Natural Vegetation & Wildlife - Land, Soil & Water Resources | Social Studies (SST) Class 8 PDF Download

Biosphere

• Natural vegetation and wildlife exist only in the narrow zone of contact between the lithosphere, hydrosphere and atmosphere that we call biosphere. 
  
• In the biosphere living beings are interrelated and interdependent on each other for survival. 
• This life-supporting system is known as the ecosystem. Vegetation and wildlife are valuable resources.

• Plants provide us with timber, give shelter to animals, produce oxygen we breathe, protect soils so essential for growing crops, act as shelter belts, help in storage of underground water, give us fruits, nuts, latex, turpentine oil, gum, medicinal plants and also the paper that is essential for your studies. There are innumerable uses of plants and you can add some more.

Importance of Wildlife

• Wildlife includes animals, birds, insects as well as the aquatic life forms. They provide us with milk, meat, hides and wool. 
• Insects like bees provide us honey, help in pollination of flowers and have an important role to play as decomposers in the ecosystem. 
• The birds feed on insects and act as decomposers as well. Vulture due to its ability to feed on dead livestock is a scavenger and is considered a vital cleanser of the environment. So animals big or small, all are integral to maintaining balance in the ecosystem.

Wildlife

Distribution of Natural Vegetation

• The growth of vegetation depends primarily on temperature and moisture. The major vegetation types of the world are grouped as forests, grasslands, scrubs and tundra.
• In areas of heavy rainfall, huge trees may thrive. The forests are thus associated with areas having an abundant water supply. 
• As the amount of moisture decreases the size of trees and their density reduces. 
• In the regions of moderate rainfall, short stunted trees and grasses grow forming the grasslands of the world. 
• In dry areas of low rainfall, thorny shrubs and scrubs grow. In such areas plants have deep roots and leaves have thorny and waxy surface to reduce loss of moisture by transpiration. 
• Tundra vegetation of cold Polar Regions comprises of mosses and lichens.

(A) Grassy scrubland, (B) Grassy scrubland with scattered trees, (C) Dense savanna, (D) Cerrado woodland, (E) Gallery forest, (F) Wet field.

Evergreen & Deciduous Forests

• Forests are broadly classified as evergreen and deciduous depending on when they shed their leaves. 

Deciduous Forest

• Evergreen forests do not shed their leaves simultaneously in any season of the year. 
• Deciduous forests shed their leaves in a particular season to conserve loss of moisture through transpiration.

Evergreen Forest

• These forests are further classified as tropical or temperate based on their location in different latitudes.

Conservation of Natural Vegetation and Wildlife

• Forests are our wealth. Plants give shelter to the animals and together they maintain the ecosystem. 
• Changes in climate and human interference can cause the loss of natural habitats for plants and animals.
• Many species have become vulnerable or endangered and some are on the verge of extinction.

Natural Vegetation and Wildlife

• Deforestation, soil erosion, constructional activities, forest fires, tsunamis and landslides are some of the human-made and natural factors which together accelerate the process of extinction of these great natural resources. 
• One of the major concerns is the increasing incidents of poaching that result in a sharp decline in the number of particular species. 
• The animals are poached for collection and illegal trade of hides, skins, nails, teeth, horns as well as feathers. Some of these animals are tigers, lions, elephants, deer, blackbuck, crocodile, rhinoceros, snow leopard, ostrich and peacock.
• There is a balance in the environment if the relative number of species is not disturbed. 
• Human activities in several parts of the world have disturbed the natural habitats of many species. 
• Due to indiscriminate killings, several birds and animals have either become extinct or are on the verge of extinction.
• Awareness programs like social forestry and Vanmohatasava should be encouraged at the regional and community level. 
• School children should be encouraged to watch birds and visit nature campus so that they appreciate the habitat of varied species.