What is oil pollution? What are its impacts on the marine ecosystem? In what way is oil pollution particularly harmful for a country like India?
Approach · directive: “what / in what way”
What it asks · Define oil pollution, list its effects on marine life and habitats, and explain why India's coast, trade and livelihoods make it especially vulnerable.
The question has 3 parts — answer each
- Define oil pollution
- Explain its impacts on the marine ecosystem
- Explain in what way oil pollution is particularly harmful for a country like India
Open with · Oil pollution is the release of petroleum hydrocarbons into the sea by tanker accidents, ship operations, offshore drilling, pipelines and land run-off.
Cover
- Sources: tanker collisions and groundings, illegal tank washing and bilge discharge, offshore blowouts, pipeline and port leaks, and river run-off.
- Direct impact: oil coats birds and mammals and destroys their insulation, smothers plankton, fish larvae and shellfish, and blocks light and oxygen exchange.
- Chronic toxicity: hydrocarbons enter the food chain, taint seafood, reduce fertility and persist in sediments.
- Habitat damage: mangroves, coral reefs, seagrass beds and mudflats are hit hardest and recover slowly.
- Harm to India: a coastline of about 7,500 km, crude imports carried by sea through busy lanes, and fishing and tourism supporting millions of livelihoods.
- Sensitive sites: Sundarbans mangroves, Gulf of Mannar and Lakshadweep corals, Chilika and the Andaman waters; the Ennore spill (2017) shows the risk.
- Response: MARPOL and OPRC conventions, the National Oil Spill Disaster Contingency Plan led by the Coast Guard, port reception facilities and polluter-pays liability.
Close with · Prevention, regular surveillance and ready contingency capacity cost far less than the long clean-up and the loss of coastal ecosystems and livelihoods.
Question: UPSC's CS (Main) 2023, GS Paper III — paper ↗. Approach: Minimalist IAS, checked 30 Sept 2026 (how we verify) — UPSC publishes no model answers. ·
Model answer · 205 words (UPSC limit 150) · Minimalist IAS
Oil pollution is the release of petroleum hydrocarbons into the sea from tanker accidents, ship operations, offshore drilling, pipelines and run-off from land.
Impacts on the marine ecosystem
- Smothering: oil coats seabirds and marine mammals and destroys their insulation; slicks smother plankton, fish larvae and shellfish and block light and oxygen exchange.
- Chronic toxicity: hydrocarbons enter the food chain, taint seafood, reduce fertility and persist in sediments for years.
- Habitat loss: mangroves, coral reefs, seagrass beds and mudflats, the nurseries of marine life, are hit hardest and recover slowly.
Why India is especially vulnerable
- Exposure: a coastline of about 7,500 km, and crude imports carried by sea through some of the busiest shipping lanes in the world.
- Livelihoods: fishing and coastal tourism support millions; a spill closes fishing grounds and beaches for months.
- Sensitive sites: the Sundarbans mangroves, Gulf of Mannar and Lakshadweep corals, Chilika lagoon and the Andaman waters; the Ennore spill (2017) off Chennai showed how quickly damage spreads.
Response
- MARPOL and OPRC obligations, the National Oil Spill Disaster Contingency Plan led by the Coast Guard, port reception facilities and polluter-pays liability.
Prevention, surveillance and ready contingency capacity cost far less than the long clean-up and the loss of coastal ecosystems and livelihoods.
Written by Minimalist IAS from facts checked at source (how we verify) — a little fuller than exam length, so every part of the question is covered; in the hall, keep the structure and trim the detail. UPSC publishes no model answers: compare your structure and coverage with this, then write your own.