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