Natural Vegetation

Why this chapter matters for UPSC: This is Chapter 5 (Unit III, "Climate and Vegetation") of India — Physical Environment in the current rationalised NCERT (Reprint 2026-27). It classifies India's forests by rainfall, temperature and altitude, then covers forest conservation, social forestry, wildlife protection, biosphere reserves, Project Tiger and Project Elephant. Mains GS1 has asked about the diversity of natural vegetation (2023), the status of forest resources (2020) and mangroves (2019); Prelims 2026 asked about Madhav Tiger Reserve and about mangroves.

Contemporary hook: On 27 September 2025 UNESCO added the Cold Desert Biosphere Reserve (Himachal Pradesh) to its World Network of Biosphere Reserves, so 13 of India's 18 biosphere reserves are now on the network; the NCERT reprint still says twelve. India's first DNA-based elephant estimation (SAIEE 2021–25) put the wild elephant population at 22,446 (released by WII, October 2025). The India State of Forest Report 2023 (released 21 December 2024) is still the latest forest-cover assessment cited by the Environment Ministry in Parliament (Lok Sabha answer, 20 July 2026).

🧠 First Principles — Read This First

NCERT defines natural vegetation as a plant community that has been left undisturbed over a long time, so that its species have adjusted as fully as possible to the local climate and soil. A mango orchard or a city park is planted vegetation; the same tree growing wild in a forest is natural vegetation.

The main control is water. Where rain is heavy and there is no long dry season, trees keep their leaves all year and the forest is evergreen. Where a dry season of several months follows the monsoon, trees shed their leaves to cut water loss, and the forest is deciduous. Where rain is scarce, the land carries thorny bushes, grasses and scattered trees. You can see the same pattern on a smaller scale in a garden: plants watered daily stay green, and plants left dry through summer drop their leaves or wilt.

Temperature adds a second control, through altitude. Climbing a mountain lowers the temperature, so the Himalaya carries tropical forest at its foothills, temperate forest higher up, alpine pastures above that, and mosses and lichens near the snow.

The second half of the chapter is about protecting what grows. India adopted a forest policy in 1952 and revised it in 1988 with a target of one-third of the area under forest. It protects wildlife through the Wildlife (Protection) Act, 1972, national parks and sanctuaries, biosphere reserves, and species projects such as Project Tiger (1973) and Project Elephant (1992).

UPSC asks about this chapter because each forest type has a fixed rainfall band and species list that make good Prelims statements, and because forest cover, mangroves and protected areas carry dated official numbers.

PART 1 — Quick Reference

Table 1: Forest Types of India (NCERT)

Tropical deciduous forests, also called monsoon forests, are the most widespread forests in India and cover the 70–200 cm band. Source: NCERT, India — Physical Environment, Ch. 5 "Natural Vegetation", Reprint 2026-27, pp. 42–46 (kegy105.pdf).

Table 2: Montane Forests (NCERT)

The south-facing slopes of the Himalaya carry thicker vegetation than the drier north-facing slopes because they receive more precipitation. Source: NCERT kegy105, p. 45.

Table 3: Forest and Tree Cover (ISFR 2023)

Other ISFR 2023 findings: largest forest cover by area in Madhya Pradesh (77,073 km²), Arunachal Pradesh (65,882 km²) and Chhattisgarh (55,812 km²). By share of area, Lakshadweep (91.33%), Mizoram (85.34%) and the Andaman and Nicobar Islands (81.62%) lead. 19 states/UTs have more than 33% of their area under forest cover. Carbon stock in forests is 7,285.5 million tonnes. The additional carbon sink over the 2005 base year has reached 2.29 billion tonnes of CO₂ equivalent, against the NDC target of 2.5–3.0 billion tonnes by 2030.

The breakdown of forest cover into density classes (very dense, moderately dense, open) is not given here because it could not be checked against an official source for this revision.

Sources: PIB, "Union Minister Bhupender Yadav Releases India State of Forest Report 2023", 21 December 2024; PIB, Rajya Sabha answer "Steps to increase forest cover", 24 July 2025 (exact figures); PIB, Lok Sabha answer "Mangrove Conservation", 21 July 2025.

Table 4: Mangrove Cover by State/UT (ISFR 2019 and ISFR 2023)

The total rose by 16.68 km² between ISFR 2019 and ISFR 2023. Derived from the table (arithmetic, not published as such): West Bengal holds about 42.5% of India's mangrove cover and Gujarat about 23.3%. Source: PIB, Lok Sabha answer "Mangrove Conservation", 21 July 2025.

