Key Points
Key Points: Introduction of Natural Vegetation
- Natural vegetation refers to plants that grow naturally without human help and remain undisturbed for a long time.
- It includes trees, shrubs, grasses, climbers, and creepers that adjust to the climate and soil of the region.
- Climate factors like temperature and rainfall determine the type of natural vegetation in an area.
- The Tropic of Cancer divides India into tropical (south) and temperate (north) regions, affecting vegetation patterns.
- Flora means plant species of a region, vegetation means plant communities, and a forest is a large area covered with trees and undergrowth.
Key Points: Importance of Forests
- Forests provide useful products such as timber, fuelwood, fruits, fibres, bamboo, paper, oils, and medicinal plants, and support many livelihoods.
- Protective functions of forests include preventing soil erosion, controlling floods, increasing soil fertility, and raising the groundwater table.
- Regulatory functions of forests help maintain climate balance by absorbing carbon dioxide, releasing oxygen, and regulating the water cycle.
- Accessory functions of forests include providing habitat to wildlife, promoting biodiversity, and offering recreation and tourism through parks and sanctuaries.
- Forest conservation laws and plantation efforts help increase tree cover, act as carbon sinks, support national security, and create employment opportunities.
Key Points: Major Types of Vegetation in India
- India has diverse natural vegetation due to variations in climate, soil, and relief.
- The Western Ghats and Andaman–Nicobar Islands have tropical evergreen forests.
- Tropical deciduous (monsoon) forests are found in regions with seasonal rainfall.
- Desert and semi-desert regions of Rajasthan have thorny and scrub vegetation.
- India’s vegetation is broadly divided into five types: Tropical Evergreen, Tropical Deciduous, Tropical Desert, Littoral (Mangroves), and Mountain forests.
Key Points: Tropical Evergreen or Rain Forests
- Tropical Evergreen (Rain) Forests are found in areas with more than 200 cm rainfall, high temperature (25°C–27°C) and high humidity.
- They are mainly found on the western slopes of the Western Ghats, North-Eastern India, and the Andaman & Nicobar Islands.
- These forests are dense and multi-layered, with very tall trees (over 60 m) and little sunlight reaching the forest floor.
- Trees do not shed leaves at the same time, so the forests remain green throughout the year and have rich biodiversity.
- Important trees include rosewood, ebony, mahogany, sissoo and gurjan, which provide hard and durable timber, though forests are not fully exploited due to dense growth.
Key Points: Tropical Deciduous Forest
- Tropical Deciduous (Monsoon) Forests are the most widespread forests in India and occur in areas with 100–200 cm rainfall.
- These forests are of two types: Moist Deciduous (100–200 cm rainfall) and Dry Deciduous (70–100 cm rainfall).
- Trees shed their leaves for 6–8 weeks during summer to reduce water loss and survive dry conditions.
- They are found along the foothills of the Himalayas, eastern slopes of the Western Ghats, Peninsular Plateau, and parts of Uttar Pradesh, Bihar, Maharashtra, and Karnataka.
- Important trees include teak, sal, sandalwood, shisham, mahua, and tendu, and these forests are commercially the most exploited in India.
Key Points: Tropical Dry Forests or Tropical Desert Vegetation
- Tropical Desert (Thorn) Forests are found in areas with less than 50 cm rainfall, high temperature (25°C–27°C) and low humidity.
- These forests occur mainly in Rajasthan, Gujarat, Punjab, Haryana, Madhya Pradesh, Maharashtra, Karnataka, and Andhra Pradesh.
- The vegetation is xerophytic, with short, stunted, thorny trees and coarse grasses adapted to dry conditions.
- Plants have special features like long roots, small or no leaves, thorns, and fleshy stems to reduce water loss.
- Important trees include babool (acacia), date palm, neem, ber, khair, and cactus, which have economic and medicinal value.
Key Points: Mangrove Forests (Tidal Forest)
- Littoral or Tidal (Mangrove) Forests grow in wet, marshy, coastal and delta regions where land meets sea.
- These forests occur in areas with 26°C–29°C temperature and rainfall below 200 cm.
- They are mainly found in the Sundarbans (Ganga Delta), Andaman & Nicobar Islands, and the Mahanadi, Godavari, and Krishna deltas.
