GSEB Class 9 Social Science Notes Chapter 17 Natural Vegetation

   

Our Revision Notes for GSEB Class 9 Social Science Notes Chapter 17 Natural Vegetation summarises the key points of a chapter and useful resource to prepare effectively for the upcoming board exams.

Natural Vegetation Class 9 GSEB Notes Social Science Chapter 17

Natural Vegetation Class 9 GSEB Notes

→ There are about 5000 varieties of trees in India, out of which 450 trees are useful commercially.

→Besides, about 15,000 flowering plants also grow which form about 6% of the world.

→Non-flowering plants like fem, algae, moss etc. are also available in our country.

→ India is famous since ancient times for the herbal plants.

GSEB Class 9 Social Science Notes Chapter 17 Natural Vegetation

→ About 2000 medicinal plants are described in Ayurved.

Type of Natural Vegetation
The natural vegetation regions can be divided into five types :
(1) Tropical Rain Forest

  • Tropical Rain Forests are found in hot and humid regions where anuual rainfall exceeds 200 cm and temperature is more than 22° C.
  • Trees found here are Mahogany, Ebony, Rosewood, rubber etc.
  • Trees are about 60 metres tall or even more.

(2) Tropical Deciduous Forests :

  • These forests are found in the regions receiving about 70 to 200 cm rainfall.
  • Major trees found here are teak, saal, sesame, sandalwood, kher (acacia catechu) bamboo etc.
  • The trees shed their leaves for 6 to 8 weeks during autumn. Every species has a different time to shed the leaves.

GSEB Class 9 Social Science Notes Chapter 17 Natural Vegetation

(3) Tropical Desert Vegetation

  • These forests are found in the regions less than 70 cm of rainfall.
  • Dates, jujube, acacia, cactus, khijdo etc. are common trees found here.
  • The roots of the trees and plants here are long, deep and widespread.
  • Leaves are shorter which result in slower evaportranspiration process.

(4) Temperate Forests and Grasslands (Flimalayan Vegetation)

  • These forest also called as coniferous forests. These are found at activities between 1000 metres to 3600 meters and above in Flimalayas.
  • There are tropical forests, coniferous forests, alpine and short grase (tundra vegetation) seen here.
  • A major characteristic of the coniferous forests is that the trees have conical shape.
  • Their branches lean towards the surface so that the snow would easily slide down towards the land.

(5) Tidal Forests (Mangroves)

  • Tidal forests are located in the delta regions of river along the coast.
  • These forests are found along Gujarat coast and in the marshy lands along the Bay of Bengal coast.
  • Sundari and cher types of trees are seen.

GSEB Class 9 Social Science Notes Chapter 17 Natural Vegetation

Forest products and their utility

  • Timber wood from teak and saal is used for furniture making.
  • Boats are prepared from the wood of sundari trees of Sundarvan.
  • Sports goods and packing boxes are prepared from the wood of pine and child trees.

Forest conservation

  • Ecosystem is formed due to the interrelation of biosphere and mankind.
  • Due to the anti-environmental’ activities and selfishness of man, the ecosystem is disturbed.
  • Forests are destroyed by increasing population.
  • Ecological balance is distrupted due to the destruction of forests.

Remedies to conserve forests :

  • The Government of India implemented a National Forest Policy in 1952.
  • In 1980, the Parliament passed Legislative Act and in 1988 a new National Policy was announced.

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