Table 5: Conservation Network — Dated Official Counts

Table 6: Biosphere Reserves of India (NCERT Table 5.1)

NCERT's table cites the MoEFCC Annual Report 2024-25. PIB (3 November 2025) adds: largest is the Great Rann of Kutch (12,454 km²), smallest is Nokrek (820 km²), oldest is Nilgiri (1986), newest is Panna (2011), and Madhya Pradesh and Tamil Nadu have three each. Sources: NCERT kegy105, p. 48; PIB backgrounder, 3 November 2025.

PART 2 — Concepts & Narrative

Tropical Evergreen and Semi-Evergreen Forests

These forests grow in warm, humid areas with more than 200 cm of rain and a mean annual temperature above 22 °C. They are well stratified: shrubs and creepers near the ground, then short trees, then tall trees that reach 60 m or more. There is no fixed season for shedding leaves, flowering or fruiting, so the forest looks green all year. Semi-evergreen forests grow in the less rainy parts of the same regions and mix evergreen with moist deciduous trees; climbers in the undergrowth give them their evergreen look.

Colonial change. NCERT notes that the British exploited these forests commercially and changed their structure. Oak forests in Garhwal and Kumaon were replaced by chir pine, which was needed for laying railway lines. Forests were cleared for tea, rubber and coffee plantations, and timber was used in construction. Protective use of forests gave way to commercial use.

Tropical Deciduous Forests

These are the most widespread forests in India and are also called monsoon forests. They cover areas with 70–200 cm of rain and are divided by water availability:

• Moist deciduous (100–200 cm): northeastern states along the Himalayan foothills, the eastern slopes of the Western Ghats, and Odisha.
• Dry deciduous (70–100 cm): large parts of the country, grading into moist deciduous forest on the wetter margins and into thorn forest on the drier ones. In the rainier parts of the Peninsular plateau and the north Indian plain they form a parkland landscape: open stretches where teak and other trees are scattered among patches of grass. When the dry season begins the trees shed all their leaves and the forest looks like a grassland with bare trees. In western and southern Rajasthan the cover is very scanty because of low rainfall and overgrazing.

Tropical Thorn Forests

Below 50 cm of rain the vegetation becomes grasses and shrubs, with plants leafless for most of the year so that the whole looks like scrub.

Montane Forests

Temperature falls with altitude, and vegetation changes with it. NCERT divides mountain forests into northern (Himalayan) and southern (Peninsular) types; Table 2 gives the zones. Two points beyond the table:

• The Himalaya shows a succession from tropical to tundra vegetation over a short horizontal distance. Grazing in the 3,000–4,000 m pastures follows transhumance: the Gujjars, Bakarwals, Bhotiyas and Gaddis move their herds to high pastures in summer and down in winter.
• The southern mountain forests stand only about 1,500 m high and lie close to the tropics. They are temperate only in their higher parts. That is why the Sholas of the Nilgiri, Anaimalai and Palani hills are patches of temperate forest within a tropical region.

Littoral and Swamp Forests: Wetlands and Mangroves

Wetlands. NCERT puts India's wetland area at 3.9 million hectares, about 70% of it under paddy cultivation. It names Chilika Lake (Odisha) and Keoladeo National Park (Bharatpur) as water-fowl habitats protected under the Ramsar Convention. (India had 98 Ramsar sites on 31 January 2026 (PIB, 7 April 2026) and 101 on 3 August 2026, when Glaw Lake in Arunachal Pradesh was designated (All India Radio).) NCERT groups the wetlands into eight categories:

1. Reservoirs of the Deccan Plateau, with the lagoons and other wetlands of the southern west coast
2. Saline expanses of Rajasthan, Gujarat and the Gulf of Kachchh
3. Freshwater lakes and reservoirs from Gujarat eastwards through Rajasthan (Keoladeo) and Madhya Pradesh
4. Delta wetlands and lagoons of the east coast (Chilika)
5. Freshwater marshes of the Gangetic plain
6. Floodplains of the Brahmaputra, and marshes and swamps in the hills of the northeast and the Himalayan foothills
7. Lakes and rivers of the montane region of Kashmir and Ladakh
8. Mangrove forests and other wetlands of the Andaman and Nicobar island arcs

Mangroves. Mangroves grow along coasts in salt marshes, tidal creeks, mud flats and estuaries. They consist of salt-tolerant plants, are crossed by creeks of stagnant water and tidal flows, and shelter many birds. NCERT gives India's mangrove area as 4,992 km², which it says is 7% of the world's mangrove forests. They are best developed in the Andaman and Nicobar Islands and the Sundarbans of West Bengal, with other significant areas in the Mahanadi, Godavari and Krishna deltas. NCERT notes that they are being encroached upon and need conservation.

