Topic 16: Biodiversity of India
India's biodiversity statistics, the 10 biogeographic zones (Rodgers & Panwar classification), the Western Ghats Ecology Expert Panel (Gadgil Commission) and Kasturirangan Report on ecologically sensitive areas, and the National Bamboo Mission.
Table of Contents
Conceptual Clarity — Why this Topic Matters
UPSC tests India's biodiversity in three distinct ways:
- Definitional / static: direct-recall facts — number of biogeographic zones (10), largest zone (Deccan Peninsula), which classification (Rodgers & Panwar 1988), megadiverse-country criteria, number of hotspots in India (4 of 36).
- Statement-elimination: multi-statement questions mixing one true + one false claim — swapping Gadgil vs Kasturirangan coverage figures, mis-pairing a zone with the wrong region, or the cultural-vs-natural landscape distinction.
- Applied / current: Western Ghats ESA notification delays, Wayanad landslides, bamboo-sector policy — feeding prelims news-recall + Mains GS-III development-vs-ecology answers (see Current Affairs section).
Focus especially on the 10 zones + their representative regions, Gadgil vs Kasturirangan differences, and the 2017 bamboo "grass" reclassification — the three highest-frequency themes.
1. India's Biodiversity — Key Statistics
- India occupies just ~2.4% of world's land area, harbours ~7-8% of all recorded global species — one of 17 megadiverse countries (Topic 11).
- Hosts 4 of the world's 36 biodiversity hotspots (Western Ghats, Eastern Himalaya, Indo-Burma, Sundaland — via Nicobar Islands; Topic 13) and 10 distinct biogeographic zones.
- Significant endemism across flora and fauna, particularly amphibians and freshwater fish in the Western Ghats.
| Parameter | India's Figure | Exam-relevant note / example |
|---|---|---|
| Share of world land area | ~2.4% | Yet holds ~7–8% of recorded species — the "megadiverse" contrast |
| Megadiverse rank | 1 of 17 nations | List maintained by UNEP-WCMC; India + 16 others hold ~70% of Earth's biodiversity |
| Global biodiversity hotspots | 4 of 36 | Western Ghats, Eastern Himalaya, Indo-Burma, Sundaland (Nicobar) |
| Biogeographic zones | 10 | Rodgers & Panwar (1988), adopted by Wildlife Institute of India |
| Recorded fauna (approx.) | ~1,00,000+ animal species | Documented by Zoological Survey of India (ZSI) |
| Recorded flora (approx.) | ~50,000+ plant species | Documented by Botanical Survey of India (BSI) |
| Endemism stronghold | Western Ghats | High amphibian & freshwater-fish endemism (e.g. purple frog Nasikabatrachus) |
India's Centres of Endemism & Notable Endemic Species
Endemic = found nowhere else on Earth. India's endemism concentrates in three regions — the two "cradles" (Western Ghats, NE India/Eastern Himalaya) plus the isolated islands (A&N). Know at least one flagship endemic per region:
| Centre of endemism | Notable endemic species |
|---|---|
| Western Ghats | Purple/pig-nosed frog (Nasikabatrachus sahyadrensis), Nilgiri tahr, lion-tailed macaque, Malabar civet, Nilgiri langur |
| Eastern Himalaya / North-East | Hoolock gibbon (India's only ape), pygmy hog, Namdapha flying squirrel, golden langur, white-winged wood duck |
| Andaman & Nicobar Islands | Nicobar megapode, Andaman wild pig, Nicobar tree shrew, Andaman day gecko |
| Peninsular / other | Asiatic lion (Gir — only wild population), one-horned rhino (Kaziranga), Kashmir stag/hangul, Sangai deer (Loktak) |
2. Conceptual Clarity — Zone, Biome, Hotspot
Don't confuse these three
- Biogeographic zone: administrative/scientific unit for conservation planning within a country, based on plant/animal communities + physiography (India: 10 zones, Rodgers & Panwar 1988).
- Biome (Topic 05): global-scale classification by climate + dominant vegetation (e.g., tropical rainforest, desert), transcends national boundaries.
- Biodiversity hotspot (Topic 13): Conservation-International-defined global priority area meeting strict endemism + habitat-loss criteria.
