Inorganic nutrient pollution

Question 1

2 sources

Answer 1

-phosphates in sewage effluent
-nitrogen washed off from fertiliser in farmland

Question 2

Effects

Answer 2

Eutophication
-excess nutrients causes extreme algal growth
-this reduces light levels below the algae
-so less photosynthesis by aquatic plants
-they die and saprobiotic bacteria decompose aerobically
-reducing dissolved o2 levels causing fish to die

Question 3

2 Controls

Answer 3

-Reduced use of nitrate fertilisers
-reduce reliance on fertilisers e.g legumes