ISFR 2023 gives the same total, 4,991.68 km² (Table 4). By state, West Bengal ranks first and Gujarat second, ahead of the Andaman and Nicobar Islands. NCERT's description says where mangroves are best developed; it does not rank states by area, so the two sources do not conflict. Regulation: the Coastal Regulation Zone Notification, 2019 classes mangroves as Ecologically Sensitive Areas and allows only very limited activities in them. Restoration is promoted through MISHTI (Mangrove Initiative for Shoreline Habitats & Tangible Incomes), launched on 5 June 2023 (PIB, 21 July 2025).

Forest Conservation and Forest Policy

India adopted a forest policy in 1952 and modified it in 1988. The 1988 policy emphasises sustainable forest management: conserving and expanding forests while meeting the needs of local people. NCERT lists its aims:

1. Bring 33% of the geographical area under forest cover
2. Maintain environmental stability and restore forests where the ecological balance was disturbed
3. Conserve the natural heritage, biological diversity and genetic pool
4. Check soil erosion, the extension of desert lands, and floods and droughts
5. Increase forest cover through social forestry and afforestation on degraded land
6. Raise forest productivity to make timber, fuel, fodder and food available to forest-dependent rural people, and encourage substitutes for wood
7. Build a mass people's movement, involving women, to plant trees, stop felling and reduce pressure on existing forests

ISFR 2023 puts forest cover at 21.76% and forest plus tree cover at 25.17% (Table 3), against the 33% aim.

Forests and tribal life. NCERT's box describes the forest as home, livelihood and existence for many tribal people: food, fruit, edible leaves, honey, roots, game, and material for houses and crafts. It argues that tribal forest knowledge should be used in forest development, and that tribal people should be made growers of minor forest produce and partners in conservation rather than only collectors.

Social forestry. Social forestry means managing and protecting forests and afforesting barren land to help environmental, social and rural development. The National Commission on Agriculture (1976) classified it into three categories:

• Urban forestry: raising and managing trees on public and private land in and around towns, such as green belts, parks, roadside avenues, and industrial and commercial green belts.
• Rural forestry: promotes agro-forestry and community forestry. Agro-forestry raises trees and crops on the same land, including waste patches, to produce food, fodder, fuel, timber and fruit together. Community forestry raises trees on public or community land such as village pastures, temple land, roadsides, canal banks, railway strips and schools, so that landless people can share in the benefits.
• Farm forestry: farmers grow trees on their own farm land for commercial and non-commercial purposes. State forest departments distribute seedlings free to small and medium farmers, and field margins, grasslands, pastures and land around homes and cattle sheds can be planted.

Wildlife and Its Decline

NCERT estimates that about 4–5% of all known plant and animal species on earth are found in India, owing to the great diversity of its ecosystems. It lists six reasons for the decline of wildlife:

1. Industrial and technological advance increased the exploitation of forest resources.
2. Land was cleared for agriculture, settlements, roads, mining and reservoirs.
3. Lopping for fodder and fuelwood and removal of small timber put pressure on forests.
4. Grazing by domestic cattle harmed wildlife and its habitat.
5. Hunting as a sport by the elite killed hundreds of animals in a single hunt; commercial poaching is now rampant.
6. Forest fires.

Wildlife Conservation in India

The Wildlife (Protection) Act, 1972 is the main legal framework. NCERT gives its two aims: to protect the endangered species listed in its schedules, and to give legal support to conservation areas classified as national parks, sanctuaries and closed areas. It was comprehensively amended in 1991, with harsher punishments and protection for specified plant species. It was amended again in December 2022 (PIB, 3 March 2025).

NCERT counts 107 national parks and 573 wildlife sanctuaries. The WII National Wildlife Database figure as of 27 November 2023 is 106 national parks and 573 sanctuaries (Table 5).

Biosphere Reserves

A biosphere reserve is a unique and representative terrestrial or coastal ecosystem that is internationally recognised under UNESCO's Man and Biosphere (MAB) Programme. India has 18 (Table 6). Biosphere reserves are nominated by national governments and stay under national jurisdiction. Each has a strictly protected core, surrounded by buffer and transition zones where communities live and use resources (PIB, 3 November 2025). NCERT says twelve Indian reserves are on UNESCO's World Network. The Cold Desert Biosphere Reserve was added at the 37th session of the MAB International Coordinating Council on 27 September 2025, which makes thirteen (PIB, 27 September 2025). UNESCO's June 2026 round of 14 new reserves included no Indian site.