- Trees have special adaptations like stilt roots and breathing roots (pneumatophores) to survive in waterlogged and saline conditions.
- Important trees include sundari, rhizophora, keora, palms, and canes, which provide fuel and durable timber.
Key Points: Mountain or Montane Forest
- Mountain (Montane) Forests occur at 1000–4000 m altitude, where temperature decreases with height.
- These forests are found mainly in the Himalayas and also in Vindhyas, Nilgiris, Western and Eastern Ghats.
- Vegetation changes with altitude—deciduous forests at foothills, conifers (pine, deodar, spruce) at higher levels, and alpine grasslands near the snowline.
- Climatic conditions include 12°C–13°C temperature, 100–300 cm rainfall, and moderate humidity.
- In Peninsular India, temperate mountain forests are called Sholas, found in Nilgiris, Anaimalai and Palani hills.
Key Points: Correlation of the Forests with the Environment
- Forests regulate climate by controlling temperature, humidity and rainfall.
- Forests purify air by absorbing carbon dioxide and reducing atmospheric pollution.
- Trees prevent soil erosion and floods by reducing wind speed and surface run-off.
- Forests help in water percolation, thereby recharging the groundwater table.
- Decay of forest litter forms humus, which increases soil fertility and supports plant growth.
Key Points: Forest Conservation
- Forests are declining due to deforestation, caused by agriculture expansion, overgrazing, urbanisation, industries and river valley projects.
- Loss of forest cover leads to soil erosion, floods and droughts, as forests help regulate water flow and rainfall.
- Forests absorb carbon dioxide; their decline increases greenhouse effect and global warming.
- India needs forest conservation to protect soil fertility, groundwater, climate balance and wildlife habitats.
- Reduced forests lower agricultural productivity by decreasing humus content and causing land degradation.
Key Points: Measures for Forest Conservation
- Afforestation and reforestation help increase forest cover and reduce pressure on existing forests.
- Strict laws and bans on indiscriminate tree felling are needed to control deforestation.
- Alternative energy sources like solar energy and LPG reduce dependence on firewood.
- People’s participation through programmes like Van Mahotsav and Chipko Movement helps protect forests.
- Planting trees around industries and barren lands controls pollution and restores degraded land.
Key Points: Role of Government in Forest Conservation
- National Forest Policy (2018) aims to bring one-third of India’s land area under forest cover through conservation, afforestation and sustainable forest management.
- The government promotes soil conservation, watershed management and desert control to protect land and maintain ecological balance.
- Social forestry focuses on planting trees to provide fuel, timber, employment, improve environment and raise the groundwater table.
- Agroforestry combines agriculture and forestry to reduce soil erosion, maintain soil fertility and reduce pressure on natural forests.
- Community forestry and farm forestry encourage people’s participation by growing trees on community and agricultural lands for common and personal use.
Important Questions [62]
- Name One Region in India for Each of the Following: Tidal Forest
- Name One Region in India for Each of the Following: Explain Why Thorn and Scrub Forests Are Found in the Above-mentioned Regions.
- Briefly Explain Two Reasons for Forests Being an Important Natural Resource.
- Give Two Reasons to Explain as to Why We Need to Conserve Our Forest Resource.
- Mention Two Conditions Required for the Growth of Littoral Forest.
- State One Characteristic Feature of the Forest Found in the Nilgiri Hills
- Name the Forest Which is Commercially Most Important in India.
- Give One Important Use of the Following Types of Trees: [3] I. Sundari Ii. Sandalwood Iii. Rosewood
- Name a State in India Where Thorn and the Scrub Forest is Found.
- Give Two Ways in Which Forests Are Important.
- Mention two main characteristics of Tropical Rain Forests.
- Name the tree, the timber of which could be used for the following: A soft and white timber used for making toys and matchboxes.
- Name the tree, the timber of which could be used for the following: A hard durable timber used for shipbuilding and furniture making.
- Name the Tree, the Timber of Which Could Be Used for the Following: a Sweet Smelling Timber Which Yields an Oil, Used for Making Handicrafts.
- Name One Region in India for Each of the Following: Thorn and Scrub
- Name Two Trees Which Grow in this Forest.
- Name the Forests Which Grow on the Wind Ward Slope of the Western Ghats.
