Correct option is D
The correct answer is (d) DDT
Explanation: (Information about the correct answer):
• Biomagnification refers to the increase in the concentration of a toxic substance at successive trophic levels.
• DDT (dichloro-diphenyl-trichloroethane) is the classic example used to study biomagnification in aquatic ecosystems.
• It is a non-biodegradable, fat-soluble substance that is not metabolized by organisms.
• When small aquatic organisms consume DDT, it accumulates in their tissues and its concentration increases as it moves up to fish and then to fish-eating birds.
• This process can lead to very high concentrations in top predators, causing reproductive issues like bird eggshell thinning.
Information Booster: (additional info around the correct answer):
• Other common substances that biomagnify include mercury and polychlorinated biphenyls (PCBs).
• High concentrations of DDT in birds like pelicans and eagles led to their inclusion on endangered species lists in the past.
Additional Knowledge: (Information about incorrect options):
chlorine (Option a)
• Often used as a disinfectant; it is highly reactive and usually does not accumulate through the food chain in the same way as DDT.
phosphates (Option b)
• These are nutrients that cause 'Eutrophication' (excessive algal growth), but they do not undergo biomagnification.
organochlorine (Option c)
• While DDT is a type of organochlorine, 'DDT' is the specific and most studied representative for this phenomenon in standard texts.
So the correct answer is (d)
