Class 7 Biology Forests: Our Lifeline Agro-chemicals and their effects

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.

Examples-

  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.

Class_7_Biology_Forests_OurLifeLine_DecayingAnimalDung

Fig. cattle dung used as manure

Radioactive wastes

  • Radioactive wastes are those which contain radioactive materials.
  • Radiation given off by nuclear waste causes mutations to occur at a very high rate.
  • At high doses nuclear radiation is lethal but at lower doses it creates various genetic disorders such as cancer.
  • Storage of nuclear waste after pre-treatment done in shielded containers buried within the rocks, about 500 m deep below the earth’s surface.

Class_12_biology_Environmental_SheidedCotainers_For_NuclearWastes

Fig. shielded containers to store nuclear waste

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