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B7 Ideas In Context June 2012
This is information that I expect will come up and we will need for the Ideas and Context in
Biology B7 June 2012. I cannot guarantee that I have included all the information needed, or
that the information listed below will be needed, but it will help with your general knowledge
anyway. Good luck!
Encarta Dictionary definition-
"Biodiversity is the range of organisms, present in a particular ecological
community or system. It can be measured by the numbers and types of different
species, or the genetic variations within and between species."
In simpler terms, biodiversity is the "great variety of living things, both within a species and
between different species." (OCR BIOLOGY TEXTBOOK)
"Biodiversity is the range of species that occupy a habitat. It also means the range of
habitats." (Biology teacher)
So, when it says in the article that "...alien species..... are threatening biodiversity", it
basically means that organisms that are not from this habitat/area, and posing a threat on
other species who belong in this environment.
Officially, `Invasive species' means an "alien species whose introduction does or is likely to
cause economic or environmental harm or harm to human health". In other terms, it
basically means that it is a species that does not naturally occur in a specific area. Their
introduction may do, or perhaps already be causing harm to the environment, economic
system or human health.
An `Alien species' is one where, in respect to a particular ecosystem, its seeds, eggs, spores
or other biological matter has the ability to become widespread through reproduction, that
is not native (originally from) that ecosystem.
This is where one member of a species mates with a member of another species, resulting in
Encarta Dictionary Definition- "Interbreeding is to produce offspring by mating with a
member of a different breed or species, or mate an animal of one breed or species with one
Other pages in this set
Here's a taster:
These are species of animals which don't serve a purpose, other than to look nice.
What is `Biological Control'?
This is when a naturally occurring predator is used to kill a pest.
It should only affect one organism type that you targeted.
It should prevent poisonous chemicals being passed into food chains.
Encarta dictionary definition- It is "a method of reducing or eliminating plant pests by
introducing predators or microorganisms that attack the targeted pests but spare other
species in the area.…read more
Here's a taster:
Producing new species:
Many new features within plants and animals have appeared over thousands of years, and
these changes have been caused by `new genes' which are the result of existing genes that
have changed. These have been caused by mutations, which are usually due to outside
factors, such as radiation, or chemicals. They are also caused by mistakes made when genes
are copied during cell division.…read more
Here's a taster:
Humans and the Earth:
A lot of extinction is due to human activities, such as through deforestation, which causes many
organisms to lose their habitats. However, it can also be caused by humans indirectly- by indirectly
destroying an organism's habitat (e.g. the melting ice caps due to global warming and climate
change, caused by the excessive release of carbon dioxide in our atmosphere), or by introducing a
new species which it is unable to compete with.…read more