Question

Many chemicals are used to kill insects and protect plants. How could the removal of insects upset the balance of the ecosystem?

Answer 1

when harmful insects which used to benifit the crops in one or the other way are eradicated by the use of chemical the ecosystem is negatively affected

Answer 2

Killing insects to protect the crop is an age-old process, which is followed by the farmers.

To do that they used various chemicals which along with the killing the insects also harm the ecological balance too is not used in properly.

The evil effects of excessive use of these chemicals can harm the ecology by way of soil destruction, water pollution and exiting harmful gases at the time of producing the chemicals.