please give me note of cbse class 7 geography book chapter 6
Answers
Forests
- Forests grow where temperature and rainfall are plentiful to support a tree cove
- They are of 6 types- Tropical Evergreen,Tropical Deciduous, Temperate Evergreen, Temperate Deciduous, Mediterranean Vegetation and Coniferous forests
Grasslands
- They are found in the regions of moderate rainfall. The are of 2 types - Tropical Grasslands which have tall coarse grass and Temperate Grasslands.
- Tropical Grassland occurs on either side of the equator and extend till the tropics. Tropical Grassland of Africa is called the Savannah.
Thorny Bushes
- They are found in the dry desert like regions.
- These are found in areas with scanty rain and scorching heat.
Tundra Vegetation
- Mosses,lichens are very small Shrubs are found in cold regions. This is called Tundra type of vegetation.
- It is found in polar areas.
Trees,grass,lichen, mosses,etc. that grow naturally without human interference constitute natural vegetation.
The growth of natural vegetation depends on temperature and moisture.It also depends on factors such as slope and thickness of soil.
Natural vegetation is classified into three categories- forests, grassland and shrubs.
The changes in the type of natural vegetation occur mainly because of the change in climatic condition.
Forests grow where temperature and rainfall are plentiful to support a tree cover Forests may be dense and open.
Tropical evergreen forest also known as tropical rainforests are very dense and are found in the region near the equator and close to the tropics. Hardwood trees such as Rosewood, Ebony ,Mahogany are common here.
Tropical deciduous forests are monsoon forest. They are found in a large part of India, Northern Australia and in Central America. They shed their leaves in dry seasons. Trees like sal,teak,neem and shisham are found here.
Temperate evergreen forest are commonly found along the eastern margin of the continents. In these forests both hard and softwood trees such as oak, pine, eucalyptus, etc are found.
Temperate deciduous forests are found in the north eastern part of USA, China, New Zealand and Chile. They shed their leaves in the dry season. Trees like oak, ash, beech etc. and animals like deer, foxes, wolves are common in these forests.
Mediterranean vegetation is mostly found in the areas around the Mediterranean sea in Europe, Africa, and Asia. Mediterranean vegetation is mainly comprised of citrus fruits such as oranges, figs, olives and grapes.
Coniferous forests are also known as Traga. These forests are also found in the higher latitudes of Northern Hemisphere. They are also found in the higher altitudes. The trees are tall, softwood evergreen trees. Chir, pine, cedar is an important variety of trees in these forests. Animals such as silver fox, mink, polar bear are common here.
Grassland include tropical and temperature grasslands. Tropical grasslands grow in the areas of moderate to low amount of rainfall. Savannah grasslands of Africa present a suitable example of these types of grasslands. Animals like elephant, zebras, giraffes, dear are commonly found here.
Temperate grasslands are found in the mid-latitudenal zones and in the anterior part of the continents. Short and nutritious grass is found here. Common animals are buffaloes, bison, antelopes etc.
Thorny bushes are found in the dry deserts. Here, vegetation cover is scarce because of poor rain and scorching heat.
Polar regions are cold and their natural vegetation is limited here. Only mosses,lichens and very small shrubs are found here. Vegetation found in the polar region is called Tundra type of vegetation. Seal, walruses, musk-oxen, arctic owl etc. are common here.
Natural vegetation
- Trees, grass, lichens, mosses, etc. that grow naturally without the interference of human beings are called Natural vegetation.
Forests
- They grow where temperature and rainfall are plentiful to support a tree cover. Forests may be dense and open.
Grasslands
- They grow in the region of moderate rain.
Shrubs
- These consists of thorny shrubs and scrubs.
Anaconda
- It is one of the world's largest snakes found in the tropical rainforests. Taiga. It means pure or untouched in the Russian language.