Water pollution occurs when chemicals, biological materials, or physical changes alter water quality and harm living organisms or make water unsuitable for intended uses. Eutrophication is a natural process where an aquatic ecosystem becomes enriched with nutrients, causing excessive growth of plants. Nutrients come from sources like fertilizers, sewage, and runoff. Increased nutrients promote rapid algae growth, which can block sunlight and reduce oxygen levels. This harms ecosystems by eliminating food sources and habitats for aquatic animals.

1. Biology Form 4 Chapter 9Title:Water Pollution and EutrophicationGroup Member:Lai FookChernLing Sung EngWong Yueh Kai

2. Water pollution is any chemical, biological, or physical change in water quality that has a harmful effect on living organism or make water unsuitable for desired uses.The Causes Of Water Pollution

3. Table of Sources, pollutants, and effects of water pollution

5. Effect of Water PollutionAddition of oxygen not sufficient to support life.

6. Addition of oil destroys life by reducing oxygen and catching fine, destroying ecosystem.

7. Reduced reproduction rate of animals.

8. Increased incidence of diseases.

9. Imbalances created in secondary food chains

10. Reduced activity of immune system.Video chip aboutWater Pollution

11. Eutrophication

12. Eutrophication is a natural process whereby an aquatic ecosystem becomes enriched with nutrients causing an excessive growth of aquatic plants.Nutrients can come from many sources such as:Fertilisers (especially Nitrates and Phophates) from agricultural fields.

13. Sewage treatment plant discharges.