Question

Distinguish between the following.

Eutrophication and Biomagnification.

Answer 1

Sr. No.	Feature	Eutrophication	Biomagnification
1.	Core Definition	Eutrophication is the over-enrichment of a water body with nutrients, which triggers the excessive growth of algae and aquatic plants.	Biomagnification is the progressive increase in the concentration of a toxic substance inside living organisms at each successive level of a food chain.
2.	Primary Chemical Agents	This process is driven by excessive amounts of nutrients like nitrates and phosphates from agricultural runoff and sewage.	This process is driven by toxic, persistent, and fat-soluble substances like the pesticide DDT and heavy metals like mercury.
3.	Mechanism of Impact	It causes massive algal blooms that block sunlight and deplete dissolved oxygen when the algae die and decompose, suffocating aquatic life.	It causes higher-level predators to accumulate dangerous doses of toxins because they must consume large quantities of contaminated prey.
4.	Target of Impact	This phenomenon primarily destroys entire aquatic ecosystems like lakes, ponds, and slow-moving rivers.	This phenomenon primarily harms apex predators at the top of the food chain, including large fish, birds of prey, and humans.
5.	Visible Symptoms	The most common signs are green, thick scum on the water surface and sudden, massive fish kills due to oxygen starvation.	The most common signs are reproductive failures and population declines in top predators, such as the thinning of eagle eggshells.