Question

give an example to illustrate the indiscriminate use of pesticides may result in degradation of environment

Answer 1

if pesticides are washed away by water,they went to near by water form and cause excess growth of algea which leads to decrease in oxygen in water causes death of organisms called eutrophication 

Answer 2

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The pesticides used in crop field are washed down into the water bodies. From water bodies, these are absorbed by aquatic plants and animals of a food chain and thereby degrades the environment.