Which one of the following National Parks has a climate that varies from tropical to subtropical, temperate and arctic?
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- AKhangchendzonga National Park
- BNandadevi National Park
- CNeora Valley National Park
- DNamdapha National Park
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Answer: (D) Namdapha National Park
Namdapha National Park, located in the Changlang district of Arunachal Pradesh, is unique because of its extraordinary altitudinal range — from about 200 metres at its lowest point to over 4,500 metres (Dapha Bum peak).
This massive altitude variation creates a complete spectrum of climate zones within a single national park:
- tropical forests at lower elevations,
- subtropical forests in the mid-range,
- temperate forests higher up,
- and near-arctic/alpine conditions at the highest points.
This is why it has one of the richest biodiversity in India, hosting species from different climate zones — from tropical species like the Hoolock Gibbon (India's only ape) and Namdapha flying squirrel (found nowhere else in the world) to temperate/alpine species like the Red Panda and Snow Leopard.
Why are the other options less suitable?
(a) Khangchendzonga National Park (Sikkim) — has altitude variation but starts at a higher base elevation, so it mainly covers subtropical to alpine zones, missing the true tropical belt.
(b) Nanda Devi National Park (Uttarakhand) — mostly at high altitudes (3,500m+), covering temperate to alpine zones only.
(c) Neora Valley National Park (West Bengal) — has some altitude variation but not the full tropical-to-arctic range.
Namdapha's uniquely low starting elevation combined with very high peaks gives it the complete tropical-to-arctic climate spread.
Namdapha National Park in Arunachal Pradesh has India's most complete climate range in one protected area, from 200m to over 4,500m elevation, creating tropical to arctic zones.
This altitude range makes Namdapha home to India's only ape (Hoolock Gibbon) and the world's only Namdapha flying squirrel, alongside temperate species like Red Panda and Snow Leopard.
The question tests understanding that climate zones in mountains depend on starting elevation plus peak height, not just peak height alone.
Namdapha National Park
Environment Namdapha National Park
Namdapha National Park: India's Multi-Climate Biodiversity Hotspot
Namdapha (Arunachal Pradesh) has India's widest altitude range: 200m to 4,500m creating tropical to arctic climate zones
Home to Hoolock Gibbon (India's only ape) and endemic Namdapha Flying Squirrel
Supports both tropical species (lower elevations) and alpine species like Snow Leopard (higher elevations)
Located in Changlang district, borders Myanmar with 1,985 sq km area
Why Namdapha is Unique
Namdapha National Park in Arunachal Pradesh is India's only protected area with a complete tropical-to-arctic climate spectrum. Its massive altitudinal range from 200 metres (lowest point) to over 4,500 metres (Dapha Bum peak) creates distinct climate zones within a single park — making it a living laboratory of India's biodiversity.
Climate Zones by Altitude
Altitude Range | Climate Zone | Vegetation Type | Key Species Examples |
|---|---|---|---|
200-1000m | Tropical | Tropical rainforests | Hoolock Gibbon, Hornbills |
1000-2000m | Subtropical | Mixed forests | Namdapha Flying Squirrel, Barking Deer |
2000-3500m | Temperate | Oak, rhododendron forests | Red Panda, Asiatic Black Bear |
3500-4500m+ | Alpine/Arctic | Alpine meadows, bare rocks | Snow Leopard, Blue Sheep |
Biodiversity Significance
Houses 96 mammal species — highest among Indian national parks
Namdapha Flying Squirrel found nowhere else in the world (endemic to this park)
Four big cat species coexist: Tiger, Leopard, Snow Leopard, and Clouded Leopard
Over 425 bird species including hornbills and pheasants
Serves as wildlife corridor between India and Myanmar
Park Location & Terrain
Map showing Namdapha National Park in Changlang district of Arunachal Pradesh, highlighting its location near Myanmar border and altitudinal variation from lowlands to peaks
Namdapha's strategic location in Changlang district creates a unique 200m to 4,500m altitude gradient
Question Context
This 2015 UPSC question tested knowledge of altitudinal biodiversity. Namdapha was the correct answer because its uniquely low starting elevation (200m) combined with very high peaks creates the complete climate spectrum that other mountain parks lack.
