Question

What threats to nature do chemical fertilizers, pesticides, insecticides and herbi-cides pose?

Answer 1

• When we use insecticides to kill pests or weedicides/herbicides to destroy weeds, a large percentages of herbicides, chemical fertilizers, pesticides, insecticides remain in the soil. 
• From the soil, these chemicals find their way into water sources. 
• People spray these chemicals in fields are exposed to them and some of the chemicals enter their body. 
• Insecticides destroy all insects in which some of them are useful in pollination. 
• Extensive use of chemical fertilizers, pesticides, herbicides and weedicides makes the soil unsuitable to grow crops after sometime.