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June 2010
-Science Exams-

Biology
~B1B~Evolution and Environment
Contents:
>>Adaptation for survival
>>Variation
>>Evolution
>>How people affect the planet

Biology
Adaptation for survival
-An adaptation is a feature that enables an organism to survive in its habitat
- Allows animals and plants to live and cope with their habitat in…

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>>food
>>mates
>>territory

*When resources are limited, only the best adapted organisms will survive

A Weed's Properties
-grows quickly and flowers twice a year
-Resistant to a lot of weed killers
-grows quickly on bare soil
-roots produce chemicals that stop other plants from growing
-has deep roots which are…

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Process of Dolly the sheep




>>Cloning
Now plants can be produced quickly and rather cheaply due to cuttings of older plants ­see GCSE purple
revision book. The plants produced from this have the same genetic information as the parent plant,
inheriting useful characteristics e.g. flower colour, scent and number of…

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>>Genetic Engineering
When the body cannot make a specific protein, a disease is often the result like diabetics cannot produce
sufficient amounts of insulin. Due to the genetic engineering, we can now make a lot of these proteins.
Genetic engineering means transferring genes from one type of cell to another…

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Process of Genetic Engineering




Evolution
>>Fossils

Fossils are the preserved remains of animals and plants from millions of years ago
Fossils are formed by:
~Due to the denser, harder parts of organisms not decaying [e.g. bones, teeth and scales] are instead
buried by sediment and are gradually transformed to rock.…

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-Exposure to ionising radiation [see Physics section] e.g. UV light, X-rays and radiation from radioactive
substances. The more intense the radiation, the greater the chance of mutation
- Certain chemicals can cause mutations
>>Evolution
*Evolution is the gradual change in the characteristics of a species over time.
Evolution is a…

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Quarries




Herbicides Pesticides

Land
Sewage

Water Fertiliser

Toxic chemicals
Air


Smoke Gases



>>Acid Rain

Burning fossil fuels may release sulphur dioxide & nitrogen oxides. These gases dissolve in rain making
it more acidic.

Acidic rain can: ~cause
trees to lose all their leaves ~increases acidic
pH of lakes and rivers…

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-causes carbon dioxide to be released to the atmosphere due to combustion and the action of microbes.
-Less trees available to absorb carbon dioxide and produce oxygen and therefore, less carbon dioxide is
removed from the atmosphere by photosynthesis.

>>Eutrophication

Results from too many fertilisers being washed from the soil…

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>>Sample Question time!!!!!! That's not too exciting but... I don't know...

This question considers adaptation. Okay, so what if I'm doing multiple choices? This thing will help me
for sure! I think.

The vole is a small mouse like animal. Voles found on some cold islands to the North of…

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Who tells you that you have the right to cheat? Nonsense what cheek! You even look for a
flicker and well, I can definitely not do something about it!!!

Adaptation and Competition

1. Name 3 physical factors that affect organisms.
2. Why do polar bears have a thick coat and…

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