Class 7th Ncert Notes Life In Grasslands Prairies Velds ch 9

Class 7th Ncert Notes Life In Grasslands Prairies Velds ch 9

Class 7th Ncert Notes Life In Grasslands Prairies Velds ch 9

Grasslands –

  • Grassland can be defined as a region where grasses form the dominant type of plant life.
  • Grasslands make up almost a quarter of the total land surface.
  • The types of plants that grow here greatly depend on what the climate and soil are like.
  • As climate plays an important role in the formation of grasslands, it is generally used as a basis to divide the world’s grasslands into two broad categories:
  1. Temperate Grasslands – Temperate Region
  2.  Tropical Grasslands  – Tropic Region

Grasslands – THE PRAIRIES

  • The temperate grasslands of North America are known as the Prairies
  •  It is a region of flat, gently sloping or hilly land.
  • For the most part, prairies are treeless but, near the low lying plains, flanking river
    valleys, woodlands can be found.
  • Tall grass, up to two metres high, dominates, the landscape.
  • It is actually a “sea of grass.”
  • The prairies are bound by the Rocky Mountains in the West and the Great Lakes in the East
  •  The prairies cover parts of United States of America and parts of Canada.
  • In the USA, the area is drained by the tributaries of Mississippi.
  • The Canadian prairies are drained by the tributaries of Saskatchewan Rivers.
  • The grasslands of Prairies were the home of American Indians, more popularly known as
    ‘Blackfoot Indians’.
  • The Prairies were home of other tribes also like the Apache, the Crow, the Cree and the Pawnee.
The PrairiesLocation and important Features
Located InNorth America – America And canada
Type Of GrasslandsTemperate GrassLands
Important Features1-It is a region of flat, gently sloping or hilly land.
2-For the most part, prairies are treeless but, near the low lying plains, flanking river
valleys, woodlands can be found.
3-Tall grass, up to two metres high, dominates, the landscape.
4-It is actually a “sea of grass.”
5-The prairies are bound by the Rocky Mountains in the West and the Great Lakes in the East
Rivers1-In the USA, the area is drained by the tributaries of Mississippi.
2-The Canadian prairies are drained by the tributaries of Saskatchewan Rivers.
bound between Rocky Mountains And Great LakesThe prairies are bound by the Rocky Mountains in the West and the Great Lakes in the East
Tribes1-The grasslands of Prairies were the home of American Indians, more popularly known as
‘Blackfoot Indians’.
2-The Prairies were home of other tribes also like the Apache,
3- the Crow,
4- the Cree and
5- the Pawnee.
CLIMATE1-Being located in the heart of a continent, the climate is of continental type with extreme temperatures.
2-The summers are warm with temperatures of around 20°C,
3-while in winter -20°C has been recorded in Winnipeg, Canada.
4-In winters a thick blanket of snow covers this region.
5-The annual rainfall is moderate and is ideal for the growth of grass.
6-Due to the absence of the north-south barrier, a local wind “Chinook” blows here
Chinook a Local Wind Blow here in prairies1-Chinook is a hot wind that blows in winter and therefore raises the temperature in a short time.
2-This increase in temperature results in the melting of snow, making pasture land available for grazing of animals.
FLORA AND FAUNA1 -Prairies are practically tree-less.
2- Where water is available, trees such as willows, alders and poplars grow.
3-Places that receive rainfall of over 50 cm, are suitable for farming as the soil is fertile.
4- the major crop of this area is maize, other crops including potatoes, soybean, cotton and alfa-alfa is also grown.
5-Areas where rainfall is very little or unreliable, grasses are short and sparse.
6-These areas are suitable for cattle rearing.
7-Large cattle farms called ranches are looked after by sturdy men called cowboys
Bison – Buffalo1-Bison or the American buffalo is the most important animal of this region
2- It nearly got extinct due to its indiscriminate hunting and is now a protected species.
3-The other animals found in this region are rabbits, coyotes, gophers and Prairie dog.
PEOPLE and occupation1-The Prairies are also known as the “Granaries of the world,” due to the huge surplus of wheat production.
2-Dairy farming is another major industry.
3-The dairy belt extends from the Great Lakes to the Atlantic Coast in the east.
4-Dairy farming and extensive agriculture both promote setting up of food processing industries.
5- Major industrialised areas
6- Iron and Minerals mines are Located in this region

Grasslands – Velds

  • The temperate grasslands of South Africa are called the velds.
  • Velds are rolling plateaus with varying heights ranging from 600 m to 1100 m.
  • It is bound by the Drakensburg Mountains on the east.
  • To its west lies the Kalahari desert.
  • On the northeastern part, “high velds” are located that attain a height of more than 1600 m, in some places.
  • The tributaries of rivers Orange and Limpopo drain the region
Velds GrasslandsSouth Africa
Type
  1. Temperate Grasslands
Located In
  • South Africa
Bounded By
  • It is bound by the Drakensburg Mountains on the east.
  • To its west lies the Kalahari desert.
height
  • 600 m to 1100 M
  • High velds located at height of 1600 m
Tributaries
  • The tributaries of rivers Orange and Limpopo drain the region
CLIMATE
  • 1-The velds have a mild climate due to the influence of the Indian Ocean.
    2-Winters are cold and dry.
    3-Temperatures vary between 5°C and 10°C and July is the coldest
    month.
    4-Summers are short and warm.
    5- Johannesburg records about 20°C temperature in the summer
    6-The velds receive rainfall mainly in the summer months from November to February.
    7-This is mainly because of the warm ocean currents that wash the shores of the
    velds.
    8- If the rainfall is scanty in the winter months from June till August, drought may occur
FLORA AND FAUNA
  • 1-The vegetation cover is sparse.
    2- Grasses dominate the landscape.
    3-Red grass grows in bush velds.
    4- In the high velds acacia and maroola are seen to be growing.
    5- The animals of the velds are primarily lions, leopards, cheetah and kudu
PEOPLE and industry
  • 1-Velds are known for cattle rearing and mining.
    2- The soils are not very fertile in the velds due to the presence of discontinuous grasses exposing barren surface.
    3-The main crops are maize, wheat, barley, oats and potato.
    4- Cash crops like tobacco, sugarcane and cotton are also grown
    5-Sheep rearing is the most important occupation of the people
    6-Merino sheep is a popular species and their wool is very warm.
    7- Dairy farming is the next important occupation.
    8-Cattle are reared in the warmer and wetter regions and the dairy products like butter, cheese are produced for both domestic supply and also for export.
Minerals
  • The velds have rich reserve of minerals. Iron and steel industry has developed where
    coal and iron are present.
Gold And Diamonds
  • 1-Gold and diamond mining are major occupations of people of
    this region.
    2- Johannesburg is known for being the gold capital of the world.
    3- Kimberley is famous for its diamond mines

 

Download Free Study Material

 

 

 

 

To Download This File Click On The Download- Download Now