OBJECTIVE LIFE SCIENCE
ECOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
DDT
|
|
|
PCB
|
|
|
Mercury
|
|
|
Glucose
|
Detailed explanation-1: -Materials that cause biomagnification include heavy metals like mercury, arsenic, pesticides such as dichloro-diphenyl-trichloroethane (DDT), polychlorinated biphenyls(PCBs), etc. Agricultural pesticides, fertilizers, etc.
Detailed explanation-2: -Biomagnification refers to increase in concentration of toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolised or excreted, and is thus passed on to the next higher trophic level. This phenomenon is well-known for mercury and DDT.
Detailed explanation-3: -Explanation: Pollutants need to satisfy characteristics like long life, biologically active, soluble in fat etc. to make biomagnification possible. Biomagnification refers to a process of Biological Magnification, meaning the increase of contaminated substances/toxic chemicals that take place in the food chains.