These natural vegetation notes for OPSC/UPSC (Part I) cover the types of forests in India, Himalayan vegetation zones, mangroves, forest cover data, and forest policy and laws. Prelims asks tree-to-forest-type matches, state-wise forest rankings and Acts, while mains uses the same material for deforestation, forest rights and climate answers. National parks, sanctuaries, biosphere reserves and the Wildlife Act are in Part II.
Natural Vegetation Notes for OPSC/UPSC: Basics and Classification
A plant community that has grown naturally, without human aid, and has been left undisturbed for a long time. Its type depends mainly on temperature and rainfall, with altitude, slope and soil as modifiers.
- India’s climate range, from over 1,000 cm rain in Meghalaya to under 20 cm in Rajasthan, gives it a very wide range of vegetation, from rainforest to desert scrub.
- The Western Ghats are the most biodiversity-rich region of the country. UPPSC 2019 India has four biodiversity hotspots: the Himalaya, Indo-Burma, the Western Ghats and Sri Lanka, and Sundaland (Nicobar Islands). The Eastern Ghats are not a hotspot, and the Western Ghats became a UNESCO World Heritage Site in 2012.
- Tropical rainforests are lush because of heat, rain and sunlight throughout the year, not because of fertile soil, which is leached and poor. NDA 2015
Champion and Seth classification
H. G. Champion proposed the first classification of Indian forest types in 1936, and Champion and Seth revised it in 1968 in A Revised Survey of the Forest Types of India. It groups forests into 16 major type groups, based on climate and vegetation, from tropical wet evergreen to alpine scrub.
Types of Forests in India
| Forest type | Rainfall | Typical trees | Where found |
|---|---|---|---|
| Tropical wet evergreen | Above 200 cm | Ebony, mahogany, rosewood, rubber | Western Ghats, Assam, Arunachal Pradesh, Mizoram, Andaman and Nicobar |
| Tropical semi-evergreen | Slightly lower, mixed | Mixture of evergreen and moist deciduous trees | Fringes of evergreen areas |
| Tropical moist deciduous | 100-200 cm | Teak, sal, shisham, sandalwood | Peninsular hills, east and north India, including Odisha |
| Tropical dry deciduous | 50-100 cm | Teak, sal (drier type), tendu, acacia | Largest forest type by area, across the plateau |
| Tropical thorn and arid | Below 50 cm | Babool, acacia, khejri, euphorbia | Rajasthan, Gujarat, rain-shadow Deccan, western Andhra Pradesh |
| Littoral and swamp (mangrove) | Tidal | Sundari, Rhizophora, Avicennia | Sundarbans, Bhitarkanika, Andamans, Godavari-Krishna deltas |
| Montane (Himalayan) | Varies with altitude | Chir, oak, rhododendron, deodar, fir, spruce | Himalaya |
IMAGE (Map): Natural vegetation map of India
Labels: Tropical wet evergreen, Semi-evergreen, Moist deciduous, Dry deciduous, Thorn and scrub, Montane, Mangrove, Western Ghats, Assam, Rajasthan, Sundarbans
Caption: Forest types of India follow the rainfall gradient from the south-west and north-east to the north-west.
Find it: NCERT Class 11 India Physical Environment, natural vegetation map; search Forest Survey of India forest type map
Tropical evergreen and rainforest
These forests have tall, closely set trees with a continuous canopy, a very large number of species and many epiphytes. UPSC 2013 Tropical wet evergreen forests occur in Arunachal Pradesh and Mizoram but not in Himachal Pradesh. UPSC 2015 Arunachal Pradesh has the largest area under dense evergreen forest. CAPF 2019 Tropical moist forests have the greatest diversity of plants and animals.
Deciduous forests: teak and sal
- Teak is the dominant tree of the tropical moist deciduous forest. UPSC 2015 It is the tree of the Western Ghats and Satpura, and sal is the typical tree of the east and north.
- Sal sheds most leaves in the dry season, and sal forests occur in both the moist and dry deciduous types. NDA 2016
- Tropical dry deciduous is the largest forest type in India. WBCS 2019 Madhya Pradesh has the largest area under dense deciduous forest. BPSC 2019
- Palash (Butea monosperma) is called the flame of the forest. RAS/RTS 2010
- Mahogany is a tropical evergreen species, not Himalayan. UPSC 2008
- Sandalwood is a peninsular tree, not Himalayan.