Project Tiger and Project Elephant

Project Tiger has been implemented since 1973. Its aim is to maintain a viable tiger population for scientific, aesthetic, cultural and ecological values, and to preserve areas of biological importance as natural heritage. NCERT: it began with nine tiger reserves covering 16,339 km² and now has 58 reserves with 84,487 km² of core tiger habitat in 18 states. Tiger numbers rose from 1,411 in 2006 to 3,682.

Official figures differ in places. PIB's report on the 2022 estimation (29 July 2023) gives the original nine reserves as 18,278 km², not NCERT's 16,339 km². India's share of the world's wild tigers is "more than 75 per cent" in NCERT, "almost 75%" in PIB (29 July 2023) and "nearly 70%" in PIB (28 July 2026). All three rest on the same Indian estimate from 2022; quote the share with its source and date. The figure of 3,167 announced at the Project Tiger golden-jubilee event in Mysuru (April 2023) was the minimum count from camera-trapped areas; the published average after further analysis is 3,682.

Project Elephant was launched in 1992 to help states with free-ranging wild elephants and to ensure the long-term survival of viable elephant populations in their natural habitat. NCERT says it is implemented in 18 states. PIB (12 August 2026) gives 33 elephant reserves across 14 states, 150 identified elephant corridors, and a wild population of 22,446 (SAIEE 2021–25), about 60% of the world's wild Asian elephants.

NCERT also names the Crocodile Breeding Project, Project Hangul and the conservation of the Himalayan musk deer.

PART 3 — UPSC Integration

Rainfall–Vegetation Ladder (NCERT bands)

NCERT does not assign a separate type to 50–70 cm. Dry deciduous forest grades into thorn forest on its drier margins.

Frames for Mains Answers

• Diversity of vegetation (gs1-pyq-2023-17): rainfall and dry-season length (Table 1), altitude (Table 2), relief and slope aspect (south-facing Himalayan slopes thicker), soil and coast (mangroves, wetlands), and human history (oak replaced by chir pine; plantations).
• Status of forests (gs1-pyq-2020-17): ISFR 2023 cover against the 33% policy aim; forest cover vs recorded forest area; carbon stock and the 2.29 billion tonne sink against the 2.5–3.0 billion tonne NDC target.
• Mangroves (gs1-pyq-2019-08): distribution (Table 4), legal protection (CRZ 2019), restoration (MISHTI), the gain of 16.68 km² from 2019 to 2023 alongside falls in Gujarat, the Andaman and Nicobar Islands, Maharashtra and Tamil Nadu.

Exam Strategy

Prelims fact-traps:

• Thorn forest is below 50 cm in NCERT, not 70 cm.
• Evergreen forest needs a mean annual temperature above 22 °C as well as over 200 cm of rain.
• Semi-evergreen species are white cedar, hollock and kail, not teak.
• Sal and shisham are moist deciduous. Dry deciduous species are tendu, palas, amaltas, bel, khair and axlewood.
• Sandalwood is listed under moist deciduous forest (NCERT exercise 1(i)).
• Wet temperate oak–chestnut forest is at 1,000–2,000 m; chir pine at 1,500–1,750 m; blue pine and spruce at 2,225–3,048 m.
• Sholas are in the Nilgiri, Anaimalai and Palani hills.
• Gujarat is second in mangrove cover (1,164.06 km², ISFR 2023), not a minor state.
• UNESCO-listed biosphere reserves: 13 since 27 September 2025 (Cold Desert); NCERT says 12.
• National parks: 106 (WII, 27 November 2023) vs 107 in NCERT.
• Hotspots: four of 36 (Himalaya, Western Ghats, Indo-Burma, Sundaland).
• Forest Policy target: 33% (1952 policy, modified 1988).
• Project Tiger 1973; Project Elephant 1992; Wildlife (Protection) Act 1972 (amended 1991, 2022).

Mains patterns in the bank: the 2023 question pairs the causes of vegetation diversity with the value of sanctuaries in rain forests; the 2019 question pairs causes of mangrove loss with their coastal role; the 2020 question links forest status to climate change. Each asks for distribution plus a reason, supported by a dated figure.

