Question

Phosphate containing fertilisers cause water pollution. Addition of such compounds in water bodies causes

• A. Enhanced growth of algae
  
• B. Decrease in amount of dissolved oxygen in water
  
• C. Deposition of calcium phosphate
  
• D. Increase in fish population

Answer 1

Answer: (A), (B)

Decrease in amount of dissolved oxygen in water


Phosphorus is a common constitutent of agricultural fertilizers, manure and organic waste in sewage and industrial effluent. It is an essential element for plant life. But when there is too much of it in water, it can speed up eutrophication ( excessive growth of algae) This excessive growth of algae causes more consumption of oxygen and the amount of dissolved oxygen decreases.