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______________ is the phenomenon where the concentration of harmful non-biodegradable substances increases at successive trophic levels in a food chain.
Biomagnification
Eutrophication
Biodiversity loss
Carbon sequestration
Biomagnification
Biomagnification is the process where the concentration of toxic substances, such as pesticides (e.g., DDT) or heavy metals (e.g., mercury), increases at each successive trophic level of a food chain. This happens because these non-biodegradable substances cannot be broken down or excreted by organisms, leading to their accumulation in fatty tissues over time.
Biomagnification is the process where the concentration of toxic substances, such as pesticides (e.g., DDT) or heavy metals (e.g., mercury), increases at each successive trophic level of a food chain. This happens because these non-biodegradable substances cannot be broken down or excreted by organisms, leading to their accumulation in fatty tissues over time.
Think of it like a snowball rolling down a hill; as it moves further, it collects more and more snow, becoming much larger and heavier at the bottom than it was at the top.
B-I-O (Builds-In-Organism)
CnтАЛ=CnтИТ1тАЛ├ЧBiomagnification┬аFactor тАФ representing the concentration at level n relative to level nтИТ1
The principle relies on two factors: metabolic persistence and inefficient energy transfer. Since non-biodegradable substances are lipid-soluble and resistant to enzymatic degradation, an organism at a higher trophic level consumes multiple prey items containing the pollutant. Consequently, the total body burden of the pollutant accumulates significantly as one moves up the food web.
Substances must be non-biodegradable to undergo biomagnification.
Higher trophic levels (top predators) are most affected by the concentrated toxins.
Common examples include DDT in birds of prey and mercury in marine fish.
It is distinct from bioaccumulation, which refers to the increase in concentration within a single organism over time.
Causes reproductive failure in top predators (e.g., eggshell thinning due to DDT).
Poses severe neurological and developmental risks to humans consuming apex predators.
Disrupts entire ecosystems by killing off key predator populations.
Monitoring mercury levels in tuna and shark meat.
Studying the long-term environmental impact of banned organochlorine pesticides.
Eutrophication is the over-enrichment of water bodies with nutrients leading to algal blooms and oxygen depletion.
Carbon sequestration is the process of capturing and storing atmospheric carbon dioxide.
Biodiversity loss is the decline in the variety of life forms within a specific ecosystem.
A is correct тАФ Biomagnification refers to the progressive increase in the concentration of non-biodegradable pollutants along the food chain.
In competitive exams, always distinguish between Bioaccumulation (within one organism) and Biomagnification (across the food chain/multiple levels).
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