A Species is a group of organisms that can breed together to produce fertile offspring
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1 ways a plant has adapted to their habitat
1) Cactus have extensive roots which ensures water is absorbed over a large area
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Which has the grater effect on a species - mutation in body cells or sex cells
Sex cells - it will be passed on to the offspring
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How does selective breeding differ from Natural selection
Natural selection = 'Survival of the fittest' Selective breeding is where human choose what gets selected
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How long ago did life begin on Earth?
About 3500 million years ago
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Explain how evolution could lead to the formation of a new species
Different mutations create new features in one group of the organism - Natural selection then kicks in
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How do fossils provide evidence that we evolved from simpler life forms?
Fossil records show species getting more complex as time goes on
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DNA evidence?
Scientists can use the similarities and differences in DNA to work out how life has evolved
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One reason why Lamarck's theory of evolution was rejected in favor of Darwin's theory
People concluded that acquired characteristics don't have a genetic basis
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What is Biodiversity?
1) The number of different species on earth 2) The range of different types of organisms on earth 3) The genetic variation between organism of the same species
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1 likely cause for increased rate of species extinction
Correlation between growth of world's population and number of species extinction
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1 reason why Scientist classify organisms
Shows us evolutionary relationships between different organisms
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What are the five different kingdoms?
Bacteria, Fungi, Algae, Plants, Animals
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Four factors that are essential for plants to live
Light, minerals, carbon dioxide, oxygen
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Explain why organisms have to compete for resources in their environment
If an essential factor in a habitat is in short supply, some organisms won't survive
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The 3 main reasons for a species becoming extinct?
1) Environmental conditions change 2) New species introduced 3) An organisms in the food web it relies on becomes extinct
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what is the source of all energy in a typical ecosystem?
The sun
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How is energy transferred between plants and animals?
Animals eat plants - animals eat animals - energy is lost at each stage - much of it is used for staying alive
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Ways that energy is lost at each stage of the food chain
Respiration, moving, reproducing, staying alive
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Why is it unusual to find a food chain with more than five stages
So much energy is lost that there is very little to support the organisms after 5 stages
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In the carbon cycle, how is carbon dioxide turned into carbon compounds?
Through photosynthesis
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How is carbon passed between animals in an ecosystem?
Animal eat animals
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Ways that carbon is released back into the air
1) Combustion 2) Respiration 3) Decomposition
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Non-living indicators of environmental change
-Temperature -Nitrate level -Carbon Dioxide level
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Living indicators of environmental change
-Lichen -phytoplankton -Mayfly Nymphs
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Define Sustainability
Meeting the needs of today's population without harming the environment so that future generations can still meet their own needs
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What is monoculture?
The cultivation of a single crop in a given area
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Other cards in this set
Card 2
Front
1 ways a plant has adapted to their habitat
Back
1) Cactus have extensive roots which ensures water is absorbed over a large area
Card 3
Front
Which has the grater effect on a species - mutation in body cells or sex cells
Back
Card 4
Front
How does selective breeding differ from Natural selection
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