Why does the increased level of nutrients in the water affect the survival of aquatic organisms?  



Farmers use pesticides and weedicides to increase crop production

These excess fertilizers dissolve in water and run into rivers, lakes and ponds. 

Thus, it increases the nutrient level in pond

Due to this, tiny green water plants called algae grows in the river

When algae dies,
bacteria decomposes them by consume oxygen from the pond 

Due to which, the oxygen level in the pond decreases

And, Aquatic organisms do not get enough oxygen and begin to die


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  1. Class 8
  2. Chapter 18 Class 8 - Pollution of Air and Water

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Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.