- Red sanders is endemic to the Eastern Ghats of Andhra Pradesh and grows in dry deciduous scrub, not in the rainforest. UPSC 2016
- Taxus yields taxol, an anti-cancer drug, not a drug for Parkinson’s disease. UPSC 2010
Thorn forest and a west-to-east transect
Thorn forests have open, stunted trees with long roots and thorns, and occur in rain-shadow areas such as western Andhra Pradesh. UPSC 2002 A traveller from Mangalore to Chennai passes tropical evergreen forest on the Western Ghats, moist deciduous forest, dry deciduous forest on the plateau, and tropical dry evergreen on the Tamil Nadu coast, because rainfall falls eastward.
Match questions pair trees with forest types: ebony with tropical evergreen, shisham with moist deciduous, walnut with Himalayan moist and birch with alpine. CDS 2011 Learn the rainfall bands too: above 200 cm, 100-200 cm, 50-100 cm and below 50 cm. CDS 2015
Himalayan Vegetation Zones
| Zone | Approx. altitude | Trees |
|---|---|---|
| Tropical and sub-tropical foothills | Up to about 1,500 m | Sal, teak, bamboo, shisham |
| Sub-tropical pine | About 1,000-2,000 m | Chir pine |
| Temperate | About 1,800-3,000 m | Oak, rhododendron, deodar (about 1,800-2,600 m), chestnut |
| Sub-alpine | About 3,000-3,600 m | Silver fir, spruce, cedar |
| Alpine | Above the tree line | Juniper, birch, alpine meadows |
- Oak and rhododendron are characteristic of temperate forest, and they grow naturally in the Himalayas. UKPSC 2016
- Spruce and cedar are trees of temperate forests. NDA 2016
- Deodar grows at a higher altitude than sal, teak or chir pine, at about 1,800-2,600 m. NDA 2018 UKPSC 2002
IMAGE (Diagram): Altitudinal zonation of Himalayan vegetation
Labels: Tropical foothills (sal), Sub-tropical (chir pine), Temperate (oak, deodar), Sub-alpine (fir, spruce), Alpine (juniper, birch), Tree line, Snow line, Altitude in metres
Caption: Vegetation changes with altitude in the Himalaya, from tropical to alpine.
Find it: NCERT Class 11 India Physical Environment, montane vegetation; search Himalayan vegetation zones diagram
Mangroves in India: Sundarbans and Bhitarkanika
Salt-tolerant forest ecosystems of tropical and sub-tropical sheltered coasts, found in the inter-tidal zone on muddy substrates with a mix of salt and fresh water.
- Adaptations: breathing roots (pneumatophores), stilt roots and viviparous germination of seeds on the parent tree.
- Distribution: the Sundarbans form the largest mangrove forest in the world, named after the sundari tree (Heritiera fomes). CGPSC 2011 Mangroves occur in all coastal states and in the Andaman and Nicobar Islands. CAPF 2018 Goa has a protected mangrove region.
- Role: they stabilise the shoreline and act as a bulwark against the sea. UPSC 1996 After the 2004 tsunami they were seen as a safety hedge because their extensive roots hold them in place against storms and tides. UPSC 2011
- Policy: the Mangrove Initiative for Shoreline Habitats and Tangible Incomes (MISHTI), announced in 2023, promotes mangrove plantation along the coast.
- Bhitarkanika is in Kendrapara district, Odisha, in the Brahmani-Baitarani delta, not in West Bengal and not in the Vansadhara or Subarnarekha delta. UP RO/ARO 2016
- Mangrove loss increases damage from cyclones, but it does not cause the cyclones.
IMAGE (Photo): Mangrove roots in an inter-tidal creek
Labels: Pneumatophores, Stilt roots, Mudflat, High tide line, Low tide line, Viviparous seedling
Caption: Mangrove roots anchor the tree in tidal mud and take in oxygen.
Find it: Wikimedia Commons Bhitarkanika mangroves; search Rhizophora stilt roots and Avicennia pneumatophores
Forest Cover of India: ISFR Data and State Rankings
The India State of Forest Report (ISFR) is published every two years by the Forest Survey of India, Dehradun. Forest cover counts all land of more than one hectare with canopy density of at least 10%. Classes are very dense (70% and above), moderately dense (40-70%) and open forest (10-40%). Scrub below 10% density is excluded.
- ISFR 2019 reported total forest and tree cover at 24.56% of India’s area. UP RO/ARO 2016 Forest cover alone is about 21-22%, and with tree cover India is still short of the 33% target.
