Question

What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?

Answer 1

Biological magnification is defined as the phenomena of accumulation or increase in the concentration of some toxic substances at each trophic level.
The levels of biomagnifications will be different at different trophic levels. For example, in a pond of water, DDT was sprayed and the producers were found to have usually 0.04 ppm concentration of DDT.
Since many types of planktons are eaten by some fishes and clams, their body accumulates usually 0.23 ppm of DDT (higher than planktons). A seagull that feeds on clams accumulates more DDT. Eagle, being the top carnivore, has the highest concentration of DDT concludes different levels of toxic compounds in each trophic level.