Compare between eutrophication and biomagnification on the basis of the following two points:
- Cause,
- Effect
WBBSE
Class X
Life Science
05 (b) Environmental Pollution
02 Mark
2025
| Point | Eutrophication | Biomagnification |
|---|---|---|
| Cause | Excess nutrients (mainly nitrates and phosphates) added to water bodies from sewage, fertilizers and detergents increase growth of phytoplankton and algae. | Persistent, non‑biodegradable pollutants like DDT, heavy metals enter food chains and are not broken down; they pass from one trophic level to the next. |
| Effect | Dense algal bloom, depletion of dissolved oxygen, death of fish and other aquatic organisms, deterioration of water quality. | Progressive increase in concentration of toxin from producers to higher trophic levels, causing physiological and reproductive damage, especially in top consumers and man. |
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