Question

DDT content in the water of a lake, that supplies drinking water to the nearby villages, is found to 0.0Q3 ppm. The king fishers of that area are reported to have 2 ppm DDT.

1. Why has the concentration increased in these birds?

2. What harm will this cause to bird population?

3. Name the Phenomenon.

Answer 1

1. Increase in concentration of DDT (non biodegradable) from the water bodies (0.003ppm) to the final consumers like king fishers (2 ppm) is due to increase in cone, of DDT in successive tropic levels

eg. Phytoplankton → Zoo planktons → Fishes → King Fishers) of food chain.

2. It affects ca metabolism and finally premature breaking of egg and declining bird population.

3. Bio magnification.