Check sibling questions

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

 

Answer

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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CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Accounts and English at Teachoo