- India's biogeographic zones are the finest-grained of the three — basis for protected area network planning.
3. India's 10 Biogeographic Zones
- Rodgers & Panwar classification (1988), adopted by Wildlife Institute of India, divides country into 10 biogeographic zones for systematic conservation planning.
- Ensures protected area network represents India's full ecological diversity rather than clustering in a few regions.
| Zone | Representative area |
|---|---|
| 1. Trans-Himalaya | Ladakh, Lahaul-Spiti — cold desert, snow leopard habitat |
| 2. Himalaya | Western, Central and Eastern Himalayan ranges |
| 3. Desert | Thar (Rajasthan/Gujarat) and cold desert fringes |
| 4. Semi-Arid | Gujarat, Rajasthan, parts of peninsular India |
| 5. Western Ghats | Kerala, Karnataka, Tamil Nadu, Maharashtra hill ranges |
| 6. Deccan Peninsula | Largest zone, central Indian plateau region |
| 7. Gangetic Plain | Indo-Gangetic alluvial plains |
| 8. Coasts | Western and eastern coastlines, Lakshadweep |
| 9. North-East India | Assam, Meghalaya, other NE hill states — Indo-Burma hotspot overlap |
| 10. Islands | Andaman and Nicobar Islands |
4. Gadgil Commission (WGEEP, 2011)
- Western Ghats Ecology Expert Panel (WGEEP), chaired by Madhav Gadgil, submitted report in 2011.
- Recommended entire Western Ghats (~1,64,280 sq km) be declared Ecologically Sensitive Area (ESA), divided into 3 zones (ESZ I, II, III) with graded restrictions.
- ESZ I (highest sensitivity) faced strictest curbs on mining, quarrying, polluting industries.
- Proposed bottom-up, participatory governance — empowering local Panchayats and Gram Sabhas.
5. Kasturirangan Report (2013)
- High Level Working Group, chaired by K. Kasturirangan (former ISRO chief), constituted to review Gadgil report after state objections.
- Recommended narrower approach — only ~37% of Western Ghats (~60,000 sq km) classified ecologically sensitive.
- Based on satellite-mapped split: "cultural landscape" (human-dominated, e.g. plantations/settlements) vs "natural landscape" (largely undisturbed forest).
- Restrictions applied mainly to natural landscape portion.
6. Gadgil vs Kasturirangan — Comparison
| Aspect | Gadgil Report (WGEEP, 2011) | Kasturirangan Report (2013) |
|---|---|---|
| ESA coverage | Entire Western Ghats (~100%) | ~37% of Western Ghats (natural landscape only) |
| Zoning approach | 3-tier ESZ I/II/III graded system | Binary cultural vs natural landscape distinction |
| Governance model | Bottom-up, Gram Sabha/Panchayat empowerment | More top-down, state-implemented |
| Reception | Rejected by most state governments as too restrictive | Still faced local opposition, but seen as a more "workable" compromise |
7. National Bamboo Mission
- National Bamboo Mission (NBM) promotes holistic bamboo sector development — cultivation, processing, market linkages, value-added products.
- Recognises bamboo's dual role: rural livelihoods (fast-growing, high-yield cash crop) + ecological restoration (soil binding, degraded land rehab, carbon sequestration).
- 2017 amendment to Indian Forest Act, 1927 reclassified bamboo on non-forest land as "grass" not "tree" — removed felling/transit permit requirements, eased farmer cultivation.
8. Current Affairs (2024–2026)
The living, fastest-changing edge of this topic — verify each against the latest notification before your attempt.
Through 2024–2025 the final Ecologically Sensitive Area notification for the Western Ghats (balancing Gadgil/Kasturirangan) remained pending after repeated draft extensions — the 6th draft was issued by MoEFCC, still awaiting the six states' concurrence (Kerala, Karnataka, Tamil Nadu, Maharashtra, Goa, Gujarat).
The catastrophic July 2024 Wayanad (Kerala) landslides — hundreds dead — intensified scientific and political debate over delayed ESA implementation and unregulated land-use change (quarrying, plantations, construction) in Western Ghats sensitive zones.
Continued 2024–2025 expansion of bamboo-based industries (handicrafts, construction, engineered bamboo, biofuel/ethanol) as a climate-resilient rural livelihood, building on the 2017 IFA "grass" reclassification.
