Question

Which of the following is associated with biological amplification?
A. $SO_4$
B. DDT
C. Sewage
D. All of the above

Answer 1

Hint: Biomagnification also understood as bioamplification or biological magnification. It is defined as the concentration of a toxin in the tissues of organisms in a food chain. The increased level of toxin can occur due to Persistence, Food chain energetics and Low or non-existent rate of internal degradation or excretion of the substance.

Complete Answer:
- Biomagnification is the toxins in the food chain. The various trophic levels of an ecosystem interconnect with each other and they are essential for the survival of each other.
- Biological magnification is a process where pollutants such as pesticides or heavy metals come in contact with the food chain, transfer into rivers or lakes and are eaten by aquatic organisms such as fish and these fishes eaten by large birds, animals or humans.
- It all happened because of an increase in the concentration of a substance, such as DDT or mercury, in an organism.

So, the correct answer is DDT.

Additional information:
- DDT concentration represents the parts per million.
- Bioaccumulation are toxic substances when their concentration in living organisms is increased because they take in contaminated air, water, or food and these substances are very slowly metabolized or excreted.

Note: The length of a food chain is a continuous variable that gives a measure of the passage of energy and an index of ecological structure that increases through the linkages from the lowest to the highest trophic (feeding) levels.