The Ghats, the Coast, Wetlands and Disasters of Tamil Nadu — TNPSC Group I
Weightage: GS Paper III, Unit II (75 marks) is "Environment, biodiversity and disaster management", and the TNPSC syllabus names the Nilgiris and coastal disasters such as the tsunami and cyclones. The national frame comes from the aliased UPSC CSE environment chapters. Counts of protected areas and Ramsar sites change often, so write them with "as reported" and the year.
1. Three ecosystems to know
Tamil Nadu has three connected ecosystems: the Western Ghats forests and grasslands, the long coast with its mangroves, wetlands and coral, and the dry inland scrub and tank landscape. Most questions fit one of the three.
2. Biosphere reserves
| Reserve | Year | Note |
|---|---|---|
| Nilgiri Biosphere Reserve | 1986 | The first biosphere reserve in India |
| Gulf of Mannar | 1989 | A marine biosphere reserve with coral reefs and seagrass |
| Agasthyamalai | 2001 | Shared with Kerala |
The Nilgiri Biosphere Reserve spans Tamil Nadu, Kerala and Karnataka and is home to the Nilgiri tahr, lion-tailed macaque and many endemic plants.
3. Wildlife and protected areas
- Tiger reserves include Kalakkad-Mundanthurai, Mudumalai, Anamalai, Sathyamangalam and, newer, Srivilliputhur-Megamalai.
- Elephants range across the Ghats, and the state runs elephant-conflict programmes.
- Vedanthangal is among the oldest bird sanctuaries in India, Point Calimere shelters blackbuck and flamingos, and Pichavaram and Muthupet are mangrove areas.
- Palk Bay has a Dugong Conservation Reserve, declared in 2022, the first of its kind in India.
State symbols are a favourite Prelims item: the Nilgiri tahr (state animal), the emerald dove (state bird), the palmyra palm (state tree) and the glory lily or kandhal (state flower).
4. Wetlands and Ramsar sites
Tamil Nadu is reported to hold the largest number of Ramsar sites among Indian states, which include Point Calimere, the Gulf of Mannar and the Pallikaranai Marsh in Chennai (2022). Confirm the current count before quoting a number.
Pallikaranai is an urban wetland that has shrunk through dumping and construction, which makes it a standard case of urban wetland loss.
5. The coast and its stress
- Coral reefs and seagrass in the Gulf of Mannar are stressed by bleaching and destructive fishing.
- Olive ridley turtles nest on the Chennai coast, and conservation groups and the forest department protect the nests.
- Mangroves protect against storms and support fish.
- Coastal Regulation Zone rules restrict building near the shore.
6. Disasters in the record
| Event | What it showed |
|---|---|
| Tsunami, 26 December 2004 | Heavy loss in Nagapattinam, Cuddalore and Kanyakumari; led to better warning and the Disaster Management Act, 2005 |
| Chennai floods, December 2015 | Encroached tanks and drains, extreme rain |
| Cyclone Vardah (2016) and Gaja (2018) | Wind damage to trees, power and delta crops |
| Cyclone Michaung (2023) | Chennai flooding again |
The Chennai floods are the model case for urban flooding: build-up over lakes and wetlands, weak drainage and sudden rain. The state's responses include storm-water drains, restoring water bodies and early warning.
7. Pollution and industry
- Thoothukudi Sterlite copper smelter: protests in 2018 and a state closure order, which the courts later reviewed. Use it as a case of the conflict between industry and public health.
- Ennore creek has seen oil spill and ash pollution.
- A ban on single-use plastics has applied from 1 January 2019.
8. Climate and policy
The state has set up a Climate Change Mission, a Wetlands Mission and a Green Tamil Nadu Mission to raise tree cover. Water supply uses desalination plants near Chennai, and coastal communities are included in adaptation planning.
9. A Mains structure
For an environment answer: resource, threat, law or scheme and a local case. For disasters: hazard, vulnerability, response and resilience. Add a Tamil Nadu case to avoid a generic answer.
Common traps TNPSC sets here
- Calling the Nilgiri reserve the Gulf of Mannar reserve. The Nilgiri reserve is of 1986, Gulf of Mannar of 1989.
- Giving the tsunami year as 2005. It was 2004.
- Naming Pallikaranai a mangrove. It is a freshwater marsh.
- Swapping state animal and bird. Tahr and emerald dove.
- Quoting a Ramsar number with no year. Add "as reported".
Memory aids
- "1986 Nilgiri, 1989 Mannar, 2001 Agasthyamalai": biosphere reserves.
- "Tahr, dove, palm, kandhal": the state symbols.
- "2004, 2015, 2016, 2018, 2023": disaster years.
Summary
Tamil Nadu has three biosphere reserves, several tiger reserves and a rich coastal and wetland system with many Ramsar sites. The Gulf of Mannar and Palk Bay protect coral, seagrass and dugongs.
The state's disaster record, from the 2004 tsunami to the 2015 and 2023 Chennai floods, shapes policy, and pollution disputes such as Thoothukudi show the industry-health conflict.
Exam protocol
- Use resource, threat, law and local case.
- Add "as reported" and the year to every count.
- Bring one Tamil Nadu disaster case to each disaster answer.
