Question

how does the use of excess of fertilizers and pesticides effect of water bodies

Answer 1

the excess use of fertilizers and pesticides effect the water bodies as they cause pollution
due to precipitation the water takes the pesticides and fertilizers on the plant or on the soil to the water bodies
which causes a layer of algae to form on it which causes algae Bloom
which decreases DO and increases BOD

Answer 2

The Excessive use fertilizers and pesticides will kill the organisms living in the water bodies like fish and other microorganisms

Hope This Helps