Practice Questions

1. UPSC CSE Mains 2023, GS Paper I (gs1-pyq-2023-17), 15 marks: "Identify and discuss the factors responsible for diversity of natural vegetation in India. Assess the significance of wildlife sanctuaries in rain forest regions of India."
2. UPSC CSE Mains 2019, GS Paper I (gs1-pyq-2019-08), 10 marks: "Discuss the causes of depletion of mangroves and explain their importance in maintaining coastal ecology."
3. UPSC CSE Mains 2020, GS Paper I (gs1-pyq-2020-17), 15 marks: "Examine the status of forest resources of India and its resultant impact on climate change."
4. UPSC CSE Prelims 2026, GS Paper I (prelims-2026-gs1-022): With reference to Madhav National Park, which of the following statements is/are correct? (1) It was declared a Tiger Reserve in India in 2025. (2) Sakhya Sagar, which is designated as a Ramsar Site, is situated within this National Park. (3) Its area is shared between Madhya Pradesh and Rajasthan. (a) 1 only (b) 1 and 2 (c) 2 and 3 (d) 3 only. Answer: (b).
5. Practice (UPSC-pattern, not a past paper): Match the forest type with its NCERT rainfall band and one species: tropical thorn, tropical dry deciduous, tropical moist deciduous, tropical evergreen. (Under 50 cm, khejri; 70–100 cm, tendu; 100–200 cm, sal; over 200 cm, ebony.)

📦 Revision Capsule

Sources

Sources

• NCERT, India — Physical Environment, Textbook in Geography for Class XI, Chapter 5 "Natural Vegetation", rationalised edition, Reprint 2026-27 — kegy105.pdf.
• PIB, "Union Minister Bhupender Yadav Releases India State of Forest Report 2023", 21 December 2024 — PIB.
• PIB, Parliament Question "Steps to increase forest cover" (Rajya Sabha), 24 July 2025 — PIB.
• PIB, Parliament Question "Mangrove Conservation" (Lok Sabha), 21 July 2025 — PIB.
• PIB, Parliamentary Question "Conservation of the Sundarbans Mangrove Ecosystem" (Lok Sabha), 11 August 2025 — PIB.
• PIB, Parliament Question "India State of Forest Report" (Rajya Sabha; definition of forest cover), 12 December 2024 — PIB.
• Lok Sabha Unstarred Question No. 126, "Development on Forest Land", answered 20 July 2026 — Lok Sabha PDF.
• PIB Backgrounder, "India's Expanding Green Footprint" (FAO GFRA 2025), 24 October 2025 — PIB.
• PIB, "India's Wildlife Conservation Milestones", 3 March 2025 — PIB.
• PIB, Parliament Question "Wildlife and Animal Conservation Initiatives" (Rajya Sabha), 5 February 2026 — PIB.
• PIB, "India's Cold Desert Biosphere Reserve in Himachal Pradesh included in UNESCO's World Network of Biosphere Reserves", 27 September 2025 — PIB.
• PIB Backgrounder, "Sustaining Life, Celebrating Nature: India's Biosphere Reserves", 3 November 2025 — PIB.
• UNESCO, "UNESCO designates 14 new biosphere reserves on World Environment Day" (2026) — UNESCO.
• PIB, "All India Tiger Estimation-2022: Release of the detailed Report", 29 July 2023 — PIB.
• PIB Backgrounder, "India Leads the Wilderness in Tiger Conservation", 28 July 2026 — PIB.
• PIB Backgrounder, "World Elephant Day", 12 August 2026 — PIB.
• Wildlife Institute of India, "Status of Elephants in India: DNA based Synchronous All India Population Estimation of Elephants (SAIEE) 2021-2025", 14 October 2025 — WII.
• All India Radio, "Glaw lake of Arunachal Pradesh designated as 101st Ramsar site; first from the state", 3 August 2026 — newsonair.gov.in.
• PIB Backgrounder, "India's Green Pathway", 7 April 2026 (Ramsar sites, protected areas) — PIB.
• PIB, MoS Environment at the IUCN World Conservation Congress (four of 36 hotspots), 9 October 2025 — PIB.
• PIB, "Lok Sabha passes the Forest (Conservation) Amendment Bill 2023" — PIB.
• PIB (Ministry of Tribal Affairs), "Implementation of Forest Rights Act, 2006", Lok Sabha answer, 24 July 2025 — PIB.
• Mains PYQ texts: BharatNotes Mains GS1 and GS3 question banks (UPSC CSE Mains 2018, 2019, 2020, 2023); Prelims: BharatNotes Prelims 2026 GS1 bank.