India will release nearly 392,000 tonnes of microplastics into its waterbodies this year. Only China releases more. This article covers chemical threats to biodiversity — plastics and pesticides — how they move through food chains long after they’re released, and the exact PYQs built on these terms.
Must Know
Sources of Chemical Threat
- StoryChemical threats to biodiversity come from several sources: pesticides, plastics and microplastics, industrial effluents, and heavy metals.
India’s Microplastic Release
- DataIndia is projected to release about 391,879 tonnes of microplastics into waterbodies in 2024 — the second-highest amount globally, after China’s 787,069 tonnes.
Rivers as the Main Conduit
- DataRivers carry roughly 80% of all plastic that eventually reaches the ocean worldwide.
Pesticides and Pollinators
- StoryPesticides, especially neonicotinoids, are linked to declining bee and butterfly populations in India, weakening pollination and crop yields.
Good to Know
India’s Plastic Waste Footprint
- DataIndia generates about 4.13 million tonnes of plastic waste every year, domestically.
The Yamuna and Ganga Numbers
- DataA study across Delhi, Mathura, Haryana, and Agra found the Yamuna carrying an average of about 14,717 microplastic particles per litre, across 29 sampling points.
- DataIn Bihar’s stretch of the Ganga, sediment samples showed 99 to 410 microplastic items per kilogram.
Pesticide Regulation in India
- StoryIndia updates its list of banned, restricted, and refused pesticides regularly. The latest revision took effect on 31 March 2024.
✅ Test Yourself
Work through a 5-question chain covering India’s microplastic release, biomagnification, and pesticide-pollinator links, then keep practising with a random Environment and Ecology question.
Great to Know
Why These Threats Stay Invisible
- WhyChemical threats differ from threats like habitat loss. They’re often invisible until concentrations build up in the food chain — a process called biomagnification.
The Same Pattern, Twice
- StoryMicroplastics and pesticides both follow this pattern. A small individual dose looks harmless, but the effect compounds moving up the food chain, from plankton to fish to larger predators.
Regulation Lags Exposure
- InsteadPesticide bans get updated periodically, but new agrochemicals enter use faster than older ones get phased out.
- LinkFor pollution types and core ecosystem terms, see EnvEco0001 — Pollution, Ecosystems and Biodiversity. For India’s solid waste and e-waste systems, see EnvEco0011 — Solid and Hazardous Waste.
PYQ / Exam Angle
CAPF 2017: What Biomagnification Means
- QuestionCAPF (ACs) 2017 asked what the term Biomagnification refers to. The answer is the accumulation of an increasing amount of a non-degradable pollutant through the food chain.
- WhyEach predator accumulates the pollutant load of all the prey it eats faster than it can excrete it, so concentrations rise at each trophic level.
- LinkSource: CAPF (ACs) 2017, General Ability and Intelligence (see Q106).
CDS 2018: Bioaccumulation vs. Biomagnification
- QuestionCDS-I 2018 tested two statements distinguishing bioaccumulation from a food-chain example. The answer is that both are individually true, but the second does NOT explain the first.
- WhyBioaccumulation is build-up within a single organism over time; the fish-vs-plankton example instead describes biomagnification, a related but distinct process across trophic levels.
- LinkSource: CDS-I 2018, General Knowledge (see Q18).
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EnvEco0011 — Solid and Hazardous WasteUPSC CSP 2019 — General Studies Paper I (Full Question Paper)UPSC CSP 2024 — General Studies Paper I (Full Question Paper)UPSC CSP 2026 — General Studies Paper I (Full Question Paper)UPSC CSP 2023 — General Studies Paper I (Full Question Paper)❓ Practice this topic
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