Key Concepts - Natural Vegetation and Wildlife Class 9 Notes | EduRev

Social Studies (SST) Class 9

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Class 9 : Key Concepts - Natural Vegetation and Wildlife Class 9 Notes | EduRev

The document Key Concepts - Natural Vegetation and Wildlife Class 9 Notes | EduRev is a part of the Class 9 Course Social Studies (SST) Class 9.
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  1. With over 47,000 plant species, India occupies tenth place in the world and fourth in Asia in plant diversity.
  2. India has 89,000 species of animals as well as a rich variety of fish in its fresh and marine waters.
  3. Plant community which grows naturally with no human help and is not disturbed by humans for a long time is teemed as natural vegetation.
  4. Virgin vegetation which are purely Indian are known as endemic species and those which have come from outside India are termed as exotic plants.


Relief

  1. The nature of land influences the type of vegetation.
  2. Different types of soils provide basis for different types of vegetation.


Climate

  1. The character and extent of vegetation are mainly determined by temperature along with humidity in the air, precipitation and soil.
  2. Period of exposure to sunlight varies for different plants leading to their different rates of growth.
  3. Areas of heavy rainfall have more dense vegetation as compared to other areas of less rainfall.
  4. Forests are renewable resources and play a major role in enhancing the quality of the environment.
  5. Vegetation in most parts of India has been modified at some places, or replaced or degraded by human occupancy.


Ecosystem

  1. All the plants and animals in an area are interdependent and interrelated to each other in their physical environment, thus forming an ecosystem.
  2. A very large ecosystem on land having distinct type of vegetation and animal life is called a biome.


Types of Vegetation

  1. The major types of vegetation in India are Tropical Rainforests, Tropical Deciduous Forests, Tropical Thorn Forests and Scrubs, Montane Forests and Mangrove Forests.
  2. With warm and wet climate all year round the Tropical Rainforests have luxurious trees, shrubs and creepers.
  3. A large variety of animals are found in the rainforests.
  4. The most widespread forests of India — the Tropical Deciduous Forests — are also known as the Monsoon Forests.
  5. On the basis of the availability of water, these forests are further divided into moist and dry deciduous forests.
  6. The leaves of vegetation in Thorn Forests and Scrubs are mostly thick and small to minimise evaporation and have succulent stems to conserve water.
  7. Montane forests have a succession of natural vegetation belts in the same order as we see from the tropical to the Tundra region.
  8. Wet temperate forests are found between a height of 1000 and 2000 metres while temperate grasslands are found at higher elevations.
  9. At 3600 metres above sea level temperate forests and grasslands give way to alpine vegetation.
  10. The mangrove tidal forests are found in the areas of coasts influenced by tides.
  11. Dense mangroves are the common varieties with roots of the plants submerged underwater.


Wildlife

  1. India has more than 1200 species of birds, 2500 species of fish and between 5 to 8 per cent of the world’s amphibians, reptiles and mammals.
  2. India is the only country in the world that has both tigers and lions.
  3. The Himalayas have a large range of animals that survive the bitter cold.
  4. Every species of animal has a role to play in the ecosystem; hence conservation is essential.
  5. Hunting and pollution is causing threat to animal species.
  6. To protect the flora and fauna of the country, the government has taken many steps.
  7. Fourteen biosphere reserves have been set up in the country to protect flora and fauna.
  8. 89 National Parks, 49 Wildlife Sanctuaries and Biosphere Reserves have been set up to take care of natural heritage.
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