How does eutrophication work?

  1. Fertilisers containing nitrogen are washed from fields to rivers and ponds. 2. This effectively fertilises the algae in the pond causing an 'algal bloom'. 3. The layer of algae on the surface stops sunlight from getting to the plants below. This means they cannot photosynthesize to produce oxgen.4. The plants die which further depletes the oxgen in the water as the bacteria decomposing them use oxygen. 5. The low oxygen levels cause fish and other organims in the water to die. 
IH
Answered by Iona H. Biology tutor

4026 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

What are the four stages of aerobic respiration in humans?


How do I get an A* in biology?


Define the term 'water potential' and describe the difference between isotonic, hypotonic and hypertonic solutions. Suggest the different effects on cells placed in the different solutions.


Explain how CO2 can cross a cells plasma membrane


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning