Transcript Revision lesson

Unit 1 Revision
Topic 3: Battle for the Biosphere
Main points you need to know
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Describe the global distribution of different biomes
Explain reasons for this distribution including climate and local factors
How people rely on the biosphere for goods and services
How humans are degrading the Amazon rainforest
How humans can manage the Amazon in a more sustainable way
Explain what sustainable development means
Show how species/habitats can be protected globally, nationally and
locally.
Unscramble the letters to name the
biomes
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NAROFTRIS CLAPTIRO
TREESD THO
OFTRES TREEPMATE
FEER LOCAR
ANSWERS
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Tropical rainforest
Hot desert
Temperate forest
Coral reef
• So, what is a BIOME?
BIOME = large scale ecosystem
Eg – tropical rainforest such as the Amazon
Eg Coral reef such as the Great Barrier Reef
What biome covered 90% of the UK before
humans destroyed most of it?
UK’s natural biome
Temperate deciduous forest – eg Ashridge
Woods –
- Mixed woodland including oak, ash,
sycamore, beech …
- other plant species like bracken, bluebells
- animals like deer and foxes
- Insects like woodlice and ants
The distribution of Biomes –
where are the tropical rainforests?
Can you name some of the countries where
tropical rainforest is found?
Why are tropical rainforest found
close to the equator?
Why are tropical rainforests found
along the equator?
• TEMPERATURE – What? Why? How
does this affect the ecosystem?
• RAINFALL – What? Why? How does this
affect the ecosystem?
• OTHER FACTORS?
Practice Question (6 mins):
a) Describe the distribution of tropical forests. (2 marks)
b) Explain reasons for this distribution of tropical rainforests. (4 marks)
Example answer
a)
Describe the distribution of tropical forests. (2 marks)
2 marks = 2 minutes = 2 points in your answer.
ANSWER:
Tropical rainforests are found close to, and along, the equator between
the Tropic of Cancer and Tropic of Capricorn in places like Brazil
and South East Asia.
Where does this answer get the marks?
Example answer
b) Explain reasons for this distribution of tropical rainforests. (4 marks)
4 marks = 4 minutes = 2 points, both explained
ANSWER:
Tropical rainforests are found close to the equator because the climate is warm
and wet. The warm climate (27 degrees) is because the sun’s energy is
strong here as the sun passes directly overhead and is closer. This
means the climate is warmer which is good for plants to grow.
Also, this area has a high rainfall (2m/yr). This is because convectional rainfall
falls everyday and it is a low pressure area. Plants therefore have plenty
of water to photosynthesise and grow.
Where does this answer get the marks?
Good and Services – put the following into
the right category:
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Mahogany timber for furniture
Oxygen released after photosynthesis
Oranges, lemons, rubber sap
Rosy periwinkle plant used in leukaemia treatment
Trees intercepting rainfall and so preventing flooding
Helping the soil stay fertile (leaf litter from trees broken down into
hummus)
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GOODS = things of value to us
SERVICES = things that satisfy our needs
How are humans threatening the
Biosphere?
Think of at least 5 ways
How are humans threatening the
Biosphere?
IDEAS:
Increased population – more resources like fuel
needed, more food, more living space.
Wealthier population – can afford to buy and throw
away more goods
More travel – cars, planes…
Deforestation (for mining, cattle ranching, building,
farming)
Pollution
Etc!
INTERNATIONAL
CONSERVATION
CITES
• Stops trade between 175 countries in
endangered species and their products –
eg ivory, crocodile skins
NATIONAL CONSERVATION
• How many of England’s National Parks
can you name?
UK’s National Parks
• There are 15 National Parks
• Including mountains, meadows,
moorlands, woods and wetlands.
• They are areas of protected countryside
that everyone can visit, and where people
live, work and shape the landscape.
LOCAL CONSERVATION
What am I?
• 80 acres
• Near Heath and Reach
• Includes a lake, ancient coniferous
woodland, meadows, heath.
LOCAL CONSERVATION
Stockgrove Park and Oak Wood
Managed by The GreenSand Trust
• Clear trees in some places to encourage
heathland to develop
• Visitor centre educating people
• No cycling or horse riding in Stockgrove
• No campfires or bonfires
Practice Question
Use examples to explain how the biosphere
can be conserved in different ways.
( 4 marks)
Example answer
Use examples to explain how the biosphere can be conserved in
different ways. ( 4 marks)
4 marks = 4 mins = 4 points including explanation and evidence from
examples
The biosphere can be conserved by controlling what activities humans
are allowed to do. For example, bonfires are not allowed in
Stockgrove Park, Leighton Buzzard as they can spread to through
the woodland. This helps to protect the ecosystem from fire.
Another way is to protect certain species. For example CITES controls
the trade in products like ivory. This means it is harder to sell ivory
so fewer people will poach elephants.