Question

The given figure represents biomagnification of DDT in an aquatic food chain. Select the incorrect statement regarding this -

• A. When agricultural fields are sprayed with DDT, it is carried by runoff water into nearby aquatic bodies.
• B. River water may have a very low concentration of DDT, but the concentration of DDT, which is still suitable for consumption by human beings.
• C. Increased concentration of DDT in birds affects calcium metabolism due to which egg shells become thin and break before maturity.
• D. None of these

Answer 1

Answer: (B)

River water may have a very low concentration of DDT, but the concentration of DDT, which is still suitable for consumption by human beings.

River water will always have a very low concentration of DDT, but as we go to higher trophic levels concentration of DDT increases due to biomagnification. So, carnivorous fish has a high level of DDT and it is not suitable for consumption by human beings, because of the presence of DDT.