9. Prelims PYQs
Q. With reference to India's biogeographic classification, consider the following statements:
1. India is divided into 10 biogeographic zones as per the Rodgers and Panwar classification.
2. The Deccan Peninsula is the largest biogeographic zone by area.
3. The Andaman and Nicobar Islands form a single biogeographic zone with the Western Ghats.
Which of the statements given above is/are correct?
Ans: (a). 1 and 2 only — Islands are a separate zone (10), distinct from Western Ghats (5).
Q. The Western Ghats Ecology Expert Panel (2011) is popularly associated with which of the following?
Ans: (b). Madhav Gadgil — WGEEP is the "Gadgil Commission."
Q. Consider the following statements regarding the Kasturirangan Report (2013):
1. It recommended declaring the entire Western Ghats as an Ecologically Sensitive Area.
2. It distinguished between "cultural landscape" and "natural landscape" within the Western Ghats.
3. It recommended a lower percentage of ESA coverage than the Gadgil Committee report.
Which of the statements given above is/are correct?
Ans: (b). 2 and 3 only — Kasturirangan recommended only ~37% (not the entire Ghats), so statement 1 is false.
Q. The amendment to the Indian Forest Act, 1927 reclassifying bamboo grown on non-forest land had which of the following effects?
Ans: (b). Reclassified as "grass" (2017) on non-forest land — no felling/transit permit needed.
Q. Which of the following biogeographic zones of India includes the Thar Desert?
Ans: (b). Desert Zone (Thar) — distinct from the adjoining Semi-Arid Zone.
Q. India's status as a megadiverse country is attributed to which of the following?
1. High species richness relative to land area
2. High degree of endemism
3. Presence of 10 distinct biogeographic zones
Select the correct answer using the code given below:
Ans: (a). Megadiversity = species richness + endemism; the number of biogeographic zones is not a megadiverse criterion.
Q. The Trans-Himalayan biogeographic zone of India is best represented by which region?
Ans: (b). Ladakh & Lahaul-Spiti — cold-desert Trans-Himalaya, snow leopard habitat.
10. Mains PYQs
Q. Compare and contrast the Gadgil Committee and Kasturirangan Committee recommendations on Western Ghats conservation. Which approach do you consider more sustainable, and why?
Model Answer Framework
- Introduction: Both panels addressed the same problem — protecting the Western Ghats hotspot — but differed sharply on how much to protect and how, shaping India's still-unresolved ESA debate.
- Body — Compare:
- Coverage: Gadgil — entire Ghats (~100%) as ESA; Kasturirangan — only ~37% (natural landscape).
- Zoning: Gadgil — 3-tier ESZ I/II/III graded restrictions; Kasturirangan — binary cultural vs natural landscape.
- Governance: Gadgil — bottom-up, Gram Sabha/Panchayat empowered; Kasturirangan — more top-down, state-implemented.
- Reception: Gadgil rejected by states as too restrictive; Kasturirangan seen as a "workable" compromise but still contested.
- Body — Which is more sustainable:
- Argue Gadgil's ecological rigour + participatory governance is scientifically sounder for long-term hotspot integrity (Wayanad 2024 vindicates stronger safeguards).
- But Kasturirangan's realism improves political feasibility — sustainability needs implementability, not just ambition.
- Conclusion: A balanced path — Gadgil's graded, participatory framework applied to a scientifically-defined core — best reconciles ecology with livelihoods.
Q. Discuss the significance of India's biogeographic zone classification for conservation planning and Protected Area network design.
Model Answer Framework
- Introduction: The Rodgers & Panwar (1988) classification divides India into 10 biogeographic zones — the scientific backbone of the Wildlife Institute of India's protected-area planning.
- Body — Significance:
- Representativeness: ensures the PA network samples every ecological zone, not just charismatic forests — from Trans-Himalayan cold desert to Islands.
- Gap analysis: identifies under-protected zones (e.g. grasslands, semi-arid) for new sanctuaries/reserves.
- Finest-grained unit: more actionable for domestic planning than global biomes or hotspots.
- Corridor & landscape design: guides connectivity across zones for wide-ranging species.
