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