of algae and green plants.
So I believe the answer is 4) All of the above.