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

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

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explanation:

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