- Madhya Pradesh has the largest forest cover in area. NDA 2017 Arunachal Pradesh has the largest area under very dense forest. UPPSC 2011 Mizoram has the highest forest percentage among the states. UP RO/ARO 2016
- By percentage of area, the ascending order of four central states is Maharashtra, Madhya Pradesh, Odisha, Chhattisgarh. UPSC 2019 Kerala, Odisha, Karnataka and Andhra Pradesh follow that descending order. NDA 2017
- The ranking of recorded forest area differs from forest cover, so read the question carefully. UPPSC 2011
| Ranking | States |
|---|---|
| Largest forest cover by area | Madhya Pradesh, then Arunachal Pradesh, then Chhattisgarh |
| Highest forest percentage | Mizoram, Arunachal Pradesh and other North-Eastern states such as Meghalaya, Manipur and Nagaland |
| Very low forest percentage | Haryana, Punjab |
Forest Policy and Laws in India
| Year | Law or policy | Key point |
|---|---|---|
| 1865, 1878 | Indian Forest Acts | The 1878 Act divided forests into reserved, protected and village forests CAPF 2019 |
| 1927 | Indian Forest Act | Consolidated forest law, still in force |
| 1952, 1988 | National Forest Policy | 1988 policy: 33% of the area under forest and tree cover and 66% in hills and mountains UPPSC 2002 |
| 1972 | Wildlife (Protection) Act | Covered in Part II |
| 1980 | Forest (Conservation) Act | Central approval to divert forest land; amended in 2023 UPPSC 2017 |
| 2006 | Forest Rights Act | Recognises rights of Scheduled Tribes and other traditional forest dwellers |
| 2016 | Compensatory Afforestation Fund Act | Funds compensatory afforestation (CAMPA) |
- Green India Mission: one of the eight missions under the National Action Plan on Climate Change, aimed at improving forest quality and tree cover.
- Social forestry: raising trees with community participation to meet local needs. The National Commission on Agriculture (1976) promoted it, with farm, community and extension forestry as its forms.
- Joint Forest Management: local committees share protection duties and benefits. Odisha was among the first states with a JFM resolution (1988).
People’s movements and forest governance
- Chipko (1973): villagers in Chamoli, now in Uttarakhand, hugged trees to stop felling. UPPSC 2012
- Appiko (1983): a similar movement in Karnataka’s Western Ghats.
- Apna Van Apna Dhan: a Himachal Pradesh scheme for community forestry. UPPSC 2012
- Bhutan has about 70% forest cover and a constitutional pledge to keep at least 60% under forest. UPPSC Mains 2016
Deforestation: Causes, Impacts and Solutions
- Causes: agricultural expansion, shifting cultivation, mining, dams and roads, urbanisation, fuelwood demand and fires.
- Shifting cultivation: clearing and burning vegetation, abandoning the plot when fertility falls. It is Jhum in the North-East and Podu in Odisha. Short fallow periods have made Nagaland’s hills barren. MPPSC 2010
- Impacts: drying of Himalayan springs, loss of biodiversity and soil erosion. Urbanisation is a cause, not an impact. MPPSC 2013
- Population growth is linked to forest loss, and forests are a renewable resource only when used sustainably. UP RO/ARO 2016
Mains analysis points
- Forests as a carbon sink: India’s 2015 climate pledge included creating an additional carbon sink of 2.5 to 3 billion tonnes of CO2 equivalent by 2030 through forest and tree cover.
- Balancing development and conservation: debate over the 2023 amendment to the Forest (Conservation) Act and diversion of forest land for mining and infrastructure.
- Rights of forest dwellers under FRA 2006 against displacement, and Gram Sabha consent.
- Tree cover outside forests, agroforestry and urban forests as ways to approach the 33% target.
- Forest fires, invasive species and human-wildlife conflict as new pressures on forest quality.
Likely mains framings: examine the causes and consequences of deforestation in India; discuss the role of community participation in forest management; evaluate the Forest Rights Act, 2006; explain why mangroves matter for coastal protection.
Natural Vegetation in Odisha: Sal Forests, Mangroves and Forest Rights
- Forest types: Odisha’s forests are mainly tropical moist and dry deciduous, with sal as the typical tree. Odisha has about one-third of its area under forest, below Chhattisgarh but above Madhya Pradesh and Maharashtra by percentage. UPSC 2019
- Mangroves: Bhitarkanika, in the Brahmani-Baitarani delta, is the second largest mangrove ecosystem in India and a Ramsar site since 2002. Cyclone-prone coastal Odisha depends on mangroves for protection against surge. UPPSC 2010
- Forest rights: in 2013 the Gram Sabhas of the Niyamgiri hills rejected a bauxite mining proposal after a Supreme Court direction. The Dongria Kondh live there. This is the landmark example of Gram Sabha power under FRA.
