OCR Gateway GCSE - Biology B2

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Mind Map by joshua6729, updated more than 1 year ago
joshua6729
Created by joshua6729 about 6 years ago
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Mind Map on OCR Gateway GCSE - Biology B2, created by joshua6729 on 05/18/2014.

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OCR Gateway GCSE - Biology B2
1 Classification and living together
1.1 Organisms are classified into discrete groups
1.2 Order of classification: Kingdom, Phylum, Class, Order, Family, Genus, Species
1.3 Organisms are classified using natural systems
1.3.1 This gives us information about evolutionary relationships
1.4 Similar organisms will compete with each other for food
2 Energy flow and recycling
2.1 Pyramids of biomass are harder to construct but always form pyramids
2.2 Pyramids of Biomass and numbers can show feeding relationships
2.3 Energy is lost from each stage of a food chain
2.4 Food chains are limited to a small number of trophic levels
2.5 Recycling of carbon involves: Photosynthesis, Feeding, respiration and decomposition
2.6 Recycling of nitrogen involves the action of four types of bacteria
3 Adaptation and natural selection
3.1 Heat loss from organisms depends on their surface area to volume ratio
3.2 Organisms in hot dry areas have adaptations to: increase heat loss, move on sand, cope with lack of water
3.3 Darwin's theory was first widely criticised but now is mostly accepted
3.4 Darwin's theory of natural selection involves variation, competition, survival of the fittest and selective reproduction
3.5 Examples of natural selection occurring today are: Warfarin resistance in rats, antibiotic resistant bacteria and frequency of colour in peppered moths
4 Population, pollution and sustainability
4.1 Human population has been increasing exponentially
4.1.1 This has led to: CO2 levels rising leading to Global warming, Sulfur dioxide causing acid rain and CFCs breaking down the ozone layer
4.2 Removing waste, producing food and supplying energy in a sustainable way will help to conserve habitats and organisms
4.3 Pollution can be measured using direct methods or by using indicator species
4.4 Conservation is important to: protect our food supply, prevent damage to food chains, protect organisms for medical uses and protect habitats for people to visit
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