Discuss why pesticides are used in very accurate concentration and in a very appropriate manner.

(N/A) Pesticides are used in very accurate concentrations and in a very appropriate manner because,if used in excess,they:
$(a)$ Harm the soil and cause a loss of fertility.
$(b)$ Check the replenishment of organic matter.
$(c)$ Kill the beneficial micro-organisms of the soil.
$(d)$ Cause air,water,and soil pollution.