Pollution Ecology & Toxicology

Pollution is the effect of undesirable changes in our environment that have harmful effects on all living Organisms. During the last few decades we have polluted our environment on which life itself depends with a variety of waste products.

Toxicology is the study of chemical or physical agents that produce adverse responses in the biological systems with which they interact.

From an Ecological point of view, pollutants can be classified as Degradable or Non-persistent pollutants which can be rapidly broken down by natural process. e.g. domestic sewage, discarded vegetables etc., Slowly-degradable or Persistent pollutants are pollutants that remain in the environment for many years in an unchanged condition and take decades or longer to degrade. e.g. DDT(pesticides) and most plastics. Non-degradable pollutants cannot be degraded by natural processes. Once they are released into the environment they are difficult to eradicate and continue to accumulate.eg: toxic elements like lead or mercury and nuclear wastes.

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