1. Importance of forests
- Natural vegetation: plant cover that grows without being planted by people.
- Ecological: oxygen and carbon dioxide balance; moderate temperature and add moisture (help rainfall); roots bind soil, litter slows runoff (less erosion, smaller floods); groundwater recharge; habitat and biodiversity; humus.
- Economic: timber, fuelwood, fodder; raw material for paper, plywood, matches, rayon; minor products (lac, gum, resin, honey, cane, tendu leaves, medicinal plants); tribal livelihoods; tourism.
| Ecological | Economic |
|---|---|
| Check erosion and floods | Timber and fuelwood |
| Recharge groundwater | Industrial raw materials |
| Wildlife habitat | Minor forest products |
Key terms
- Natural vegetation
Plant cover that grows on its own, without human planting.
- Minor forest products
Forest products other than timber, such as lac, gum, honey, cane and tendu leaves.
2. Tropical evergreen forests
- Climate: over 200 cm rain; hot and humid all year.
- Distribution: western slopes of the Western Ghats; north-eastern hills; Andaman and Nicobar Islands.
- Features: very dense; several storeys; tall trees; leaves shed at different times (green all year); many species mixed; climbers and undergrowth.
- Trees: ebony, mahogany, rosewood, rubber, cinchona; bamboo and canes.
- Exploitation is difficult: mixed stands, dense growth, hilly remote land, heavy logs.
| Feature | Linked to |
|---|---|
| Dense, storeyed | Heavy rain, constant warmth |
| Green all year | No marked dry season |
| Hard to log | Mixed species, terrain |
Key terms
- Evergreen
Never bare of leaves as a whole, because trees shed leaves at different times.
3. Tropical deciduous (monsoon) forests
- Leaf fall: trees shed leaves for 6–8 weeks in the dry summer to reduce water loss.
- Moist deciduous (100–200 cm): north-east along the foothills, Jharkhand, Odisha, Chhattisgarh, eastern slopes of the Western Ghats; teak, sal, shisham, sandalwood, bamboo, khair, arjun.
- Dry deciduous (70–100 cm): drier plateau, plains of Bihar and Uttar Pradesh; teak, sal, peepal, neem; open with grass.
- Most important commercially: large area, valuable timber, fairly pure stands, easier access.
| Tree | Use |
|---|---|
| Teak | Furniture, doors, boats |
| Sal | Railway sleepers, building |
| Sandalwood | Carving, perfume oil |
| Bamboo | Paper pulp, building |
| Type | Rainfall | Trees |
|---|---|---|
| Moist deciduous | 100–200 cm | Teak, sal, sandalwood |
| Dry deciduous | 70–100 cm | Teak, peepal, neem |
Key terms
- Monsoon forests
Another name for tropical deciduous forests, which shed their leaves in the dry season.
4. Tropical desert and littoral vegetation
- Desert (thorn): under 70 cm; western Rajasthan, Kutch, Saurashtra, south-west Punjab and Haryana; long roots, small thorny or waxy leaves, fleshy stems; babul, khejri, kikar, ber, cacti, euphorbias.
- Littoral (tidal) or mangrove: deltas of the Ganga–Brahmaputra (Sundarbans), Mahanadi, Godavari, Krishna, Kaveri; Andaman and Nicobar; salt-tolerant; stilt roots for support; breathing roots (pneumatophores) for air; sundari (boat timber), keora, agar, nipa.
- Mangroves protect coasts from storm waves, trap silt and shelter fish and wildlife.
| Vegetation | Adaptation |
|---|---|
| Desert | Deep roots, small leaves |
| Mangrove | Salt tolerance, breathing roots |
Key terms
- Pneumatophores
Breathing roots that grow upward from the mud and take in air at low tide.
- Littoral forest
Forest of tidal coasts and deltas, mainly mangroves.
5. Mountain vegetation
- Temperature falls with altitude (about 6.5 °C per 1000 m), so vegetation changes in belts.
- Foothills: tropical moist deciduous (sal).
- About 1000–2000 m: wet temperate — oak, chestnut.
- About 2000–3000 m: temperate coniferous — pine, deodar, spruce, silver fir, cedar.
- About 3000–3600 m: alpine — silver fir, juniper, birch, rhododendron.
- Above about 3600 m: alpine meadows (summer grazing); mosses and lichens; then snow.
- Altitudes are approximate and vary from east to west.
| Approx. altitude | Vegetation |
|---|---|
| Below 1000 m | Sal |
| 1000–2000 m | Oak, chestnut |
| 2000–3000 m | Pine, deodar |
| Above 3600 m | Meadows |
Key terms
- Coniferous trees
Cone-bearing trees with needle-shaped leaves, such as pine and deodar.
- Alpine meadows
High grasslands above the tree line, used for summer grazing.
6. Forest conservation
- Threats: clearing for farms, roads, dams, mines and towns; overgrazing; fuelwood; fires; shifting cultivation.
- Afforestation: trees on land without forest (wasteland, dunes).
- Reforestation: replanting where forest was cut or burnt.
- Social forestry: trees on public and community land (roadsides, canal banks, village commons) for local fuel, fodder and small timber.
- Agroforestry: trees grown with crops on the same farmland.
- Van Mahotsav: tree-planting festival started in 1950, held every year in the first week of July; aim — awareness of the value of trees and planting saplings.
| Pair | Difference |
|---|---|
| Afforestation / reforestation | New forest / restored forest |
| Social forestry / agroforestry | Public land / private farmland |
Key terms
- Afforestation
Planting trees on land that has not carried forest.
- Reforestation
Replanting trees on land where forest has been cut or destroyed.
- Social forestry
Tree planting on public and community land to meet local needs, with people’s participation.
- Agroforestry
Growing trees together with crops on the same farmland.
Exam tips
Common mistakes
- Saying evergreen trees never shed leaves.
- Calling teak or sal evergreen trees.
- Explaining mountain belts by rainfall instead of temperature.
- Mixing up social forestry (public land) and agroforestry (farmland).
How marks are usually awarded
- Forest types: climate, distribution, features, trees with uses (1 mark per correct point with a named area).
- Adaptations: feature plus how it helps.
- Conservation terms: one clear difference, with an example.