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Social sciences: geography

Grade 6

Climate and vegetation regions of the world

Module 9

The main biomes (vegetation regions)

  1. The 5 main biomes
  • Vegetation across the world is divided into five large biomes :
  1. The Forest Biome
  • Tropical forests
  • Temperate forests
  • Deciduous forests
  • Needle leaf forests
  • Mediterranean forests (Sclerophyll bush)
  • Savannah Biome
  • Grasslands Biome
  • Desert Biome
  • Tundra and ice fields Biome

Remember this!

Human beings have altered or destroyed the original environment of many parts of the world.

2. Area division of the different biomes

Main biomes of the world
Biome Area(million km 2 ) Percentage
Forests 52,3 40,1
Savannah 21,8 16,7
Grasslands 8,8 6,8
Deserts 33,8 25,9
Tundra 13,7 10,5

THE FOREST BIOME

  • This biome is dominated by various tree species. In some forests the dense canopy of treetops grows so closely that sunlight cannot penetrate to the ground. In other areas the trees are further apart and sunlight can partially penetrate the tree canopy.
  • The most important of these forests is the tropical rainforest. These forests are close to the Equator (in the tropics) where it is hot all year round with a very high rainfall. Most of the trees in tropical rainforests are broadleaf, evergreen trees. Palms and tree ferns are also found here. Relatively few people live in tropical rainforests because of the dense vegetation, which makes it difficult to move about.
  • In the deciduous forests , oak, walnut, willow and poplar trees are found. They shed their leaves during the winter season while the temperate evergreen forests are found in regions with rain throughout the year. Pine trees with their pine-cones, called coniferous trees, are found in these forests. Many different kinds of insects, reptiles, spiders and birds live in these forests. The deciduous and temperate forests are found mostly in the regions that are densely populated ((North America, Europe and Asia). Through the ages people have been dependent on these forests for shelter, food, wood for their houses, weapons and energy.

Activity 1:

To discuss the effect of dense populations on natural forests

[lo 1.1]

Discuss in your groups the effect of densely populated areas on natural forests and how nature can be protected. Write a brief report on the findings of your group.

  • Needle leaf forests occur between 50 °N and 70 °S and are adapted to long, cold winters and short summers.
  • The downward sloping leaves of these trees make provision for snow to slide off the leaves.
  • The branches are supple; therefore the weight of the snow does not break them easily.
  • Very thick bark protects the trunk against the low temperatures.
  • The needle-like leaves also allow the snow to slide off easily and their small surfaces reduce the trees’ level of exposure to the cold winter winds.
  • The needles are covered with a waxy layer that reduces evaporation.

Unfortunately uncontrolled mining methods such as opencast mining, drilling for oil and the establishment of infrastructures that include roads and towns or cities, have damaged this natural biome to a large extent.

Questions & Answers

what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
how to synthesize TiO2 nanoparticles by chemical methods
Zubear
what's the program
Jordan
?
Jordan
what chemical
Jordan
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Geography grade 6. OpenStax CNX. Sep 07, 2009 Download for free at http://cnx.org/content/col11000/1.1
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