Class 12 Biology Environmental Issues Agro-chemicals and their effects


  • The chemicals which are used in agriculture are called agro-chemicals. Example- herbicides, fungicides, pesticides.
  • Increasing amounts of artificial fertilizers can cause eutrophication.
  • Integrated organic farming is a cyclical zero-waste procedure where waste products from one process are cycled in as nutrients for other processes.


  1. Cattle excreta (dung) are used as manure.
  2. Crop waste is used to create compost, which can be used as a natural fertilizer or can be used to generate natural gas.


Fig. cattle dung used as manure

Share these Notes with your friends  

< Prev Next >

You can check our 5-step learning process