- Community forestry: Odisha adopted a Joint Forest Management resolution in 1988 and runs Vana Samrakshan Samitis.
- Shifting cultivation: Podu cultivation by tribal communities on hill slopes is a land-use and rights issue in Odisha.
- Kendu leaf: Odisha is a major producer of kendu (tendu) leaves, the leaves used for bidis, and trade is state-controlled, giving income to forest communities.
The Niyamgiri case shows how FRA 2006 turns the Gram Sabha into the decision-maker on forest land: the Supreme Court directed that the Gram Sabhas decide on religious and cultural rights, and the 2013 votes ended the proposed mining.
Natural Vegetation Practice Questions and PYQs
In India, in which one of the following types of forests is teak a dominant tree species?
- Tropical Moist Deciduous Forest
- Tropical Rain Forest
- Tropical Thorn Scrub Forest
- Temperate Forest with Grasslands
Show answer
(a) - teak dominates the moist deciduous forests of about 100-200 cm rainfall. UPSC 2015
Consider the following states: I. Arunachal Pradesh II. Himachal Pradesh III. Mizoram. In which of the above States do ‘Tropical Wet Evergreen Forest’ occur?
- Only I
- II and III only
- I and III only
- I, II and III
Show answer
(c) - Arunachal Pradesh and Mizoram have wet evergreen forest, while Himachal Pradesh has temperate and pine forests. UPSC 2015
Consider the following statements. I. The Taxus tree is naturally found in the Himalayas. II. The Taxus tree is listed in the Red Data Book. III. A drug called ‘taxol’ is obtained from the Taxus tree which is effective against Parkinson’s disease. Which of the statements given above is/are correct?
- Only I
- I and II
- II and III
- I, II and III
Show answer
(b) - taxol is an anti-cancer drug, so III is wrong. UPSC 2010
With reference to ‘Red Sanders’ sometimes seen in the news, which of the following statements is/are correct? I. It is a tree species found in a part of South India. II. It is one of the most important trees in the Tropical Rainforest areas of South India.
- Only I
- Only II
- Both I and II
- Neither I nor II
Show answer
(a) - it is endemic to the Eastern Ghats of Andhra Pradesh and grows in dry scrub forest, not rainforest. UPSC 2016
With reference to the States Chhattisgarh, Madhya Pradesh, Maharashtra and Odisha, in terms of percentage of forest cover to the total area of the State, which one is the correct ascending order?
- Madhya Pradesh, Maharashtra, Chhattisgarh, Odisha
- Madhya Pradesh, Maharashtra, Odisha, Chhattisgarh
- Maharashtra, Madhya Pradesh, Odisha, Chhattisgarh
- Maharashtra, Madhya Pradesh, Chhattisgarh, Odisha
Show answer
(c) - Maharashtra is lowest, then Madhya Pradesh, Odisha and Chhattisgarh. UPSC 2019
The 2004 Tsunami made people realize that mangroves can serve as a reliable safety hedge against coastal calamities. How do mangroves function as a safety hedge?
- The mangrove swamps separate the human settlements from the sea by a wide zone in which people neither live nor venture out.
- The mangroves provide both food and medicines which people are in need of after any natural disaster.
- The mangrove trees are tall with dense canopies and serve as an excellent shelter during a cyclone or tsunami.
- The mangrove trees do not get uprooted by storms and tides because of their extensive roots.
Show answer
(d) - their extensive roots anchor them against storms and tides. UPSC 2011
Which one of the following Forest Acts divided forests of India into reserved, protected and village forests?
- Forest Act, 1864
- Forest Act, 1865
- Forest Act, 1866
- Forest Act, 1878
Show answer
(d) - the 1878 Act introduced the three classes. CAPF 2019
Consider the following statements about Bhitarkanika: 1. The mangroves lie in the Brahmani-Baitarani delta in Kendrapara district, Odisha. 2. It is the second largest mangrove ecosystem in India after the Sundarbans. 3. It is a Ramsar site. How many of the statements are correct?
- Only one
- Only two
- All three
- None
Show answer
(c) - all three statements are correct, and the site was designated in 2002.