GCSE OCR 20th Century Science: Unit 4: Ideas in Context: To cull or not to cull? / Cleaning up the Marshall Islands / Call to ban food colourings

An easy revision guide for the GCSE Science Unit 4 Ideas Exam (June 2010). It analysis of the articles "To cull or not to cull?", "Cleaning up the Marshall Islands", "Call to ban food colourings" and some key terms. Enjoy and Good Luck.

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  • Created by: Ciaran
  • Created on: 27-05-10 18:20
Preview of GCSE OCR 20th Century Science: Unit 4: Ideas in Context: To cull or not to cull? / Cleaning up the Marshall Islands / Call to ban food colourings

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GCSE
By Ciaran O'Connell
[SCIENCE IDEAS PAPER CORE]
B2 ­ To cull or not to cull?, P3 ­ Cleaning up the Marshall Islands, C3 ­ Call to ban food
colourings

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Contents
B2: To cull or not to cull?
Key Terms
What you need to know
P3: Cleaning up the Marshall Islands
Key Terms
What you need to know
C3: Call to ban food colourings
Key Terms
What you need to know…read more

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B2: To cull or not to cull?
Key Terms
Tuberculosis (TB) ­ A potentially fatal contagious disease that can affect almost any part of
the body but is mainly an infection of the lungs. It is caused by a bacterial microorganism.
Antibiotics ­ Bacteria and fungi can be killed by chemicals (or drugs) called antibiotics.
Viruses cannot be killed by antibiotics.…read more

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What you need to know
1. Explain what TB is how it is caused
Tuberculosis is a disease caused by a bacterium.
2. Explain how TB is controlled in humans in the UK. And how this mechanism works in
our bodies to prevent us from getting TB
The discovery of antibiotics brought the disease under control within humans. Antibiotics destroy the
bacteria which causes Tuberculosis.
3.…read more

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Why do you think the scientists asked to investigate the question `Do badgers spread
TB in cattle?'
I think scientists asked to investigate this because the results would provide a clearer understanding
of whether or not the badgers spread TB in cattle. And by obtaining an answer to this question they
could then decide whether or not to cull badgers. This would also settle any dispute between
farmers and conversationalists.
8.…read more

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Did the study answer the question `Do badgers spread TB to cattle?' Explain your
answer
The results did not definitely prove that badgers spread TB to cattle. In fact, the incidence of Tb in
cattle increased in areas where badgers were culled.
13. How did the scientists interpret the data they collected from the study?
The fact the amount of TB in cattle increased in areas where badgers were culled has one possible
explanation.…read more

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Is the An opinion An A fact An
quote `an opinion opinion
opinion'
or `a fact'?
Analysis of The culling of This is a This is true, and I disagree
badgers is cruel theory which this can be proven with this
quote for ethical attempts to by the results of quote, as it
reasons. explain an the study.…read more

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Person Jane Ranjit Peter Stella…read more

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P3: Cleaning up the Marshall Islands
Key Terms
Nuclear Weapons ­
Fission ­ A fission reaction takes place in the nucleus of the atom and different elements
are formed. A neutron is absorbed by a large and unstable uranium nucleus. This splits the
nucleus into two, roughly equal-sized, smaller nuclei and releases energy and more
neutrons. A fission reaction releases far more energy than even the most exothermic
chemical reactions.…read more

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It emits this as gamma radiation, a very high frequency
electromagnetic radiation.
Ionising radiation ­ High-energy radiation capable of producing ionisation in substances
through which it passes, including alpha, beta and gamma.
Alpha radiation ( ) ­ Has a strong ionising power however is absorbed by a few
centimetres of air or a thin sheet of paper.
Beta radiation ( ) ­ Has a reasonable ionising power, it passes through air and paper but is
absorbed by a few millimetres of aluminium.…read more

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