- Body — Limitations: zones are broad; sub-zonal micro-endemism (Western Ghats) needs finer tools; climate change is shifting zone boundaries.
- Conclusion: The 10-zone framework remains the organising principle for systematic, representative conservation — but must be updated with climate-shift and connectivity data.
Q. The Western Ghats face increasing ecological stress from unregulated development. Critically examine the delay in implementing Ecologically Sensitive Area notifications.
Model Answer Framework
- Introduction: Despite two expert reports (2011, 2013), the final Western Ghats ESA notification remains unissued after multiple draft extensions — a decade-long governance failure.
- Body — Drivers of delay:
- State resistance (Kerala, Karnataka, Goa, Maharashtra) over restrictions on mining, quarrying, plantations, tourism.
- Livelihood & land-rights concerns of Ghats communities.
- Centre-state coordination gaps; repeated re-drafting to accommodate objections.
- Body — Consequences:
- Continued unregulated land-use change → landslides (Wayanad 2024), biodiversity loss, altered hydrology.
- Erodes ecological resilience of a global hotspot supplying peninsular India's rivers.
- Conclusion: A scientifically-defined, participatory ESA with livelihood safeguards must be finalised urgently — delay converts a policy gap into recurring human and ecological disaster.
Q. Discuss the role of the National Bamboo Mission in promoting sustainable rural livelihoods and ecological restoration in India.
Model Answer Framework
- Introduction: The National Bamboo Mission (NBM) promotes holistic bamboo-sector development, leveraging bamboo's dual value — livelihood + ecology — as a climate-resilient crop.
- Body — Livelihood role:
- Fast-growing, high-yield cash crop; supports handicrafts, construction, engineered bamboo, agarbatti, biofuel.
- 2017 IFA amendment reclassified bamboo on non-forest land as "grass" → no felling/transit permit → eased farmer cultivation and trade.
- Value-chain, processing and market-linkage support under the Mission.
- Body — Ecological role:
- Soil binding, degraded-land rehabilitation, watershed protection.
- Rapid carbon sequestration; substitutes wood/plastic (lower footprint).
- Body — Challenges: quality planting material, industry-scale processing gaps, market volatility.
- Conclusion: NBM links green livelihoods with ecological restoration — a model of the bio-economy if processing and market bottlenecks are resolved.
Q. "India's status as a megadiverse nation is closely tied to its diverse biogeographic zones." Elaborate with suitable examples.
Model Answer Framework
- Introduction: India is 1 of 17 megadiverse nations — holding ~7–8% of global species on ~2.4% of land — a richness rooted in its 10 distinct biogeographic zones spanning cold desert to tropical islands.
- Body — Zone-diversity link (examples):
- Trans-Himalaya (Ladakh) — snow leopard, Tibetan antelope; Himalaya — red panda, musk deer.
- Western Ghats — amphibian/fish endemism (purple frog); North-East (Indo-Burma) — hoolock gibbon.
- Desert — GIB, chinkara; Coasts/Islands — mangroves, coral, Nicobar megapode.
- Body — Why zones drive diversity: varied climate, altitude, physiography → distinct habitats → high beta-diversity + endemism; 4 of 36 global hotspots lie within these zones.
- Conclusion: India's megadiversity is a direct expression of its biogeographic variety — conserving each zone is essential to sustaining that status.
15-Minute Revision Box
Must-Remember Facts — Biodiversity of India
- India: ~2.4% world land, ~7-8% world's species, 4 of 36 global hotspots, 10 biogeographic zones (Rodgers & Panwar, 1988)
- Deccan Peninsula = largest biogeographic zone | Trans-Himalaya = Ladakh/Lahaul-Spiti cold desert
- National Bamboo Mission: bamboo reclassified as "grass" (2017 IFA amendment) → no felling/transit permits on non-forest land; livelihood + ecological restoration
- Gadgil (WGEEP, 2011): entire Western Ghats as ESA, 3-tier zoning (ESZ I/II/III), bottom-up Gram Sabha governance — rejected by states as too restrictive
- Kasturirangan (2013): only ~37% (natural landscape) as ESA, cultural vs natural binary split — compromise, still contested
- ESA notification still pending as of 2025; Wayanad landslides (2024) renewed urgency