- Why Do Tropical Evergreen Forests Grow in this Region?
- To Which Type of Forest Do the Following Trees Belong? Hintal and Sundari
- To Which Type of Forest Do the Following Trees Belong? Hintal and Sundari
- To Which Type of Forest Do the Following Trees Belong? Deodar and Chir Pine
- Give Three Reasons for Rapid Depletion of Forest Resources in India in the Past.
- Give a Geographical Reason for Each of the Following: Reforestation Should Be Practiced Extensively.
- State two characteristics of Tropical deciduous forests.
- State Two Reasons Why Tropical Evergreen Forests Are Difficult to Exploit.
- With Reference to Littoral Forest, Answer the Following Questions: Why Do the Trees in this Forest Grow Aerial Roots?
- With Reference to Littoral Forest, Answer the Following Questions: Name One Area in India Where this Forest is Found.
- Differentiate Between Afforestation and Deforestation
- State the Disadvantage of Deforestation.
- Mention Two Reasons Why Monsoon Deciduous Forests Are Commercially More Valuable than the Other Types of Forests.
- How Do Forests Have a Favourable Effect on the Climate of the Region?
- How Do Forests Act as a Flood Control Measure?
- Which type of forest is found mostly in the coastal areas of India?
- Give a reason to explain the following: The tropical evergreen forests do not look bare at any time of the year.
- Name one region in India where tropical evergreen forest is found.
- Why is the Tropical Deciduous Forest commercially the most exploited forest belt of India? (Two points)
- How is tropical monsoon forest useful for the Indian economy? (Any two points)
- Give a reason to explain the following: Stilt like/aerial roots are a typical feature of littoral forest.
- In which natural vegetation belt is Sundari tree found?
- Give a reason to explain the following: Mountains have varied vegetation.
- Name Any Two Trees Found in Tropical Evergreen Forests .
- Name the Tree as per the Characteristics Are Given Below the Wood is Hard and Suitable for Ship Building
- Name the Tree as per the Characteristics Given Below the Stilt Roots Are Underwater During High Tide.
- Name the Natural Vegetation Found in the Following Regions: the Western Slopes of the Western Ghats
- Name the Natural Vegetation Found in the Following Regions: the Nilgiris
- Name the Natural Vegetation Found in the Following Regions: Western Rajasthan
- Identify the Tree as per Its Characteristics Mentioned Below: It Yields Wood that is Hard and Scented and is Usually Found in High Altitudes.
- Identify the Tree as per Its Characteristics Mentioned Below: Sundari
- Identify the tree as per its characteristics mentioned below: The furniture made from this tree is generally the most expensive.
- Name the Natural Vegetation Largely Found in the Following Regions: the Delta of the Ganga River.
- Name the Natural Vegetation Largely Found in the Following Regions: the Windward Side of the Western Ghats
- Name the Natural Vegetation Largely Found in the Following Regions: the Deccan Plateau
- Give Two Reasons to Explain as to Why the Tropical Evergreen Forests Are Difficult to Exploit for Commercial Purpose.
- Briefly explain the following: The trees in the Tropical Desert Forest have stunted growth.
- There is a Gradual Increase in the Forest Cover in India in Recent Times.
- The Trees in Monsoon Deciduous Forests, Shed Their Leaves for About 6-8 Weeks During March and April.
- State two ways in which forests help in protecting the environment.
- How is the Forest of Great Commercial Value to India?
- Explain Why the Forest Cover in India is Shrinking?
- Mention One Forest Conservation Method Followed in India.
- Mention any two forest conservation methods that may be adopted to protect the forests.
- Read the table and identify the pair that is correctly matched: Natural Vegetation Belt P Tropical evergreen Q Tropical deciduous R Littoral S Mountain forest Tree Babool Teak Ebony Banyan
Concepts [12]
- Introduction of Natural Vegetation
- Importance of Forests
- Major Types of Vegetation in India
- Tropical Evergreen or Rain Forests
- Tropical Deciduous Forest
- Tropical Dry Forests or Tropical Desert Vegetation
- Mangrove Forests (Tidal Forest)
- Mountain or Montane Forest
- Correlation of the Forests with the Environment
- Forest Conservation
- Measures for Forest Conservation
- Role of Government in Forest Conservation
