Why do rainforest trees grow tall straight trunks with branches only at the top?

Because light is only available above the shade of their neighbours, so they invest in height and put out leaves where the sunlight actually is.

What are buttress roots and what job do they do?

Wide wing-like roots flaring from the base of a tall trunk, which brace the tree because its shallow roots in a thin soil give it very little anchorage.

What is a drip tip and why is it an advantage?

A pointed leaf end that lets heavy rain run off quickly, so water does not lie on the leaf and allow algae or fungi to grow on it.

Edexcel GCSE Geography A 1GA0

Changing Cities

Topic overview Global urbanisation trends and rates The UK’s urban population and why urbanisation varies by region The chosen UK city: site, situation, connectivity and structure Urbanisation, suburbanisation and migration in the chosen UK city Population change and deindustrialisation in the chosen UK city Inequality and changes in retailing in the chosen UK city Making the chosen UK city more sustainable The chosen developing or emerging city: site, situation and structure Population growth and migration in the chosen developing or emerging city Inequality and quality of life in the chosen developing or emerging city Rapid urbanisation: challenges, and bottom-up and top-down responses Government policy and quality of life in the chosen city

Coastal Landscapes and ProcessesLandscape option

Topic overview Coastal processes: weathering, mass movement, erosion, transport and deposition Geology, wave type and UK weather at the coast Coastal landforms of erosion and deposition Coastal recession, flooding and coastal defences A named distinctive coastal landscape in the UK

Ecosystems, Biodiversity and Management

Topic overview The world’s large-scale ecosystems and what controls their distribution The biosphere as a resource, and its commercial exploitation UK terrestrial and marine ecosystems Tropical rainforest characteristics and the nutrient cycle Rainforest biodiversity and plant and animal adaptations Rainforest goods and services, and the causes of deforestation Sustainable management of a named rainforest Deciduous woodland characteristics and the nutrient cycle Woodland biodiversity and plant and animal adaptations Woodland goods and services, and the causes of deforestation Sustainable management of a named deciduous woodland

Energy Resource ManagementResource option

Topic overview Renewable and non-renewable energy resources compared The UK’s energy mix and why energy mixes vary Rising energy demand and the development of non-renewables Developing renewables, and fracking Stakeholder attitudes to energy Sustainable management of energy resources

Geographical Investigations – Fieldwork

Topic overview River fieldwork: enquiry questions, methods and secondary data Coastal fieldwork: enquiry questions, methods and secondary data Urban fieldwork: enquiry questions and methods Urban fieldwork: secondary data sources Rural fieldwork: enquiry questions and methods Rural fieldwork: secondary data sources The enquiry process: asking questions and choosing methods The enquiry process: presenting, analysing and concluding The enquiry process: evaluating fieldwork

Geographical Investigations − UK Challenges

Topic overview The UK’s resource consumption and sustainability challenge The UK’s settlement, population and economic challenges The UK’s landscape challenges: National Parks and flood risk The UK’s climate change challenges

Geographical Skills

Topic overview Atlas and map skills: distributions, patterns and sketch maps Describing the site, situation and shape of settlements Interpreting diagrams, sketches and photographs Using online census sources Hypotheses, sampling and risk assessment Collecting, recording and presenting data Writing about findings and building an argument

Glaciated Upland Landscapes and ProcessesLandscape option

Topic overview Glacial processes and the processes at work on relict landscapes today Past climate and present UK weather in glaciated uplands Glacial landforms of erosion and deposition Crag and tail, and drumlins Human activity and development in glaciated uplands A named distinctive glaciated upland landscape in the UK

Global Development

Topic overview Defining and measuring development The global pattern of development and why it is uneven The consequences of uneven development for quality of life Strategies to reduce uneven development: aid, top-down and bottom-up The chosen country: location, context and internal unevenness Economic change, trade, aid and investment in the chosen country Population and social change in the chosen country Geopolitics and technology in the chosen country The impacts of rapid development and how they are managed

Mathematics and Statistics Skills

Topic overview Cartographic skills: contours, transects, scale and distance Using GIS and geo-spatial data Choosing, constructing and interpreting graphs and charts Numerical skills: number, scale, proportion and ratio Drawing conclusions from numerical data Statistical skills: averages, spread, percentages and correlation Spotting weaknesses in how data is presented

Resource Management

Topic overview What natural resources are, and how people exploit them How exploitation changes environments The distribution and consumption of food, energy and water

River Landscapes and ProcessesLandscape option

Topic overview River processes: weathering, mass movement, erosion, transport and deposition The long profile of a river and the effect of UK weather River landforms from source to mouth Land use, flood risk and river defences A named distinctive river landscape in the UK

The Changing Landscapes of the UK

Topic overview The UK’s rock types and geology How the UK’s upland and lowland landscapes were formed

Water Resource ManagementResource option

Topic overview The global distribution of fresh water, and water surplus and deficit Changing water supply and demand How water use differs between countries Water supply problems in the UK and in developing countries Stakeholder attitudes to water, and desalination Sustainable management of water resources

Weather Hazards and Climate Change

Topic overview Global atmospheric circulation and the transfer of heat Natural climate change and the evidence for it The enhanced greenhouse effect and the effects of climate change The climate of the UK and how it varies How tropical cyclones form, and where they occur Why tropical cyclones are hazardous, and their impacts Responses to tropical cyclones The causes of drought and why some places are more vulnerable The impacts of drought and responses to it

Ecosystems, Biodiversity and Management

Rainforest biodiversity and plant and animal adaptations

3 things to know
Paper 1

Overview

Why rainforests hold so many species, stratification and the niches it creates, tall trunks, buttress roots, drip tips, lianas and epiphytes, and how strong limbs, specialised wings and beaks and camouflage adapt rainforest animals.

What you need to know

Answer each one before you reveal it.

Your recallNot started

Key term

Why does the tropical rainforest hold more species than any other land ecosystem?

Key term

How does the layering of the forest raise the number of species it holds?

Key term

What is meant by stratification in a rainforest?

Questions from this subtopic

Each one with the model answer underneath.

1
Why does the tropical rainforest hold more species than any other land ecosystem?
Model answer
Constant warmth, water and sunlight allow growth all year, and the forest has been stable for millions of years, so huge numbers of specialised species have evolved.
2
How does the layering of the forest raise the number of species it holds?
Model answer
Each level offers different light, humidity and food, creating many separate niches so species can live above one another without competing directly.
3
What is meant by stratification in a rainforest?
Model answer
The arrangement of the vegetation into distinct horizontal layers of different height, each suited to the amount of light that reaches it.
4
Why do rainforest trees grow tall straight trunks with branches only at the top?
Model answer
Because light is only available above the shade of their neighbours, so they invest in height and put out leaves where the sunlight actually is.
5
What are buttress roots and what job do they do?
Model answer
Wide wing-like roots flaring from the base of a tall trunk, which brace the tree because its shallow roots in a thin soil give it very little anchorage.
6
What is a drip tip and why is it an advantage?
Model answer
A pointed leaf end that lets heavy rain run off quickly, so water does not lie on the leaf and allow algae or fungi to grow on it.

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Changing Cities

Coastal Landscapes and Processes

Ecosystems, Biodiversity and Management

Energy Resource Management

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ALess reliable rainfall slows both growth and decay.

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