Don't confuse with Khangchendzonga — it has altitude variation but starts higher, missing true tropical zone
Nanda Devi is mostly high-altitude (3,500m+), covers only temperate to alpine zones
Neora Valley has some variation but not the full tropical-to-arctic range like Namdapha
Key trap: UPSC tests which park has the widest climate range, not just altitude variation
Mountain National Parks Comparison
Environment Khangchendzonga National Park Nandadevi National Park Neora Valley National Park
Khangchendzonga, Nanda Devi & Neora Valley: Climate Zones Comparison
Khangchendzonga (Sikkim): subtropical to alpine zones, starts at higher elevation than Namdapha
Nanda Devi (Uttarakhand): mainly temperate to alpine, 3,500m+ elevation range only
Neora Valley (West Bengal): limited altitude range, doesn't cover full climate spectrum
Mountain Parks Climate Comparison
National Park | State | Altitude Range | Climate Zones | Why Not Complete Spectrum |
|---|---|---|---|---|
Khangchendzonga | Sikkim | 1,220-8,586m | Subtropical to Alpine | Starts too high, misses tropical zone |
Nanda Devi | Uttarakhand | 3,500-7,816m | Temperate to Alpine | High altitude park, no tropical/subtropical |
Neora Valley | West Bengal | 183-3,200m | Tropical to Temperate | Doesn't reach alpine/arctic conditions |
Namdapha | Arunachal Pradesh | 200-4,500m | Tropical to Arctic | Complete spectrum — starts lowest, reaches sufficient height |
Key Distinguishing Features
Khangchendzonga: World's third-highest peak (8,586m), UNESCO World Heritage Site
Nanda Devi: Biosphere Reserve, core area around Nanda Devi peak (7,816m)
Neora Valley: Smallest among these four, known for Red Panda habitat
Namdapha: Only one with sea-level proximity creating true tropical base
All mountain parks have altitude variation — but only Namdapha covers all four climate zones
Don't assume highest peak = most climate diversity — starting elevation matters more
Khangchendzonga is highest but starts at 1,220m, missing the crucial tropical belt
UPSC often tests complete range vs partial range — memorize which park starts lowest
Altitude and Climate Zones
Geography
Altitudinal Climate Zonation: How Elevation Creates Climate Diversity
Temperature decreases by 6.5°C per 1000m altitude gain (normal lapse rate)
Four major zones: Tropical (0-1000m), Subtropical (1000-2000m), Temperate (2000-3500m), Alpine (3500m+)
Each zone supports distinct vegetation and wildlife communities
The Science Behind Climate Zones
As altitude increases, air pressure decreases and temperature drops at a predictable rate. This creates distinct climate belts up a mountain — like traveling from equator to poles vertically. Each belt develops unique ecosystems adapted to specific temperature and moisture conditions.
Climate Zone Formation
%%{init: {"flowchart": {"wrappingWidth": 460}}}%%
flowchart TD
s1["`**Sea Level (0m)**
**Tropical climate** — hot, humid, dense vegetation`"]
s2["`**1000m Altitude**
**Subtropical zone** — cooler, mixed forests begin`"]
s3["`**2000m Altitude**
**Temperate zone** — oak, pine forests, moderate temperatures`"]
s4["`**3500m+ Altitude**
**Alpine zone** — cold, sparse vegetation, snow-capped peaks`"]
s1 --> s2
s2 --> s3
s3 --> s4Climate Zones Characteristics
Zone | Altitude Range | Temperature Range | Typical Vegetation | Wildlife Adaptations |
|---|---|---|---|---|
Tropical | 0-1000m | 25-35°C | Rainforests, broad leaves | High metabolism, year-round activity |
Subtropical | 1000-2000m | 15-25°C | Mixed forests, bamboo | Seasonal behavior, mixed diets |
Temperate | 2000-3500m | 5-15°C | Coniferous forests, rhododendrons | Thick fur, hibernation patterns |
Alpine | 3500m+ | Below 5°C | Alpine meadows, cushion plants | Thick coats, reduced oxygen adaptation |
UPSC tests complete range — park must start near sea level AND reach high altitude
Starting elevation is crucial — high-altitude parks miss tropical zones entirely
Don't confuse highest peak with most climate diversity — range matters, not just height
6.5°C per 1000m temperature drop is standard — memorize this lapse rate